Cannabis topping is the practice of cutting off the top growing tip of a plant to encourage two or more main colas to develop. It is done during the vegetative stage, usually just above a healthy node, once the plant has several sets of true leaves. Topping changes plant shape more than it changes total yield potential, so timing and plant health matter more than the cut itself.
What topping does to a cannabis plant
The top of a cannabis shoot produces auxin, a hormone that suppresses the growth of lower side branches. This is called apical dominance. When you remove that top tip, the suppression lifts and the branches just below the cut start growing upward. The result is a wider, flatter plant with multiple tops instead of one dominant cola.
Growers use cannabis topping for a few practical reasons:
- To create a more even canopy that uses light across the whole grow space
- To control height in tents and small rooms
- To produce several main colas rather than one large top
- To prepare a plant for further training such as low-stress training or a screen
When to top a cannabis plant
Top during vigorous vegetative growth, not in the seedling stage and not after the plant has started flowering. A common starting point is when the plant has four to six nodes and is growing actively. Topping too early slows a small plant. Topping too late, or during early flower, removes bud sites you cannot replace.
Signs the plant is ready:
- At least four or five sets of true leaves
- New growth at the top every day or two
- Healthy color and no signs of stress, pests, or nutrient problems
- Enough time left in veg to recover before flipping to flower
How to top cannabis step by step
- Clean your scissors or snips with rubbing alcohol before you cut.
- Find the newest node at the top of the main stem, where two small shoots sit on either side.
- Pinch or snip the growth just above that node, leaving the two shoots intact.
- Remove only the small top tip. Do not strip leaves or cut into the main stem below the node.
- Leave the plant alone for several days so the two shoots can start growing.
You can top again later on each new main shoot if you want more tops, but give the plant time to recover between rounds. Each topping multiplies the number of tops, so two rounds can produce four main colas and three rounds can produce eight, assuming the plant stays healthy.
Topping compared with FIMing and low-stress training
FIMing is a variant that cuts through part of the top growth instead of removing it fully. It can produce several tops from one site, but results are less predictable than a clean topping cut. Low-stress training bends branches instead of cutting them, which spreads the plant without opening a wound. Many growers combine topping with low-stress training to build a level canopy.
Aftercare and common mistakes
- Keep light, water, and temperature stable for the first week after topping.
- Do not top a plant that is already stressed, overwatered, or recovering from transplant.
- Avoid topping autoflowers unless the plant is growing strongly and has a long enough veg period.
- Do not top in late veg or early flower, when the plant has stopped building new main branches.
A topped plant usually shows new growth within a few days. If the cut site stays stalled for more than a week, check watering, root zone temperature, and light intensity before making another cut.