What Not to Plant Tomatoes With

Tomatoes are a popular garden plant that can be grown in various climates and soil types. However, not all plants make good companions for tomatoes. Before you start planning your tomato bed or garden plot, it's important to know what not to plant tomatoes with. Certain plants can attract pests or diseases that can harm your tomatoes or stunt their growth. Here are some plants you should avoid planting next to your tomato plants.

1. Brassicas

Brassicas, such as broccoli, cabbage, and cauliflower, should not be planted near tomato plants. These plants emit chemicals through their roots that can attract pests like aphids, whiteflies, and cabbage loopers. Additionally, brassicas and tomatoes both require the same nutrients from the soil, which can cause competition for resources and lower yields.

2. Nightshade plants

Tomatoes belong to the Solanaceae family, which includes other nightshade plants like peppers, eggplants, and potatoes. While these plants share similar growing conditions, it's not recommended to plant them together. Nightshade plants can attract similar pests and diseases, which can spread easily between them. For instance, planting tomatoes near potato plants can increase the risk of late blight, a disease that affects both crops.

3. Corn

While corn and tomatoes can be planted together, it's best to keep them apart. Corn is a heavy feeder that can deplete the soil of nutrients, particularly nitrogen. Tomatoes, on the other hand, require a lot of nitrogen to produce healthy foliage and fruits. Planting corn near your tomato plants can leave your tomatoes malnourished and weak.

4. Walnuts

Walnut trees and tomato plants should not be planted near each other. Walnut trees release a chemical called juglone, which can inhibit the growth and development of many plants, including tomatoes. The effects of juglone can linger in the soil for up to two years, which makes it difficult to grow tomatoes or other sensitive plants in that area. If you have a walnut tree in your yard, it's best to avoid planting tomatoes nearby.

5. Fennel

Fennel is an herb that has a strong flavor and aroma. It's also known to attract a variety of pests, including tomato hornworms. Tomato hornworms are a common pest that can quickly defoliate your tomato plants. Planting fennel near your tomato plants can increase the likelihood of an infestation. It's best to keep fennel away from your tomato bed or garden.

By avoiding these plants, you can help protect your tomatoes from pests and diseases, and ensure that they grow strong and healthy.