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18. Tomato fruit turns brown at the bottom -> Blossom end rot

Blossom end rot is a common problem on tomato plants and occurs when the fruit rots or develops brown spots on the underside. This is often caused by a lack of calcium or problems with calcium absorption into the fruit. Here are some steps one can take to prevent or treat blossom end rot on tomatoes:

  1. Ensure adequate watering

    • Keep the soil evenly moist by watering regularly and deeply. However, be sure to avoid waterlogging as this can damage the roots.

  2. Avoid fluctuations in irrigation

    • Irregular watering can disrupt the plant's calcium absorption. Watering should be kept constant, especially during fruit formation.

  3. Increase calcium intake

    • It is possible to increase calcium intake by adding calcium-rich fertilizers or lime to the soil. A source of calcium such as crushed eggshells may also be useful. Add these to the planting hole before planting

  4. Use mulch

    • Mulch around plants can help conserve soil moisture and reduce temperature fluctuations.

  5. Regular inspection and harvest

    • Monitor tomato plants carefully and harvest ripe fruits in a timely manner to minimize stress and loss of resources in the plant.

  6. Check the pH value of the soil

    • The soil pH should be in the optimal range for tomatoes, usually between 6.0 and 6.8. An incorrect pH value can affect the absorption of calcium.

  7. Use special preparations

    • There are also special preparations on the market designed to prevent blossom end rot. These can be helpful when other measures are not sufficient.


By implementing these tips and paying attention to the needs of your tomato plants, one can reduce the likelihood of blossom end rot and achieve a healthier tomato harvest.

This is what tomatoes with blossom end rot look like

Tomatensorte Mila mit deutlicher Blütenendfäule
Tomatensorte Drapée mit deutlicher Blütenendfäule
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