Topping and Training Cannabis Clones: When and How

Top a clone once it is rooted, transplanted and growing steadily with four to six healthy nodes, by cutting the main growing tip off just above a node. That turns a single stem into two main branches. Follow it a week later with low stress training to spread the branches flat, and you get a wider, more even canopy from one plant.

This guide covers when to top, how to do it cleanly and how to train the new growth. It assumes you are growing where it is legal and that you are 21 or older.

What does topping do?

A cannabis plant normally grows a tall main stem, with one dominant tip at the top. That tip sends a hormone signal down the plant that keeps the side branches smaller. When you remove the tip, the plant redirects its energy. The two nodes just below the cut send out new tops that grow at about the same pace, so one stem becomes two.

The result is a shorter, bushier plant with a wider footprint. It is a common way to fill a space with fewer plants.

When should I top a clone?

Timing matters more than technique. Check three things:

1. Rooted and transplanted. The clone should already be in its next container and growing. Our guide on transplanting rooted clones covers timing.
2. Four to six nodes. Fewer than that and the plant is still too small to recover quickly. Dense, slow-growing cultivars can wait for six or more.
3. Healthy. No droop, no pests, no deficiencies. A struggling plant will recover slowly from a cut. If yours is drooping, read why clones wilt first.

Do not top during the settling-in week. The first 14 days belong to rooting and adjustment, as described in our clone care guide.

How do I top a clone step by step?

1. Prepare. Wipe your scissors with isopropyl alcohol. Water the plant a few hours earlier.
2. Find your node. Look at the main stem and locate a node with a healthy pair of leaves and side shoots starting, about the fourth or fifth node up.
3. Cut above it. Make a clean cut about a quarter inch above the node, removing the growing tip. Do not crush the stem.
4. Leave it alone. Keep light, feed and temperature steady. Expect a few days of slow growth.
5. Watch the new tops. Within about a week, the two nodes below the cut should push out new growth.

Some growers use the removed tip as a fresh cutting. If you do, keep it clean and give it humidity. Our guide on how long clones take to root explains the timeline.

What is low stress training?

Low stress training, or LST, means gently bending branches and tying them in place so the plant grows wide instead of tall. You use soft plant ties or wire, anchored to the container or the frame around it.

It works because a branch that is bent sideways stops being the dominant tip. The nodes along it send up new vertical shoots, each competing equally for light.

How do I do LST on a topped clone?

1. Wait about a week after topping, until the two new tops are growing.
2. Bend slowly. Move a branch outward and down, and stop if it feels like it will snap. Do it over a day or two rather than all at once.
3. Tie loosely. The tie should hold position, not choke the stem.
4. Adjust every few days. As the tops keep growing upward, bring them back down and level.
5. Keep the highest tips at about the same height. An even canopy gets even light.

If a stem cracks, do not panic. A small crack can be supported with a bit of tape, and many plants heal it within a week.

How often can I top a plant?

One topping gives two main tops. Topping those again gives four, and so on. Each round adds about a week of recovery and slows total time. Most growers top once or twice, then train. More than that makes sense only when you have time and a lot of space for a few big plants.

How many rounds you do feeds into your schedule. Our guide to how long to veg clones explains how training changes your veg time.

What mistakes should I avoid?

• Topping too early. A small, weak plant loses ground.
• Dirty tools. Wipe scissors between plants to avoid spreading problems.
• Training and topping on the same day. Space them a week apart.
• Pulling too hard. Bend gently and in steps.
• Topping after the flip. Once a plant has gone to flowering, topping is too late and hurts the plant.

Is topping right for every clone?

Not always. If you run many plants in a small space, one main stem each is often the better call. If you run a few plants in a large space, topping fills the room. Some cultivars branch so naturally that they barely need it, and the notes on each clone page mention growth habit and stretch.

PrimoCuts sells rooted, pest-checked clones only, never flower. Browse the current clones and join the drop list for first access to new drops. Delivery takes about one month, and we let you know if an earlier slot opens up.