General Hydroponics' RapidStart (NPK Ratio 1-0.5-1) 500-ml. hydroponic plant nutrient solution functions as a root stimulator for plants and should be used during all stages of plant growth. RapidStart is composed of plant extracts, amino acids, and other nutrients that stimulate root growth and enhance plant vigor and yield. It's especially effective when used with clones, cuttings, or seedlings as a stress reducing agent aiding in transplant survival. Let your garden be all that it can be with RapidStart!