More crops per year for the grower. Ethylene antagonist as well. Need high carbohydrate plants. Usually done during last two weeks before sale from the greenhouse. This is a way of acclimating a plant to harsher conditions.
Water stress is probably the second most popular technique of toning.
Low light toning is restricted mainly to green plants. Low light toning of green plants helps them make the adjustment from the normally brighter environment of a greenhouse to that in interiorscaping. STS has been shown to prevent abscision of flowers and flower parts. Reduction of ethylene impact on plants sleeved or boxed where ethylene builds has been noted with STS sprays. PPM ethylene is injurious to plants.