Low Stress Training (LST) low stress training (lst) Low Stress Training (LST) is a type of pruning technique, designed to produce larger yields. It works by bending the plants stems and tying them down, so the lower leaves can absorb more light. This can help to produce more buds.Stages of growth and introducing pruning Related Terms High Stress Training (HST) / FIMing / Pruning / SOG (Sea of Green) / SCROG (Screen Of Green) / Overpruning << Back to Glossary