Simply Calcium helps prevent calcium deficiency, the most common cause of blossom-end rot in tomatoes and other plants like peppers, melons, eggplants and cucumbers. Blossom end rot appears as a round, brown sunken area on the end of fruit. Maintain regular watering when using this product to help prevent blossom end rot. Foliar: 30 mL (2 tbsp) per litre of water. Spray plants until mixture is thoroughly covering the foliage and fruit.Soil drench: 60 mL (4 tbsp) per litre of water. Water thoroughly around drip line. Apply weekly for 3 to 4 weeks during periods of rapid growth or following heavy rains when conditions are favorable for blossom end rot.Simply Calcium should be used in conjunction with fertilizers such as Orgunique’s Tomato & Vegetable liquid fertilizer.