Yield is a function of energy to the foilage that feeds the flowering buds. The largest bud is usually at the top of the plant since light tends to be placed ab

Yield is a function of energy to the foilage that feeds the flowering buds. The largest bud is usually at the top of the plant since light tends to be placed above a plant. During flowering, if you can distribute energy more evenly among the foiliage, you can increase yield by ~ 1/3 or more. Outdoor growers are reported to attach a string to the top of a plant when flowering begins, and bend the plant in an upside down `U` in order increase light distribution.