# Defoliation

> Defoliation is removing fan leaves from a plant to open the canopy to light and air; GenetixBay's house view is to tuck leaves rather than strip them.

- Canonical: https://genetixbay.com/knowledge/glossary/defoliation.html
- Also written: defoliating, defol, defoliate, leaf stripping, stripping fan leaves
- Glossary category: Cultivation and training · Evidence: Contested
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

Defoliation is the deliberate removal of leaves, usually large [fan leaves](https://genetixbay.com/knowledge/glossary/fan-leaf.md), to expose [bud sites](https://genetixbay.com/knowledge/glossary/bud-site.md), improve airflow and reduce humidity within the canopy. It ranges from removing a few leaves that shade a bud to near-total stripping at set points in flower ([schwazzing](https://genetixbay.com/knowledge/glossary/schwazzing.md)).

## In practice

Leaves are the plant's solar panels: they capture light and supply sugars to the developing flowers. Removing a shading leaf can help a bud underneath; removing too many cuts [photosynthesis](https://genetixbay.com/knowledge/glossary/photosynthesis.md). Responses vary sharply by cultivar. Most growers who defoliate do so lightly before the flip and again around week 3 of flower.

## Myth check

House position: "tuck, don't pluck". Maximise leaf surface area, like a solar farm for the buds. Stripping within reason doesn't appear to hurt yield, and some clones grow just as fast or faster after losing most leaves, while others suffer; in the founder's experience tucking helps more. Whether defoliation raises yield or [cannabinoids](https://genetixbay.com/knowledge/glossary/cannabinoid.md) is an open question for GenetixBay [Bay Trials](https://genetixbay.com/knowledge/glossary/bay-trials.md). Evidence: Contested. See [defoliation and lollipopping](https://genetixbay.com/knowledge/training/defoliation-lollipopping.md) and [Mythbusters](https://genetixbay.com/knowledge/mythbusters.md).

## Don't confuse with

- **Tucking**: moving leaves aside instead of removing them.
- **Leaf drop (senescence)**: natural yellowing and loss of leaves late in flower.

## Related terms

[Lollipopping](https://genetixbay.com/knowledge/glossary/lollipopping.md), [Schwazzing](https://genetixbay.com/knowledge/glossary/schwazzing.md), [Tucking](https://genetixbay.com/knowledge/glossary/tucking.md), [Fan leaf](https://genetixbay.com/knowledge/glossary/fan-leaf.md), [Canopy](https://genetixbay.com/knowledge/glossary/canopy.md)

## Read more

- [Defoliation and lollipopping: what to remove, when, and the evidence](https://genetixbay.com/knowledge/training/defoliation-lollipopping.md)