A trellis is a support structure, most often a flexible net with square cells of about 10-15 cm (4-6 in), stretched horizontally over the plants. Indoors it does two jobs: a training screen (SCROG) that spreads tops into a flat canopy, and a support layer that stops heavy colas falling over in late flower.
In practice
Many growers run two layers: the first 20-30 cm (8-12 in) above the medium for training, the second 30-40 cm (12-16 in) higher for support during the stretch. The net must be anchored tightly to a frame or tent poles; a sagging net does neither job. Outdoors, vertical nets, cages or stakes do the same work against wind and rain.
Hanging retractable supports ("yo-yos") are used for single heavy branches.
Don't confuse with
- SCROG: the training method; a trellis is the equipment.
- Stakes and ties: individual supports rather than a whole-canopy net.
SCROG (screen of green) trains a few plants under a horizontal net, tucking shoots so the canopy forms a flat, evenly lit layer of many tops.Top shelf is the highest price tier of flower in a shop, used as slang for any premium-looking cannabis; it reflects pricing and appearance, not verified quality.An even canopy is one where all main tops sit at roughly the same height, so each receives similar light intensity and buds develop more uniformly.The dense, elongated cluster of flowers that forms at the end of a stem or branch; the main cola tops the leader.The stretch is the rapid increase in height in the first two to three weeks after switching to flower, when many cultivars grow 1.5 to 3 times taller.Plant ties are soft wire, rubber-coated twist ties or clips used to bend stems and anchor them during low-stress training or support.The canopy is the top layer of foliage and buds across a grow, the surface that intercepts most of the light and where yield is mostly made.Tucking is moving fan leaves and shoots behind or under others, or beneath a screen, so bud sites get light without removing any leaf area.
