Miracle-Gro All Purpose Plant Food, 10-Pound (Plant Fertilizer). Miracle-Gro Water Soluble All Purpose Plant Food instantly feeds vegetables, trees, shrubs, and houseplants to grow bigger and more beautiful than unfed plants. Simply feed them every 1-2 weeks. The formula is safe for all plants, and is guaranteed not to burn when used as directed. Get beautiful results with Miracle-Gro.