The short answer
Training is any deliberate bending, cutting, or spreading that changes a cannabis plant's shape. You do it to get more top bud sites under the same light, keep an even canopy, and control height in a tent. For most home growers, low stress training (LST) plus one topping session in veg does the heavy lifting. Screens, super cropping, and defoliation are add-ons you reach for when the plant outgrows the space or the light footprint is uneven.
Why bending changes the plant
Cannabis grows with apical dominance: the highest shoot gets the most auxin and grows fastest. When you bend that shoot below the rest, auxin spreads out and the lower branches catch up. That is the whole logic behind LST and super cropping. Cutting the top removes the dominant tip and forces two or more shoots to take over. Both routes end in the same place, a wider, flatter plant with more even bud development.
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None of this is strain-specific magic. Indica-leaning plants with tight node spacing respond well to LST and screens. Tall sativa-leaning plants often need topping plus bending to stay under a tent ceiling.
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Low stress training (LST)
LST means bending stems without breaking them. I start when the plant has 4 to 6 nodes and the main stem is still flexible enough to fold without cracking. Soft plant ties, garden wire, or clips anchored to the pot rim all work.
- Bend the main stem outward and tie it so the tip sits below the side branches.
- Spread side branches toward the corners of the pot as they stretch.
- Re-tie every few days during veg, since stems harden and new growth points up again.
Recovery time is near zero. That makes LST the safest option for autoflowers and for growers who do not want to stress a plant they cannot replace.
Topping and FIM
Topping cuts the main growing tip just above a node. Two shoots replace it. Most photoperiod plants handle this after the 4th or 5th node, and you can top again two or three times if you have the veg time and vertical room.
FIM is a partial cut through the tip that leaves some tissue intact. Done right, you get three or four new tops instead of two. Done wrong, it is just a messy topping. Either way, give the plant 3 to 5 days to recover before you train again.
Super cropping
Super cropping is high stress training: you pinch the stem between your fingers until the inner tissue softens, then bend it over. The plant forms a knuckle at the bend and the branch below grows stronger. It works on thick stems that would snap from a plain bend. Support the branch afterward and skip further stress for a week.
SCROG and SOG
A screen of green (SCROG) uses a horizontal net. You tuck growing tips under the net during stretch so every cola sits at the same height. It is the best fix for a light that only covers a small footprint, and it turns one plant into a flat canopy.
Sea of green (SOG) goes the other way: many small plants, little veg time, one main cola each. It suits clones and fast turnover. SOG needs more plants and often more legal headroom under home grow limits, so check your state rules and plant count before you commit.
Lollipopping and defoliation
Lollipopping strips the lower third of a plant that will not get usable light anyway. Those sites produce larf, and removing them sends resources upward. Defoliation removes fan leaves that block bud sites.
Both are easy to overdo. I take leaves in stages, never more than a modest portion at once, and I leave enough foliage for the plant to keep photosynthesizing. Heavy stripping in flower costs yield more often than it adds it.
Mainlining (manifolding)
Mainlining builds a symmetric hub: top above the 3rd node, remove everything below, then top each new shoot to double the number of tops. The result is 8 even colas on a plant with an open center. It takes extra veg time and works best with photoperiod plants, since autos rarely have the runway.
When to train
Veg is the window. Topping, mainlining, and heavy bending belong in veg when the plant can rebuild. LST can continue into the first two weeks of flower as stretch happens, mostly to keep the canopy level. After stretch stops, I stop bending and let the plant finish. Late-flower cuts and breaks cost more than they return.
Autoflowers get a shorter window. LST yes. Topping only if the plant is vigorous and you are early. Anything that costs a week of growth is a real cost on a fixed clock.
Mistakes I see most
- Topping before the plant has 4 or more nodes, which stalls it.
- Training a plant that is thirsty or heat stressed. Fix the environment first.
- Bending dry, stiff stems. Water an hour before, and squeeze before you fold.
- Stacking techniques in the same week: top, then wait, then bend.
- Running a SCROG without the space to reach the back of the net.
My order of operations
Start with LST at 4 to 6 nodes. Top once, wait a few days, then spread the new tops. Add a screen if the footprint is uneven. Lollipop the lower third before flip. Then leave it mostly alone. That sequence covers most setups, and every step after LST is optional.
Cannabis cultivation is legal in many US states but not all, and home grow rules vary by plant count, canopy size, and possession limits. Confirm what applies where you live before you plan a grow.