Should I Top My Tomato Plants?

If you’re growing tomatoes, you may be wondering whether or not to top your plants. Topping, also called topping off or pruning, involves removing the top of the main stem of the tomato plant. Some gardeners swear by it, while others believe it’s unnecessary. Here are some factors to consider when deciding whether or not to top your tomato plants.

Arguments for Topping

One of the main arguments for topping tomato plants is that it can increase yields. By removing the top of the plant, you encourage it to put more energy into producing fruit instead of growing taller. This can lead to more and larger tomatoes.

Topping can also help control the size and shape of the plant. If you’re growing tomatoes in a small space or container, topping can keep the plant from outgrowing its space. Additionally, if you’re growing indeterminate tomatoes (those that continue to grow and produce fruit all season), topping can help keep the plant from becoming too bushy and unruly.

Arguments Against Topping

Some gardeners argue that topping tomato plants can actually decrease yields. By removing the top of the main stem, you also remove some of the plant’s leaves, which are necessary for photosynthesis (the process by which plants convert sunlight into energy). This can lead to smaller and fewer tomatoes.

Additionally, topping can make the plant more susceptible to pests and diseases. When you remove the top of the plant, you create an open wound that can allow pests and diseases to enter. This is particularly problematic in humid areas where fungal diseases are common.

When to Top Your Tomato Plants

If you do decide to top your tomato plants, there are some things to keep in mind. First, wait until the plant has at least six to eight sets of true leaves before topping. This will ensure that the plant is established enough to handle the stress of topping.

Next, only top indeterminate tomatoes. Determinate tomatoes (those that grow to a predetermined size and produce fruit all at once) should not be topped.

Finally, be sure to sterilize your pruning tools before and after topping to prevent the spread of diseases.

Conclusion

Whether or not to top your tomato plants is ultimately a personal decision. Consider the space you have, the type of tomato you’re growing, and your goals for your harvest. If you do decide to top your plants, be sure to do so with care and attention to avoid harming the plant.