What is defoliation?
Defoliation is the practice of removing some of the large leaves from a cannabis plant so that light reaches the buds better and air can flow between the branches. It's a common technique indoors, but it's best done in moderation.
The leaves that get removed are mainly the big, fan-shaped ones that cover the shoots below. They are often called "fan leaves".
Keep in mind that leaves are the plant's energy factory: they turn light into food. Removing a few that are in the way helps; removing too many weakens the plant. It's like pruning a rose bush: a good thinning does it good, but if you overdo it, the plant suffers.
What is it for?
- More light on the buds: by removing the leaves that cast shade, the shoots underneath get more light and develop better.
- Better airflow: with fewer leaves crowded together, air circulates and humidity doesn't build up. That lowers the risk of mold on the buds.
- A tidier plant: it's easier to see how it's doing and to spot pests.
When does it make sense?
Mainly indoors, with bushy, very dense plants, or in humid areas where mold is a concern. Roughly speaking, it's usually done at two points: at the end of the growth stage or at the start of flowering, and once more around the middle of flowering, always removing only the leaves that are in the way.
If your plant is small or has few leaves, there's no need. With autoflowers, be more careful: they have little time to recover and, if you remove a lot of leaves, they may yield less. When in doubt, remove less.
Don't confuse it with trimming, which means cutting away the small leaves around the buds after harvest.
Related terms
Before you grow, check the laws in your country: growing cannabis is not allowed everywhere.
