High Stress Training (Cannabis Growing)
High stress training (HST) is a group of cannabis training techniques that intentionally damage or remove plant tissue to control growth and shape. These methods rely on the plant’s recovery response to redirect energy and alter growth patterns.
HST techniques require recovery time and careful timing.
What Does HST Do for Cannabis Plants?
HST works by disrupting apical dominance and forcing the plant to redistribute growth hormones. This can result in:
- Increased branching
- More bud sites
- Stronger stem structure
- Improved canopy control
Because damage is involved, plants must pause growth while healing.
Common High Stress Training Techniques
HST methods include:
- Topping
- FIMing
- Supercropping
- Heavy defoliation
Each technique varies in intensity but all involve physical stress to the plant.
HST and Autoflower Cannabis
HST is generally risky for autoflowers.
Because autoflowers have a fixed life cycle:
- Recovery time reduces overall growth
- Late stress can significantly impact yield
- Poor timing can stunt plants permanently
If used on autoflowers, HST should be:
- Limited
- Done very early
- Applied only to vigorous plants
Many growers avoid HST entirely with autoflowers.
HST vs LST
Key differences include:
- HST: Tissue damage, recovery required, higher risk
- LST: No damage, continuous growth, lower risk
LST is preferred for autoflowers, while HST is more common with photoperiod plants.
Common Mistakes With HST
- Applying stress too late in growth
- Stacking multiple HST techniques
- Using HST on unhealthy plants
- Underestimating recovery time
Timing and plant health are critical.
Is HST Worth It?
HST can be effective when:
- Growing photoperiod plants
- Long vegetative periods are available
- Aggressive canopy control is needed
For autoflowers, HST is usually unnecessary.
Quick Summary
- HST stands for High Stress Training
- Involves damaging or removing plant tissue
- Requires recovery time
- Risky for autoflower cannabis
- Best used early or avoided for autos