Start with LST. Low-stress training gives most home growers the best return for the least risk: no cuts, no recovery stall, and it works on autoflowers. Topping is the better second step, not the first, and it pays off only on healthy photoperiod plants with at least three weeks of veg left.
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LST vs topping at a glance
- LST: bends and ties branches, no cutting, plant never stops growing.
- Topping: cuts the main tip, splits one cola into two, needs recovery time.
- Best for autos: LST.
- Best for long veg photoperiods: topping plus LST.
Why LST is the safer first pick
LST pulls branches sideways and holds them there with soft ties. Light reaches lower nodes, the canopy levels out, and the plant keeps growing the whole time. Because nothing is cut, there is no shock window and no risk of losing a top to infection.
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It also suits small tents. A trained plant stays short and wide, which fits under a lower light without scorching the tallest tips.
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When topping beats LST
Topping removes the apical bud and forces the node below to push two shoots. On a vigorous photoperiod plant with a long veg, trading one tip for two is a good deal.
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Skip it when the plant is stressed, rootbound, or already flowering. Autoflowers are a gamble on a fixed clock, and some growers pull it off above the fourth node while others lose two weeks of growth.
Can you combine LST and topping?
Yes, and most experienced growers do. Top once or twice in veg, wait for the new shoots to reach a few inches, then tie those shoots outward to keep the canopy flat.
Top first, train second. Bending the plant before the cuts makes the new growth harder to reach and harder to spread.
Which method suits autoflowers?
LST, almost always. Autos flip to flower on their own schedule, so any stress that pauses growth eats directly into yield.
If you do top an auto, do it early above the fourth node and only on a plant that is clearly thriving.
How to top without stunting the plant
- Wait for four to five healthy nodes and strong side growth.
- Pinch or snip the main tip just above a node, leaving a clean stem.
- Hold off on feeding changes for a few days while the plant recovers.
- Tie down the two new shoots once they reach two to three inches.
Does topping stress the plant?
Yes, briefly. Expect two to five days of slower vertical growth while the plant redirects energy to the lower nodes. LST has no comparable pause.
How fast does LST show results?
New shoots turn upward within a day or two, and the canopy starts to even out in about a week. Recheck ties every few days so they do not dig into stems.
The verdict
Pick LST first. Add topping once you have a healthy photoperiod run under your belt and enough veg time to let the plant recover. Together they build the flat, even canopy that yields best under indoor lights.