LST vs HST

LST and HST represent the two primary cannabis training philosophies, each with optimal use cases. LST (low-stress training) involves bending branches into desired positions and securing them with soft ties — no plant tissue is wounded, no recovery time is needed, and plants continue growing immediately. LST is ideal for: autoflowers (which cannot afford recovery time), beginners learning training fundamentals, large container plants where canopy width matters, and grows where every week of veg time matters for harvest scheduling. The most aggressive form of LST is SCROG (screen of green), using a horizontal mesh to enforce a flat canopy of evenly-trained branches. HST (high-stress training) intentionally wounds the plant: topping (cutting the apical tip), fimming (partially cutting the apical tip), supercropping (pinching and bending stems until internal fibers crack), defoliation (strategic leaf removal), and lollipopping (removing lower growth entirely). HST exploits the plant's wound response — stress hormones trigger compensatory growth including new branching, denser node spacing, increased trichome production, and stronger cell wall development at injury sites. HST advantages: stronger yield gains (often 30-100% over untrained plants), more compact plant structures, ability to manipulate plant shape dramatically. HST disadvantages: requires 3-7 days of recovery before plants resume vigorous growth, must be performed only during vegetative growth (HST during flowering causes stress-induced hermaphroditism), poorly suited to autoflowers (no recovery time available), demands skill and timing knowledge. Most experienced growers combine the two approaches: use HST early in vegetative (topping for branch multiplication), then transition to LST for canopy management until flowering. Combining mainlining (HST) with SCROG (LST) is the gold-standard high-yield indoor training protocol.