How To Fight Blossom End Rot On Tomato Plants

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How to Fight Blossom End Rot on Tomato Plants

What is Blossom End Rot?

Blossom end rot is a common problem that affects tomato plants. It is a physiological disorder that causes the bottom of the tomato fruit to rot, turning it black or brown. This condition occurs when there is a calcium deficiency in the plant, preventing it from properly absorbing and utilizing calcium.

What Causes Blossom End Rot?

Several factors can contribute to the development of blossom end rot. These include:

– Calcium deficiency in the soil

– Inconsistent watering

– Rapid plant growth

– Fluctuating temperatures

How to Prevent Blossom End Rot

Preventing blossom end rot is key to maintaining healthy tomato plants. Here are some tips to help you prevent this condition:

1. Provide Adequate Calcium

Ensure that your soil has sufficient calcium by adding lime or gypsum before planting. You can also use calcium-rich fertilizers to supplement the soil.

2. Maintain Consistent Moisture

Water your tomato plants consistently to prevent fluctuations in moisture levels. Avoid overwatering as well, as it can lead to other issues such as root rot.

3. Mulch Around the Plants

Apply a layer of organic mulch around your tomato plants to help regulate soil temperature and moisture levels. This can prevent stress on the plants and reduce the risk of blossom end rot.

4. Avoid Overfertilization

Excessive nitrogen fertilization can contribute to blossom end rot. Use a balanced fertilizer to provide the necessary nutrients without overloading the plants with nitrogen.

How to Treat Blossom End Rot

If you notice signs of blossom end rot on your tomato plants, there are steps you can take to address the issue:

1. Remove Affected Fruits

As soon as you spot a tomato with blossom end rot, remove it from the plant. This will prevent the rot from spreading to other fruits.

2. Adjust Watering and Fertilization

Check the moisture levels in the soil and adjust your watering schedule accordingly. Also, make sure you’re not overfertilizing the plants.

3. Apply Calcium Spray

You can purchase calcium sprays specifically designed for treating blossom end rot. Follow the instructions on the product label for application.


Blossom end rot can be a frustrating problem for tomato gardeners, but with proper prevention and treatment, it can be managed effectively. By providing adequate calcium, maintaining consistent moisture, and following best practices for fertilization, you can help your tomato plants thrive and avoid this common issue.

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