This Exclusive To Marshalls Tomato Feed Is Guaranteed To Increase The Yield Of Your Crops, This Little 40 Gram Sachet Really Packs A Punch & Can Be Used On Any Indoor Or Outdoor Greenhouse Crop.if Used As Directed You Can Fed Your Crops For Up To 8 Weeks. Just Put One Level Teaspoon Into 5 Litres Of Water, Stir Well & Distribute Evenly Amongst Your Plants. Water Once Again With Regular Water To Make Sure The Nutrients Are Pushed Down Into The Roots.each Sachet Contains Enough Concentrated Feed For 8 Level Teaspoons.