Product Details: Help ensure a healthy harvest with Rot-Stop Tomato Blossom End Rot Concentrate from Bonide. The active ingredient, calcium derived from calcium chloride, corrects calcium deficiency in plants in your home garden. This product can be applied to a variety of plants including tomatoes, cucumbers, melons and peppers to produce healthy, blossoming plants. End-rot can occur at any point of fruit development, use Rot-Stop to stop end-rot in its tracks throughout the plant's lifecycle. This concentrated solution arrives ready to mix with water. To use, mix 2 oz of Rot-Stop per gallon of water and apply to affected plants to the point of run-off. Apply to affected plants every 5-7 days as needed. For full use instructions, please see product label. Rot-Stop can be used both indoors and outdoors on listed plants. Correct calcium deficiency to control blossom end rot on tomatoes with Rot Stop Tomato Blossom End Rot Ready-to-Use Spray from Bonide This garden fertilizer uses nutritional calcium derived from calcium chloride as the main active ingredient to prevent tomato blossom end rot caused by calcium deficiencies Apply to melons, peppers and cucumbers to correct calcium deficiencies and ensure a healthy harvest in your home garden Blossom end rot often appears after a period of rapid growth followed by dry conditions, or in periods of heavy rain This product arrives conveniently ready-to-use; to use, simply spray foliage to the point of run-off; for full use instructions, please see product label