Cannabis Topping Technique: Step by Step Guide

Short Answer

Topping is the act of cutting off the main growing tip of a cannabis plant, right above a node, during the vegetative stage. The plant stops sending growth hormone to that single top and redirects it to the two shoots sitting at the node below. The result is two main colas instead of one. Timing matters more than technique. Top when the plant has 4 to 6 healthy nodes, use a clean blade, and let it recover for several days before you do anything else.

how many times to top cannabis plants

Why Growers Top

A single unpruned plant grows one tall central cola. That cola often sits closest to the light and takes most of the energy. Topping breaks that dominance. Instead of one top, you get two. Top those two later and you get four. Each cut slows vertical stretch and pushes growth outward, which helps in tents with limited headroom. More tops also mean more bud sites at a similar height, so the light spreads across the canopy instead of burning one tip.

cannabis topping benefits and drawbacks

When to Top

Wait until the plant has at least 4 to 6 nodes. A node is the point where a branch and leaf meet the main stem. Below that count, the plant is too small to lose its main tip and bounce back. Top during vegetative growth, not during flower. Once buds start forming, the plant puts energy into flowers and a cut costs you yield. If you plan to top more than once, space the cuts 5 to 7 days apart so the plant can rebuild.

cannabis topping guide for autoflowers

What You Need

• Clean, sharp scissors or pruning shears
• Isopropyl alcohol for sterilizing the blade
• Gloves if you handle several plants
• Good light so the node is easy to see

Step-by-Step Topping

1. Sterilize the blade with isopropyl alcohol and let it dry.
2. Find the top of the main stem and count down to the highest fully formed node.
3. Pinch or cut the stem just above that node, leaving the node and its two shoots intact.
4. Remove the cut tip from the grow area so it does not rot on the medium.
5. Leave the plant alone for 3 to 7 days.
6. Check for two new shoots growing from the node below the cut.
7. Repeat on each new main shoot if you want four or eight tops.

After the Cut

Keep the environment stable. Normal light, normal watering, no heavy feeding change. Stressed plants recover slower, so avoid transplanting on the same day. Some leaf tips may droop for a day. That is normal. If the cut site darkens or smells sour, the blade was not clean or the cut was too low. Trim back to healthy green tissue and clean your tools again.

Mistakes to Avoid

• Topping a seedling with fewer than 4 nodes
• Topping during the first two weeks of flower
• Cutting below the node and destroying the shoots
• Topping several times in one week
• Using dull or dirty blades