Tomatoes splitting on the vine

Due to the changeable weather this year and other factors, many of our clients are finding that the tomatoes they have grown are starting to split.

Tomatoes can split or crack for a variety of reasons, often related to fluctuations in water uptake and environmental and weather conditions. Here are some common factors that contribute to tomato splitting

• Irregular Watering: Inconsistent watering practices, especially uneven watering or sudden excessive watering after a period of drought, can cause the tomato fruit to absorb water too quickly. This rapid influx of water can lead to the skin expanding faster than the fruit can accommodate, resulting in cracking or splitting.
• Rainfall: Heavy rainfall can cause the same rapid water uptake issue as irregular watering. The sudden increase in water availability can cause the fruit to expand and crack.
• Varietal Susceptibility: Some tomato varieties are more prone to splitting than others. Certain heirloom or older varieties may be more susceptible due to their genetics.
• Temperature Fluctuations: Extreme temperature fluctuations, particularly during the growing period, can contribute to tomato cracking. Hot, sunny days followed by cool nights can cause stress on the fruit’s skin, making it more prone to splitting.
• Nutrient Imbalance: Imbalances in soil nutrients, particularly calcium, can lead to poor fruit development and weaker cell walls, making tomatoes more susceptible to cracking.
• Overripe Fruits: Tomatoes that are allowed to ripen too much on the vine can become overly soft, making them more prone to cracking when exposed to sudden changes in water availability.
• Thin Skinned Varieties: Some tomato varieties have thinner skins that are more likely to crack compared to thicker-skinned varieties.
• Growth Rate: Rapid growth of the fruit can contribute to cracking. If the tomato plant experiences a sudden burst of growth, the skin may not be able to keep up with the internal expansion.

To minimise tomato splitting, consider the following practices

• Consistent Watering: Maintain a consistent watering schedule to avoid drastic fluctuations in soil moisture levels.
• Mulching: Apply a layer of mulch around the base of the plants to help regulate soil moisture and temperature.
• Fruit Support: Use tomato cages or stakes to support the plants and prevent heavy fruit clusters from putting stress on the stems.
• Pruning: Properly prune the tomato plants to encourage good air circulation and reduce competition for water and nutrients among the fruits.
• Harvest Timely: Harvest tomatoes when they are slightly under ripe to reduce the risk of overripening and splitting on the vine.
• Soil Management: Ensure your soil has a good balance of nutrients, particularly calcium, to promote healthy fruit development.

By addressing these factors, you can help minimise the occurrence of tomato splitting and increase the overall quality of your harvest.