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how to flush cannabis in soil before harvest

How and When to Flush Marijuana Plants

Flushing the marijuana plants before harvest can make all the difference in the best bud, or horrible hash. This small task is simple and super easy to do. Just add water! Be very careful, as the timing of the flush can play a critical role in this process.

The what, how, and why of flushing cannabis plants.

  • 1. What is flushing?
  • 2. The best time to flush your cannabis
  • 3. Prevent nutrient lockout before it becomes an issue
  • 4. Enzymes to the rescue
  • 5. How to properly flush cannabis
  • 6. How to flush hydroponic plants
  • 7. The outcome of flushing your cannabis
  • 8. When to avoid flushing your plants
  • 1. What is flushing?
  • 2. The best time to flush your cannabis
  • 3. Prevent nutrient lockout before it becomes an issue
  • 4. Enzymes to the rescue
  • 5. How to properly flush cannabis
  • 6. How to flush hydroponic plants
  • 7. The outcome of flushing your cannabis
  • 8. When to avoid flushing your plants

You have finally finished your grow, ending up with a beautiful plant covered in tremendous bud, now dried, cured and ready to go – yet something is not quite right. You can hardly get the stuff to burn, and when you take a hit, it feels like a mule kicked your lungs as you end up coughing for your life! The taste is harsh and disappointing. If this is a situation you have experienced, chances are your plants were not flushed properly before harvest.

This less than pleasant smoke is caused by nutrients and minerals used during growth still be present in the plant, altering the way it burns. Flushing removes these remaining nutrients, improving the quality of the experience. Fortunately, flushing your cannabis is an effortless and easy task, and will have you producing smooth and delightful bud in no time.

WHAT IS FLUSHING?

The act of flushing a plant is using plain water to actively remove any nutrients in the soil. A large amount of water is passed through the soil and drained away on a regular basis. Any minerals and nutrients present in the soil are washed away over time by the water, leaving the soil clean.

Why would you want to strip away all the minerals from the soil? Isn’t this hurting your harvest? It actually helps your harvest a significant way. When the nutrients are removed from the soil, it forces your cannabis plant to use up any remaining nutrients still present in the plant. It is a lot like the human body. We take in a lot of food and, what we do not use is turned into fat. In extreme situations where food is scarce, the body relies on this stored fat for energy.

As flushing forces cannabis to use up any remaining nutrients left in the plant, none should remain to taint the use of the harvest bud. However, if done to early, it can leave your plant unhealthy, so timing is key.

THE BEST TIME TO FLUSH YOUR CANNABIS

Flushing is usually commenced two weeks before harvest. If the plant has an eight-week flowering period, the flushing will need to take place six weeks after the start of the flowering stage. It is best to take a close look at the trichomes on your plant to assess when your cannabis is likely to be ready for harvest. If the tiny trichomes are just beginning to turn from clear, to a cloudy and milky colour, this could be a good indication that the plant can begin flushing. It should be timed so that the majority of trichomes will have fully changed to the desired colour for harvest after two weeks – this gets easier with experience, so stick with it!

Flushing can also be a good way to reset the soil while a plant is in the vegetative state. Sometime, growers will accidently overfeed their cannabis, causing the tips of the leaves to begin changing colour and shriveling. This is called “nutrient burn”. Flushing the soil can remove the excess nutrients, helping avert the problem. However, it is a drastic measure at this phase of growth, so be sure that the problem is nutrient burn, and not something else first.

Flushing isn’t exclusive to harvest time. The technique can also be used in the vegetative phase to remove excess nutrients from the soil. Sure, nutrients keep your plant healthy and ensure optimal yields, but too much can cause nutrient lockout—a state where plants can’t access nutrients.

Nutrient lockout can be caused by both salt buildup and incorrect pH levels. It can be solved by flushing affected plants with plain water. The fluids push nutrients out of the soil and wash away the buildup, allowing roots to once again freely uptake nutrients.

PREVENT NUTRIENT LOCKOUT BEFORE IT BECOMES AN ISSUE

Nutrient lockout can be an inconvenience at best and devastating at worst. As the old saying goes, prevention is better than a cure. It’s best to take steps to avoid nutrient lockout as opposed to tackling it later down the line.

Preventing nutrient lockout can be accomplished via routine flushing. By flushing your plants once before flowering begins and once halfway through flowering, you’ll minimise the chances of nutrient buildup.

ENZYMES TO THE RESCUE

After flushing to counter nutrient lockout or before harvest, you might still notice your plants are dark green in appearance—a sign of excess nutrients. In this case, some growers elect to add enzyme-rich formulas to the soil.

If you don’t remember anything from biology class, enzymes are proteins that catalyse reactions. They help to flush out the soil by breaking down starches, carbohydrates, and nutrients. There’s a variety of products on the market that contain effective enzyme formulas.

If water isn’t doing it for your plants, these small proteins will make lingering nutrients budge!

HOW TO PROPERLY FLUSH CANNABIS

Flushing your cannabis plants is a straight forward process. Whenever you would normally feed, you flush instead. Untreated tap water is all you need to use for flushing, just be sure to make sure the pH is at a safe level for cannabis. Most well water contains a healthy pH level and will not need treatment, but if it is necessary for you to add treatment to adjust the pH of your flushing water, feel free to do so. The pH adjustments will be the only thing you will need to be concerned about.

Flood the soil with as much fresh water as it can hold. Leave this for a few minutes to allow all of the nutrients to be picked up, the flood the soil again to flush it all away from the plant. If you are indoors using pots, notice the colour of the water that is draining from the bottom of the pot. It will be stained and look dirty. This is where a TDS (total dissolved solids) meter will come in handy. If you were to collect and measure the TDS of the “drained off” water, it would be around the measurement of 1300ppm, which is pretty high. It is important to keep flushing the plant until this number drops to a level of 50ppm, or at least until it is close to matching the TDS of the fresh water that you are using to flush with. The colour of the draining water will lighten up and appear to be cleaner. You want to get as much of the dissolved minerals away from the plant as you can.

HOW TO FLUSH HYDROPONIC PLANTS

Flushing hydroponic plants is much easier than removing nutrients from a soil medium. Hydro growers can simply drain their system and replace the water with plain pH-balanced water instead.

Flushing hydroponic plants is also a much shorter process. Once the water supply has been switched out, hydro plants won’t have access to any external nutrients. Because of this, you’ll only need to flush plants for two days.

THE OUTCOME OF FLUSHING YOUR CANNABIS

After the bud is harvested, take the extra time to cure the bud to its highest potential. A proper cure will cut back even further on that harsh edge, removing aspects like excess chlorophyll. You will be amazed at the difference this small effort can do to your product. All of your hard work will show in that first inhale of that silky smooth smoke that hits the back of your throat as soft as honey. This is nature at its smoothest. You can increase the quality of your cannabis by just adding water!

WHEN TO AVOID FLUSHING YOUR PLANTS

The only time it’s recommended to avoid flushing is when you’re growing in an amended organic soil or super soil. This medium is carefully developed over time to harbour beneficial microorganisms such as bacteria and fungi. This delicate biodiversity can be washed away and damaged by flushing.

Then again, the lack of flushing shouldn’t be an issue as no synthetic or external nutrients are added to this medium. Instead, plants rely on microorganisms to break down organic matter and deliver it to the roots.

The HI-98107 pHep pH tester provides fast and accurate pH readings. The easy-to-use device is designed for non-technical users, and can help both novice and advanced growers measure water pH.

HI-98107 pHep pH tester provides fast and accurate pH readings. The easy-to-use device is designed for non-technical users, and can help both novice and advanced growers measure water pH.

Flushing cannabis before harvest can makes the difference between a smooth or horrifically harsh smoke. Here is how to do it.

Flushing Cannabis Before Harvest (for Smoother Buds)

Table of Contents

This flushing tutorial is part of our “how to harvest cannabis” series:

What is the Point of Flushing Before Harvest? (Leaching Extra Nutrients Out of Buds)

Flushing is free and easy technique that may improve the quality and smoothness of your cannabis buds before harvest. Sounds good, right? Of course it does! But growers must also be careful with flushing before harvest because if you do it too early you can actually hurt your quality (and reduce your yields)!

The process of flushing involves giving your plants just plain water with no nutrients for a period of time before harvest. For growers who normally give water to their plants with nutrients in it, you would water your plants as normal with the same type of water you normally use, but you don’t add any nutrients. Depending on the setup, growers usually flush their plants this way for a few days up to about 2 weeks.

Note: You still need to pH the water during the flush, because too high or too low pH can cause your plant to absorb extra aluminum and salt out of the water!

Flushing Before Harvest – Quick Summary

1.) Wait until harvest window is almost open (how do I know when plants are close to harvest?)

How long should each type of grower flush their plants before harvest?

  • Amended Soil Growers: Don’t flush
  • Soil Growers: Flush 1-2+ Weeks
  • Coco Growers Flush: 5-7 Days
  • DWC/Hydro Growers: Flush for a Few Days

More info about each one in the full tutorial below!

2.) Water plants as normal, except with no nutrients or supplements

You’re going to do everything you normally do when it comes to watering, except without any additional nutrients or supplements. Don’t give more water at a time than normal, because this increases the chances of your plants getting overwatered and showing deficiencies / symptoms caused by that problem.

3.) Watch plants closely for signs of too much yellowing

During the flush before harvest, your plant can lose its green color very quickly. Although it’s normal to see some amount of yellowing before harvest, it’s important to harvest before the sugar leaves on the buds themselves have turned yellow. Although this doesn’t affect the quality of the buds, it does affect the appearance and buds aren’t as pretty. Additionally, once all the leaves have turned yellow your plant won’t really mature a whole lot more, and buds can start to deteriorate quickly.

4.) Harvest Your Plants

After the flushing period, your plants should appear a lot lighter than they did at the beginning. It’s time to harvest! Learn more about when and how to harvest plants.

That’s pretty much it! Read on to get the complete tutorial with more detailed step-by-step instructions!

The idea behind flushing is to let your cannabis plants “use up” any extra nutrients contained in the plant and buds. This way there is a much lower level of nutrients left over after harvest, and it’s those extra nutrients that can change the smell, taste or (most often) “smoothness” of your buds in a negative way.

So in soil or coco coir, the grower would give the plant just plain water for days or weeks before harvest time. This lets the plant use up the nutrients in the soil/coco, and then – theoretically – start leaching extra nutrients from the buds.

In a hydro or DWC setup, flushing is even easier. The grower simply replaces all the water in their reservoir with plain pH’ed water, and the plant doesn’t have access to any nutrients available except for what’s already in the plant.

Flushing is Giving Plants Only Plain Water For Days or Weeks Before Harvest

Is Flushing Important?

There are a million opinions about flushing. When I first started growing, I always flushed based on the habits I’d learned from other growers. Yet sometimes I’d skip it altogether. One of the most common reasons growers tell you to flush is that not doing so affects flavor. After flushing and not flushing, I personally couldn’t tell any difference when it came to smell or flavor.

In fact, I got lots of compliments on the taste and flavor of my buds. My unflushed buds didn’t have a “chemical” taste like others had warned of, and I figured the need to flush was basically a growing myth, or something growers should only do if they’ve given their plant too many nutrients.

One time we decided to do a test. We harvested some buds and then started flushing. I harvested the rest of the buds post-flush. It’s not a perfect experiment since the buds were harvested at different times, but flushing didn’t seem to have an effect on enhancing flavor or smell.

It could be that we always nutrient levels on the low side throughout the entire flowering stage, without any supplements. Perhaps maintaining lower levels prevents any type of nutrient buildup (so to speak) in the buds. It’s possible that the flushed buds were a little smoother to smoke, but it’s hard to say.

So does that prove anything? No. It could be helpful, but I wouldn’t worry too much about it if you forget. On the other hand, there doesn’t seem to be any true downside as long as you don’t start flushing too early. Because of that, I recommend every grower try it for themselves to see what they think!

How to Flush Your Cannabis Plants Before Harvest – Complete Tutorial

1.) Wait until plant already looks like it’s at the early end of the harvest window – in other words, wait to start the flush until you could pretty much harvest the buds right now if you wanted

At the beginning of the harvest window, your buds should already look just about the way you want them to at harvest. When are my plants ready to harvest? This harvest window lasts for several weeks because marijuana buds don’t get “overripe” easily, and you have plenty of time to harvest your buds even two weeks after they’ve reached the beginning of the harvest window.

At this point it would be like harvesting fruit a little early; they won’t be at full potential, but they’ll still be pretty good, so it’s a great time to start the flush now so you harvest at the optimum time. On the flip side, if you start flushing when your buds “seem” two weeks away, instead of already being in the harvest window, chances are you will be starting the flush too early and end up with “underripe” buds (and smaller yields).

Why avoid flushing buds early? You can read the full explanation here, but basically buds harvested on the early side tend to be more “racing” or possibly have a paranoia-inducing effect, while waiting longer to harvest increases THC levels and intensifies the psychoactive properties of your buds. Waiting even longer makes buds that are still potent and psychoactive, but the extra time in the flowering stage also starts to add a more relaxed,”couchlock” effect as some of the THC degrades to CBN.

At the earliest part of the harvest window, at least 40-50% of the white hairs have darkened and curled in. If you look at buds under a magnifier, you’ll see that the mushroom-like trichomes (which were once clear) are at least half cloudy.

A little extra info on harvest time: Cloudy trichomes indicate the highest levels of THC. When half of the trichomes are cloudy it signals the very beginning of the harvest window (the earliest it’s ever recommended to harvest buds). For the most part, a cannabis plant won’t reach the very beginning of its harvest window until 6-8 weeks into the flowering stage, and that’s still several weeks earlier than many strains.

Although buds can be harvested at this point, they will continue to develop and increase THC levels over the next few weeks as more trichomes turn cloudy. Your yields will also increase significantly! If you’re looking for a more relaxed effect, I recommend starting the flush when just about all the trichomes have already turned cloudy.

Harvesting on time gives more potent results and bigger yields than harvesting early, so it’s imperative to avoid flushing too early!

The harvest window lasts for a few weeks and with this method your buds will still be ready to harvest at the end of the flush, without the chance of having started too early.

2.) Provide only plain pH’ed water to plant until harvest (from a few days to 2+ weeks)

You’re going to do everything you normally do when it comes to watering, except without any additional nutrients or supplements. Don’t give more water at a time than normal, because this increases the chances of your plants getting overwatered and showing deficiencies/symptoms caused by that problem.

Soil Growers Flush 1-2+ Weeks – Soil growers should flush the longest, from 1-2 weeks. This is because there is still some amount of nutrients left in the soil. For super soil growers who haven’t used any nutrients from seed to harvest, you don’t have to worry about flushing because you’ve been giving plain water from the beginning. Your microorganisms in the soil have fed nutrients directly to your plants as needed, and it’s very unlikely you have any type of nutrient build-up.

Coco Growers Flush

1 Week – Coco coir does not hold onto a lot of extra nutrients and just a watering or two with plain water will wash most nutrients away. Therefore growers utilizing coco coir should only flush their plants from a few days to about a week, depending on how fast the plant is turning yellow.

DWC/Hydro Growers Flush for a Few Days – When a hydro/DWC grower changes their reservoir to plain water, their plants literally have access to almost zero nutrients immediately. Because of that, a hydro grower should usually only flush their plant for a few days before harvest to prevent early yellowing.

Exceptions to the “No Supplements” rule:

  • Beneficial root bacteria – Hydroponic growers should continue using products with beneficial root bacteria like Hydroguard right up until harvest. These products do not contain any nutrients but will protect your plants from root rot.
  • Continue to manage the pH of your water as normal – PH Up and Down products don’t contain added nutrients. If the pH is too high or too low, it makes certain types of salts and aluminum more available to your plant roots. You don’t want your plant absorbing that stuff up right when you’re trying to flush the buds!
  • Blackstrap molasses – This all-natural bud sweetener is safe to use up until harvest in coco or soil grows (1/2 tsp per gallon of water), but not in hydro.
  • “Clearing” or “Salt Leaching” Solutions (below) – These supplements have been specifically designed to help remove extra nutrients during the flush.

Even during the flush, it’s still important to manage your pH. Many growers agree that a few days to 2 weeks is a good amount of time to flush. Plants in soilless mediums like coco or hydro can’t be flushed as long as plants in soil because they will run out of nutrients too quickly. For hydro you may only be able to flush for a few days. Flushing too long or starting too early increases the chances of reducing yields and running into unpleasant looking nutrient deficiencies.

“Clearing” or “Salt Leaching” Solutions

These products are formulated to help remove extra minerals or salts when flushing the plant, which may reduce the chance that these leftover minerals or salts end up altering the smell or flavor of your buds.

They’re meant to be used if you’ve been giving your plants extra nutrients in their water. They aren’t necessary when the plant has been getting all its nutrients from the soil.

  • FloraKleen (by General Hydroponics)
  • Clearex (by Botanicare)

3.) Watch out for early yellowing

During the flush before harvest, it’s important to keep a close eye on your plants. Your plant can turn yellow almost over night in certain situations.

Although it’s normal to see some amount of yellowing before harvest, it’s important to harvest before the sugar leaves on the buds have turned yellow.

Try to harvest before the green sugar leaves (small single-finger leaves directly attached to buds) start turning yellow. In the following cases, many of the fan leaves have turned yellow during the flush, but the small leaves on the buds themselves still appear green. They are at the perfect time to harvest!

You can see the sugar leaves are mostly still green, but many of the fan leaves are pale and turning yellow. That is what you’re looking for.

This auto-flowering plant is ready to harvest, too! If you wait any longer the yellowing may spread to the buds.

If the leaves of your plant have turned completely another color like red or purple, that is also a sign the end is near (not talking about when the buds themselves turn pink or purple, as that’s caused by a different genetic trait and doesn’t have anything to do with the leaves). Even for plants where leaves changing colors is normal, it usually only happens when harvest time is coming soon.

Your plant can’t really make energy from light after the leaves stop being green. That means you should plan on harvesting within a week of leaves going completely purple, and possibly even sooner if the buds themselves start looking discolored. In the following picture the buds continue to look pristine so far, but the purple leaves are a sign that the grower should plan to harvest soon to avoid letting the buds themselves get discolored or crispy.

Try to harvest your buds before the sugar leaves and/or the buds themselves actually start turning yellow, or buds appear burnt

Although discolored sugar leaves doesn’t affect the quality/potency of the buds, it does affect the appearance (your buds won’t be as pretty). Additionally, once all the leaves are yellow your buds won’t really mature a whole lot more, and buds can quickly further deteriorate in health and lose potency.

That being said, even if buds don’t look picture perfect, they will be just as great to smoke, and some growers prefer the more “couchlock” style effects of buds that have been allowed to mature on the longer side! Learn more about how harvesting at different times changes the potency/effects.

If you let the flush go this long, where buds are getting crispy and brown without any sign of green, it means the actual potency of your bud is starting to degrade. This bud needs to be harvested immediately so you don’t lose further potency!

4.) Enjoy your smooth and potent buds!

Woo hoo! You’ve been working so hard, and now you are almost at the end of your journey!

You’ve done everything you could to ensure the smoothest buds, so now it’s time to enjoy the fruits of your labor!

Flushing Tips – Don’t Make These Common Mistakes!

Flushing Too Early

The biggest problem with flushing, especially for new growers, is to start the flush too early. New growers commonly think their plant is just a week or two from harvest, when truthfully it’s 4 weeks or more away from the optimal harvest time. Breeders often understate the length of the flowering stage for strains, giving the timeline for the absolute earliest harvest, so it’s generally a good idea to add an extra two weeks (minimum) to their recommended time for a more realistic estimate of the optimum time to harvest.

When you flush a cannabis plant too early, you’re stunting its growth because buds aren’t getting enough nutrients to develop properly. Without being given the right amount of nutrients during the most crucial parts of the flowering stage, the potency, quality and weight of your buds can also be lower.

Problems with Flushing Too Early

Growth is stunted during the most important parts of the flowering stage, and yields are reduced.

Potency may be lower because buds didn’t have the nutrients needed to develop THC properly, and if buds are also harvested early it reduces the potency even further!

The appearance of buds can be affected, as a plant left too long without nutrients starts developing nutrient deficiencies that can spread to the sugar leaves on your buds, causing unsightly yellow leaves. Although this doesn’t negatively affect how the bud smokes, taking care of your sugar leaves until harvest is very important to get the best-looking buds (this is also another reason why it’s important to avoid too much nutrient burn)

Flushing too early or too long can hurt the looks of your buds because it can cause the sugar leaves start turning yellow!

All the nutrients were used up in the plant, including the ones in the sugar leaves, causing unsightly yellowing on the buds/sugar leaves that’s almost impossible to trim off.

Allowing this to happen gives you buds covered with little yellow parts where the base of the leaves were, before they got trimmed.

Example – After the bud was trimmed and dried, there are still yellow spots from the base of each sugar leaf that turned yellow, making buds look lower quality than they are!

This example shows a normal bud where sugar leaves remained green at harvest, no yellow spots

The bud which didn’t have yellowing has an overall higher quality appearance – more evidence that it’s so important to time your flush right!

I’ve seen so many growers finish their two-week flush, and realize their plant still has several weeks to go after the flush is over. Do they continue flushing, do they start using nutrients again, or do they just harvest the plant early? It’s hard to say which way is best in a situation like that.

So when it comes to flushing, I personally believe in waiting to flush until the harvest window has just opened. What that means is I won’t start flushing until the buds can already be harvested now, even if it’s a bit too early for my preference.

Once the buds have hit the very beginning of the harvest window (trichomes are at least half-clear, half cloudy – learn more about trichomes and when to harvest), they still usually have 3+ weeks before the plant reaches the end of the harvest window. I personally like to harvest plants a little on the later side, because THC levels are higher, buds are bigger, and effects tend to be more relaxing and not “racing”. So starting the flush at the very beginning of the harvest window allows you to time your harvest perfectly for a 2-week flush.

You won’t be able to flush too early if you follow this principle! If your plant still looks like it’s a few weeks away from harvest, wait! You never know how the plant is going to mature, and you can’t be sure that harvest time is close, until the harvest window has actually opened.

Not pH’ing Your Water During Flush

Another common problem growers have is they stop maintaining pH when they start the flush. Even during the flush it’s important to maintain pH at the roots to make sure your plant can properly use the nutrients available. It can help prevent yellowing and spots on the leaves during the flush; when the pH is too high or too low at the plant roots, it makes certain nutrients unavailable to the plant and increases the chance of seeing nutrient deficiencies. The plant also tends to absorb more aluminum and salts out of the water when the pH isn’t in the correct range.

Maintaining pH throughout the flush will help prevent deficiencies and unwanted salt absorption, while still allowing your plant to use up its extra reserves of nutrients in the buds!

How Long To Flush?

It’s generally recommended to flush plants for a few days to 2 weeks. I think this is a pretty good standard to go by. Unless you’re growing in amended super soil, flushing for longer than 2 weeks without nutrients is likely to stunt growth of the buds, which we don’t want in the flowering stage!

Many growers agree that a few days to 2 weeks is a good amount of time to flush

Soil Growers Flush 1-2+ Weeks – Soil growers should flush the longest, from 1-2 weeks. This is because there is still some amount of nutrients left in the soil. For super soil growers who haven’t used any nutrients from seed to harvest, you don’t have to worry about flushing because you’ve been giving plain water from the beginning. Your microorganisms in the soil have fed nutrients directly to your plants as needed, and it’s very unlikely you have any type of nutrient build-up.

Coco Growers Flush

1 Week – Coco coir does not hold onto a lot of extra nutrients and just a watering or two with plain water will wash most nutrients away. Therefore growers utilizing coco coir should only flush their plants from a few days to about a week, depending on how fast the plant is turning yellow.

DWC/Hydro Growers Flush for a Few Days – When a hydro/DWC grower changes their reservoir to plain water, their plants literally have access to almost zero nutrients immediately. Because of that, a hydro grower should usually only flush their plant for a few days before harvest to prevent early yellowing.

Who Doesn’t Need to Flush?

I believe a flush is very important for all growers using liquid or powder nutrients.

Perhaps the exception to flushing would be soil growers where the plants are getting their nutrients primarily from the soil instead getting it directly in their water. When growers provide nutrients in the water (with liquid or powder nutrients) they’re giving nutrients in the most accessible form possible, and the plant uptakes those nutrients immediately, whether it needs them or not.

This is the type of situation where you want to leach out extra nutrients that the plant may have absorbed into the plant matter.

You only need to flush if you’ve been using powder or liquid nutrients! If you’ve been growing in straight soil without nutrients then flushing isn’t necessary.

In a composted soil environment, the nutrients are being broken down at the roots gradually in the soil, making it difficult for a cannabis plant to take in more than it needs!

Plus it makes sense that growers who have only been providing water to their plants the whole grow don’t have any need to flush – what would they do different anyway?

There’s no truly definitive answers when it comes to flushing. No one has done the type of vigorous controlled experiments it would take to be able to say with authority the exact best way and time to flush, what the exact effects will be or if it’s even worth it in the first place.

But in my experiments, flushing for at least a few days up to 2 weeks before harvest seems to make for the smoothest buds without any downsides!

Flushing before harvest can increase the quality of your buds, but it can also hurt your yields and even REDUCE the quality of your buds if you do it too early! Learn how to flush properly!