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Should I Defoliate My Cannabis Plants?

defoliation during flowering

We all need a haircut sometimes. The same is true of cannabis plants. If you leave a plant to its own devices, it’ll grow more leaves and branches than it needs. While it may seem counter-intuitive, sometimes removing leaves and branches can actually boost the yield of your plants. This technique, called defoliation, is a high-risk, high-reward option for experienced cannabis growers.

Defoliation – What Is It?

Defoliation, also called deleafing, involves removing parts of a cannabis plant in order to encourage new growth. In some professional grows in legal states, employees will spend their entire days defoliating a garden. However, this can be a fairly polarizing technique – some growers love it, others loathe it. Detractors say that it’s a waste of time and can actually hurt your plants. However, when used correctly, defoliation can help you boost your yield, prevent disease and grow better quality cannabis – we’ll tell you how.

Why Is Defoliation Helpful?

marijuana defoliation

Removing plant matter can have several positive effects on a cannabis garden. First, it will help plants focus their energy on new growth. Second, defoliation allows more light to penetrate your canopy. Third, it promotes airflow and prevents disease.

Defoliation During The Vegetative Stage

You should do most of your defoliation during your plant’s vegetative cycle. When a plant is vegging, it’s young and robust, and therefore has the stamina it needs to overcome stressful situations like defoliation. As a result, defoliating during veg will ensure that your plants have time to recover before you switch them into flower. In addition, defoliation will improve airflow and light penetration in your garden. These changes affect the overall health of a plant. By defoliating early, you can prevent a slew of diseases and infestations from taking root that might otherwise rear their ugly heads during the flowering phase.

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Defoliation During The Flowering Stage

You’re not done yet! Defoliating during flowering is just as important as it is during veg. Defoliation changes the way in which plants grow by causing them to release growth hormones. Instead of using energy to create leaves, that power will go into forming large, dense buds. In addition, defoliation during flowering serves the same purposes as it does during veg: ensuring that your plant gets proper light penetration and airflow. You can actually see the difference between buds that received direct light during flowering and ones that didn’t. Buds in direct light will be a healthier shade of green, while those in shade will have a lime-green color.

But Wait – Isn’t Defoliation Risky?

deleafing autoflowers

There are plenty of growers who denounce defoliation as being a risky maneuver. They’re not wrong. If you don’t know what you’re doing, you can cause serious damage to your garden. One common mistake inexperienced growers often make is defoliating too much of their plants. While removing some plant matter can kickstart your plant and improve its health, defoliating too much can have the opposite effect. If you remove too many bud sites early in your plant’s lifecycle, you may end up with reduced yields. In addition, defoliating plants that are already unhealthy can cause their health to deteriorate even further. Removing plant matter is stressful for cannabis, and if you remove too much, you may cause the plant to herm. Once that happens, it won’t produce any more THC. However, if you’re careful, you can successfully defoliate without triggering any of these problems. Keep on reading to find out when and how to defoliate properly causing the least amount of stress for your plant.

Defoliation During Veg – Best Practices

deleafing cannabis plants

Before you start defoliating, you need to know how to do so properly. You can’t just go cutting off parts of your plant willy-nilly. Instead, you should approach marijuana defoliation systematically. Knowing when to remove plant matter and how much to defoliate are the two keys to success. With a little practice, this will become second nature.

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When Should I Start?

You can start defoliation as soon as your plant has taken root. Before you try though, you should give your plant a checkup to make sure it’s already healthy – defoliating a sick plant can quickly turn it into a dead plant. In addition, ensure that your plant has been watered recently. It’ll need as much energy as it can get to heal itself after defoliation. A common practice is to remove the lower branches a few days before you switch your plants from veg into flower. Wait a day or two, then flip into flower.

What Should I Cut Off?

effects of defoliation on plants

The whole point of defoliating in veg is to set your plants up for success in their flowering stage. The first thing you’ll want to do is remove the plant’s lower branches. Anything that touches the surface of your medium needs to go. After that, you can remove any branches that don’t reach up into your canopy. These low-hanging nodes will never receive the light they need to fully mature. Instead, they’ll only drain energy from your plant. Don’t let that happen – cut them off, don’t be shy! You want to remove the branches from the bottom 20% of the plant. Some growers call this technique “lollipopping”. Once you have a nice, defined canopy, you can work on removing leaves. Get rid of any leaves that are blocking nodes from direct light. Don’t overdo it, though! Leaves are like little solar panels for cannabis plants and help produce energy. You’ll want to make sure that your plants still have some leaves to help power their growth.

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Defoliation During Flower – Doing It Right

weed defoliation

Even after your plant enters the flower cycle, removing leaves can be beneficial. While defoliating in veg is a great way to boost your plant’s growth, doing it during flowering is a way to maintain bud quality. Defoliating during this stage will help you reduce larf (low-hanging fluffy buds that aren’t viable) and improve yields. Defoliation is also helpful for autoflower strains, as time is such a crucial resource with these plants.

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When Should I Start?

Once in the flowering cycle, you’ll need to stick to a schedule. This timetable will maximize the benefits defoliation has on your plants. Once your plants are three weeks into flower, perform another defoliation. At this point, focus only on leaves, not bud sites. This will likely be your last major deleafing in the plant’s life cycle. From now on, you should only remove leaves if they’re directly covering buds or nodes. Make sure that your nugs are in direct light!

What Should I Cut Off?

When defoliating in the flower phase, keep lollipopping to a minimum. At this point, you don’t want to remove any bud sites. Instead, focus on removing fan leaves (leaves attached to the plant with a long stem). If a fan leaf is covering a bud site, cut it off to ensure proper light penetration through your canopy. There are two techniques you can use when removing leaves. First, you can cut the leaf off with pruning shears. Make sure to cut the leaf as close to the plant’s main stem as possible. In contrast, you can simply pull the leaf downwards to remove it. It’ll detach from the main stalk with a satisfying pop. These two techniques help minimize the possibility of infections getting into your plant during defoliation.

How To Tell If Defoliation Was Successful

autoflower defoliation

After you defoliate your plants, you may notice the tips of your leaves turning neon green. This happens when a plant’s nutrient balance becomes interrupted from its pruning. In addition, the stems of your leaves may fade to purple. This is a stress response from the plant, indicating that it suffered damage. Both of these symptoms should fade away within a few days, and your plants will be back to a healthy shade of green in no time.

How To Tell If Defoliation Failed – And What To Do

If you remove too much plant matter, you may damage your plant beyond repair. In addition, over-defoliating releases stress hormones, which may lead to a plant herming. If you notice that your plants don’t recover after a few days, you might be in trouble. At this point, you need to ensure that all of your ambient environmental conditions are dialed in. Proper humidity, temperature and light can help plants recover. In addition, make sure that your plants are getting enough nutrients, especially nitrogen – they’ll need it in order to recover.

Ready To Start?

Now that you know proper defoliation techniques and the effects it has on your plants, you’re ready to apply it to your own garden. Defoliation, more than any other aspect of growing, is both a science and an art form – it’ll take practice in order to master it. But once you do, your garden will thank you!

Comments:
0
PositiveLastAction
Plants need two things to grow: Water (+nutrients) flow from roots in a tube system to where they are needed. There is plenty of water and it makes no sense trying to focus this on upper part. There is enough for every part of the plant (and if not that's a problem on it's own)
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Helena
Thank you
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Herbies
Hello Martin Thank you for your comment. The amount of defoliation depends on many external factors, including which variety you have, how healthy the plant is, etc. You cannot say that in every case it will bring you 20% more. Everything is relative in this situation. Sincerely, Herbies
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Martin
What is the average higher yield of correct defoliation?
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Brandon Ainsworth
I wouldn't think defoliating in flower would be beneficial. You need the fan leaves for photosynthesis to occur to produce bigger buds. Removing fan leaves connected close to bud sites will decrease yields.
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Mr. Grow It
You'd be surprised. Pruning cannabis (lollipopping and defoliation) can increase yield if done correctly. It's similar to how other plants/trees are pruned to increase yields. Apples, pears, cherries, plums, apricot, and peaches are just some plants that are proven to increase yields with pruning - so this certainty isn't a cannabis-specific technique.
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Jenko
What do you guys think about deleafing autoflowering cannabis plants?
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Mr. Grow It
I've done minor defoliation on autoflowers but nothing major. I'd need to try it out some more in order to be for it or against it.
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Ed Alford
What to you do with the leaves after defoliation? Enjoyed the article! Thank you
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hey
Ed Alford keep them on my shelf as an ornament... duhh you throw them dude what else lol.
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NorthWest Jay
Fantastic article as always! I recommend any grower to read your amazing articles! Grow Grow Grow! ✌👽
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Herbies
Hello BK, and thank you for your feedback. We are happy that this article was useful to you
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BK
Thanks for showing the before and after defoliation in the flower stage. These are a most helpful guide, as I wasn't sure exactly what and where to take off. Cheers!
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