Do Not Plant Tomatoes Next To: Tips for Effective Companion Planting

Companion planting is a technique that involves growing different crops in close proximity to one another, with the aim of benefiting one or both plants. However, not all plant combinations work well together. One common mistake that many gardeners make is planting tomatoes next to certain crops that can hinder their growth and health. Here's a list of plants that you should avoid planting next to your tomatoes:

Potatoes

Tomatoes and potatoes are both members of the nightshade family, which means they are susceptible to similar diseases and pests. Planting them together can increase the risk of diseases like blight and pests like the Colorado potato beetle. In addition, potatoes tend to have a higher demand for nutrients than tomatoes, making it harder for both plants to thrive in the same soil.

Fennel

Fennel is well known for its distinctive aniseed flavor and aroma, but it can also have a negative impact on tomatoes. Fennel secretes a chemical called anethole that can inhibit the growth of nearby plants, including tomatoes. In addition, fennel is a host plant for the tomato hornworm, a common pest that feeds on tomato leaves and stems.

Corn

Tomatoes and corn are incompatible for several reasons. First, they have different root systems, with tomatoes having shallow roots and corn having deep taproots. This can lead to competition for water and nutrients, which can weaken both plants. In addition, corn attracts the tomato fruitworm, another pest that can damage tomatoes. Finally, some varieties of corn can release allelopathic chemicals that can inhibit the growth of nearby plants, including tomatoes.

Brassicas

Brassicas, including broccoli, cabbage, and cauliflower, can stunt the growth of tomatoes and reduce their yield. These plants release compounds called glucosinolates that can inhibit the growth of neighboring plants. In addition, brassicas are host plants for the cabbage worm, which can feed on tomato leaves and fruits. If you do decide to plant brassicas and tomatoes together, make sure to rotate your crops each year to prevent the buildup of diseases and pests in the soil.

Walnuts

If you have walnut trees in your garden, avoid planting tomatoes nearby. Walnuts secrete a chemical called juglone that can be toxic to many plants, including tomatoes. Symptoms of juglone poisoning in tomatoes can include yellowing leaves, stunted growth, and reduced fruit production. If you must plant tomatoes near walnut trees, try to keep them at least 50 feet away, or use raised beds with fresh soil to avoid the toxic effects of juglone.

Conclusion

Companion planting can be a great way to maximize the health and productivity of your garden, but it's important to choose your plant combinations carefully. By avoiding these common mistakes and planting your tomatoes next to compatible crops like basil, marigolds, and peppers, you can help your tomatoes thrive and produce a bountiful harvest.