Cannabis Topping Mistakes: 7 Errors That Cost You Yield
The most costly cannabis topping mistakes, ranked by yield damage and how hard they are to fix, plus recovery steps for plants cut at the wrong time.
Topping vs LST: The Short Answer
For most home growers, low-stress training (LST) is the first pick over topping. LST bends and ties branches without cutting. It works on autoflowers, is easy to undo, and does not often stall growth. Topping is a high-stress technique that can boost yields when timed right, but it demands healthy plants, photoperiod strains, and a recovery period. If you buy seeds or a grow kit, start with LST tools and only add topping after a few harvests.
What to Look For in Training Tools
For LST, you need soft plant ties, training clips, and a trellis net. Look for ties that are wide and flexible to avoid cutting into stems. Clips should grip without pinching. A trellis net with 3 to 4 inch squares supports even canopy growth. For topping, buy small, sharp pruning shears and isopropyl alcohol for sterilization. Avoid dull blades that crush stems. A rooting gel helps if you plan to clone the cut top.
The Ultimate Buying Guide for Cannabis Toppings After Flowering
Parameter Bands for Each Method
Topping
- Wait until the plant has 4 to 6 nodes.
- Top above the 5th node for two main colas.
- Do this only in the vegetative stage.
- Best for photoperiod strains with a long veg.
- Allow 3 to 7 days for recovery.
LST
- Start when the plant has 3 to 4 nodes.
- Bend the main stem to 90 degrees.
- Adjust ties every 2 to 3 days.
- Works for autoflowers and photoperiods.
- Keep bending throughout veg and early flower.
Common Pitfalls
- Topping autoflowers: they have a short life cycle and little time to recover.
- Topping too early: before 4 nodes, the plant may stall or die.
- Topping in flower: this stresses the plant and reduces yields.
- LST too late: bending stiff stems in flower can snap branches.
- Using dirty tools: always sterilize shears before topping.
- Overbending: a sharp bend can break the stem. Bend in small steps.
FAQ
Can I use both topping and LST?
Yes. Top first, wait for recovery, then LST the new branches. This combo creates more colas and a wider canopy.
Which method is better for autoflowers?
LST. Autoflowers flower on a fixed schedule. Topping can delay growth and reduce yield.
How long does recovery take after topping?
Most plants recover in 3 to 7 days. If growth stalls longer, check for stress from light, water, or nutrients.
Do I need a trellis net for LST?
Not always. Soft ties and clips work for small plants. A trellis net helps when branches get heavy in flower.