Southern Ag Plant Starter Soluble Fertilizer 12-48-8 in 3 Pound Bags Plant Starter 12-48-8 is a water soluble fertilizer with micronutrients. High in Phosphorous for new plantings. 12-48-8 fertilizer promotes more roots, flowers and fruit. Great for annuals, grass, vegetables and plants grown from seed. Use as Transplant Solution, Drench or Foliar Spray