FEEDS INSTANTLY: This 18-18-21 NPK water soluble vegetable plant food for tomatoes and vegetables starts to work instantly to promote quick, beautiful results in your outdoor garden. VEGETABLE FERTILIZER: Get the most from your vegetable garden with Miracle-Gro Water Soluble Tomato Plant Food, a water soluble vegetable garden fertilizer that’s specially formulated to help you grow more bountiful vegetables (vs. unfed plants).