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Bonide Rot-Stop Tomato Blossom End Rot Concentrate
Bonide Rot-Stop Tomato Blossom End Rot Concentrate is a high calcium-rich supplement that easily prevents blossom end rot in tomatoes, cucumbers, melons, and peppers for the average gardener.
04/14/26
Bonide Rot-Stop Tomato Blossom End Rot Concentrate, manufactured by Bonide, is an effective liquid calcium supplement that delivers a direct source of calcium to vegetable garden fruits and foliage.
Unlike slow-acting soil amendments, this product provides calcium directly to the crop's fruits and vegetables, ensuring rapid results. By addressing these basic calcium needs, Bonide Rot-Stop Tomato Blossom End Rot Concentrate not only prevents blossom end rot but also strengthens plant structure, leading to better crop quality and yield.
Bonide Rot-Stop Tomato Blossom End Rot Concentrate is an easy-to-use liquid calcium fertilizer supplement that helps beginning or experienced gardeners prevent blossom end rot effectively.
Tools Needed
You will need a handheld pump sprayer or backpack sprayer to make applications with.
How to Use
- Step 1: Be sure to identify that there is blossom end rot on your crops and not some other disease before applying Bonide Rot-Stop Tomato Blossom End Rot Concentrate. Even if no symptoms are present, apply the solution as a preventative measure if calcium deficiency is suspected. Apply 2 fl. oz. of Bonide Rot-Stop Tomato Blossom End Rot Concentrate per gallon of water.
- Step 2: Fill the sprayer with half the amount of water and add the proper amount of product. Next, pour in the remaining half of the water and agitate the tank until mixed.
- Step 3: Spray the foliage and the fruits of the plant to the point of runoff.
Where to Use
Bonide Rot-Stop Tomato Blossom End Rot Concentrate can be used on tomatoes, cucumbers, melons, and peppers.
When to Use
Apply in the early morning or evening when temperatures are lower to avoid foliage burn. Make applications 5 to 7 days apart when conditions are favorable for the appearance of the disorder.
Safety Information
Bonide Rot-Stop Tomato Blossom End Rot Concentrate is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product.
Special Considerations
Regular spray programs of this product are not recommended as prolonged spraying and rates in excess of those specified can cause foliage burn.
Foliar fertilization is intended as a supplement to a regular fertilization program and may not, by itself, provide all the nutrients normally required by crops or other intended plants.
| Restricted Use | No |
|---|---|
| Availability | Online |
| Keith's Pro Tip | "Inconsistent watering is a major contributor to blossom-end rot. Keep soil moisture consistent to support calcium uptake. Use Bonide Rot-Stop alongside good watering practices for optimal results." |
| Time to Kill | Bonide Rot-Stop will deliver calcium immediately upon application. |
| Chemical Type | Fertilizer |
| Formulation | Emulsifiable Concentrate (EC) |
| Application Methods | Spot Treatment |
| Active Ingredient | Calcium 9.20% |
| Application Equipment | Backpack Sprayer, Pump Sprayer |
| Mix Rate | Apply 2 fl. oz. of Bonide Rot-Stop Tomato Blossom End Rot Concentrate per gallon of water. |
| Use Sites | Outdoors |
| Yield | N/A |
| EPA Registration No. | N/A |
| Shelf Life | Bonide Rot-Stop Tomato Blossom End Rot Concentrate will last for 3 years when stored in a dry, clean location. |
| Comparable Products | Bonide Rot-Stop Tomato Blossom End Rot RTU |
| Children or pets? | No |
| Property Characteristics | None |
| Availability | Online |
| Restricted Use | No |
| Brand | BONIDE |
| Keith's Pro Tips | "Inconsistent watering is a major contributor to blossom-end rot. Keep soil moisture consistent to support calcium uptake. Use Bonide Rot-Stop alongside good watering practices for optimal results." |
| Target Pests | Blossom End Rot |
| Application Equipment | Backpack Sprayer, Pump Sprayer |
| Application Methods | Spot Treatment |
| Active Ingredient | Calcium 9.20% |
| Product Type | Fertilizer |
| Formulation | Emulsifiable Concentrate (EC) |
| Application Rate | Apply 2 fl. oz. of Bonide Rot-Stop Tomato Blossom End Rot Concentrate per gallon of water. |
| Shelf Life | Bonide Rot-Stop Tomato Blossom End Rot Concentrate will last for 3 years when stored in a dry, clean location. |
| Yield | N/A |
| Use Sites | Outdoors |
| Time to Kill | Bonide Rot-Stop will deliver calcium immediately upon application. |
| Comparable Products | Bonide Rot-Stop Tomato Blossom End Rot RTU |
| Incompatible Home Siding | Brick, Hardie Plank, Stone Veneer, Stucco, Wood, Vinyl |
| EPA Registration # | N/A |
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.



