What are cannabis training techniques?
Cannabis training techniques are physical methods that shape a plant's structure to change how light reaches its buds. Growers bend, cut, tie, and weave stems so more bud sites sit in direct light instead of being shaded by the canopy. The main techniques are low-stress training (LST), topping, FIMing, super cropping, defoliation, lollipopping, screen of green (SCROG), and sea of green (SOG).
when to start topping weed plants
Why train cannabis plants at all?
An untrained plant grows one tall central cola and a ring of smaller side buds. Training spreads growth sideways, which raises the number of top-tier colas per plant. It also flattens the canopy so every bud gets the same light intensity.
Canopy Control Techniques for Indoor Grow: Topping, LST, SCROG
- More bud sites at the top of the canopy
- Better light penetration into lower branches
- Shorter, wider plants that fit tents and closets
- Higher yield per square foot of floor space
- Improved airflow, which lowers mold risk
Training does not change genetics. A low-yielding strain stays low-yielding. Training helps a plant reach its own ceiling.
lst vs topping cannabis training methods
Low-stress training (LST)
LST means bending stems without breaking them. You tie branches down to the pot rim or a trellis so they grow flat and sideways. The plant answers by sending auxin to the bend, which pushes side shoots upward.
lst vs topping cannabis training methods
How to do LST
- Wait until the plant has 4 to 6 nodes.
- Bend the main stem toward one edge of the pot.
- Anchor it with soft plant ties, garden wire, or coated twist ties.
- Adjust the ties every few days as the stem hardens.
Start in veg and continue through the first two weeks of flower. Stop once buds form so you do not snap resin-covered branches.
Topping and FIMing: high-stress training
Topping
Topping cuts the main growing tip above a node. The plant replaces that single tip with two, which doubles the number of main colas. Do it after the 4th or 5th node, then give the plant a week to recover before you cut again.
FIMing
FIMing removes about 75% of the new growth tip instead of the whole thing. It can push three or four new tops from one cut. Results vary more than topping, but the plant loses less growth.
Super cropping
Super cropping softens a stem by rolling it between your fingers, then bends it over. The stem forms a knuckle at the bend and hardens. Use it to level a tall branch without cutting it off.
Canopy techniques: SCROG, SOG, and lollipopping
Screen of green (SCROG)
A SCROG uses a horizontal net or screen above the pot. You tuck branches under the screen through veg until it fills, then flip to flower. Filling about 70% of the screen is a common trigger point.
Sea of green (SOG)
SOG skips a long veg cycle. You grow many small plants and flip them early, so the canopy is one layer of single colas. It works best with clones of one strain in a short space.
Lollipopping
Lollipopping strips growth from the bottom third of the plant. Those lower sites receive little light and produce airy buds. Removing them sends energy to the top colas.
Defoliation: when to remove leaves
Defoliation removes fan leaves that block bud sites. Do a light pass at day 21 of flower and a second pass near day 42 on a 9 to 10 week strain. Never strip a plant bare. Leaves are the plant's sugar factory, and heavy removal costs yield.
Mainlining and manifolding
Mainlining uses repeated topping to build a symmetrical hub of 8 or 16 colas from one stem. It adds 4 to 8 weeks of veg time. Growers choose it for even canopies in small tents with strong lights.
Which cannabis training techniques fit your grow?
- Small tent, one or two plants: LST plus a SCROG net.
- Many clones, fast turnaround: SOG with little to no topping.
- Limited height: top once, then bend with LST.
- Outdoor plants: top twice, then bend tall branches outward.
- First grow: LST alone, since a mistake is easy to fix.
Common training mistakes
- Training in late flower, when stems turn woody and brittle
- Cutting more than 30% of the foliage at one time
- Bending cold stems right after lights-on, when they snap
- Topping an autoflower past week 3, which shortens its veg window
Autoflowers flower on their own schedule, so most growers stick to LST and skip cutting. Photoperiod plants forgive heavy training because you control when they flip.
Frequently asked questions
Does topping stress a cannabis plant?
Yes, it counts as high-stress training. The plant pauses vertical growth for 2 to 5 days while it redirects hormones to the new tops. A healthy plant recovers with no yield loss.
How late can you train cannabis in flower?
Bending and tucking can continue through stretch, about 2 to 3 weeks after the flip. Cutting stops before that point. After stretch, stems harden and wounds heal slow.
Can you combine training techniques?
Yes, and most growers stack them. A common sequence is top in veg, LST through stretch, SCROG tucking, one defoliation pass at day 21, and lollipopping the same week.