ATA Rootfast Ata Rootfast is a 100% plant-based root stimulator that promotes increased root growth and increased plant resistance. It can be used in any medium. Extremely rapid root formation – we've received very positive customer feedback since the product's launch! APPLICATION: Add to the plant every time you water it in the first and second week. DOSAGE (1:1000): 1 ml per 1 liter of water.