Superthrive Plant Vitamins Hormones All Organic 1 Oz Superthrive, a favorite of plant lovers. Superthrive is not a fertilizer, but rather a health supplement for plants - even transplants and otherwise distressed plants. Contains a unique mix of 50 vitamins and hormones. Highly concentrated. This is the one once size, also available from me in 2 and 4 once and one pint sizes.