Low Stress Training vs High Stress Training: Pick LST First

Quick pick

Start with low stress training (LST). LST bends stems and ties them down. No tissue is cut. Recovery takes 1 to 3 days. High stress training (HST) cuts, pinches, or crushes tissue. Recovery takes 3 to 10 days. Add HST only after the plant has 4 to 6 nodes and shows fast growth.

LST methods: bending, tying, tucking, SCROG net, light defoliation.
HST methods: topping, fimming, supercropping, mainlining, lollipopping, heavy defoliation.
Plant response: LST redirects growth. HST triggers a wound response.
Recovery time: LST 1 to 3 days. HST 3 to 10 days.
Canopy result: LST spreads light to lower buds. HST adds cola sites.
Risk: LST low. HST higher. A bad cut can split a main stem.
Timing: LST any time in veg. HST in veg, stop 2 to 3 weeks before the flip in most cases.

LST in practice

Bend the top stem toward a gap in the canopy. Tie it with soft garden wire. The apex drops in height and side shoots get direct light. Repeat every 2 to 3 days. A SCROG net does the same job at scale. Plants stay in veg longer and the canopy stays level.

cannabis training techniques for higher yields

HST in practice

Topping cuts the main stem above the 4th or 5th node. Two colas replace one. Fimming cuts about 80 percent of the new growth and can give 4 tops. Supercropping pinches the stem until the inner tissue softens, then bends it over. Mainlining builds 8 colas from one plant with repeated topping.

Numbers that matter

Node count before topping: 4 to 6
LST tie points per plant: 4 to 12 in a 3 by 3 foot tent
Recovery after topping: 3 to 7 days
Recovery after heavy defoliation: 5 to 10 days
Veg time added by mainlining: 2 to 4 weeks

Which to run

Autoflower plants: LST only. The veg window runs 3 to 5 weeks and does not wait. Photoperiod plants in a small tent: LST plus one topping. Photoperiod plants in a large room: mainline or SCROG, then defoliate at day 21 of flower.

How to LST and HST Cannabis: A Comprehensive Guide

Options after harvest

A level canopy gives more bud sites at one height. Trimming runs faster. Cured flower from these runs is graded by bud density, trim quality, and moisture. Retail THC products from the same harvests move as flower, pre-rolls, and concentrates. Check total THC and the terpene list on the label before you buy.