In the world of gardening, not all plants make ideal neighbors. Tomatoes, while versatile and popular, have specific companions they thrive with and others that can hinder their growth. In this blog, we’ll explore seven companion plants you should steer clear of when cultivating tomatoes to ensure a bountiful harvest.
1. Brassicas: Cabbage, Broccoli, Cauliflower, and Kale
Why? These vegetables, part of the brassica family, share similar diseases with tomatoes, such as early and late blight. The risk of disease transmission between them is high, and their competition for nutrients in the soil can affect the overall health of both crops.
2. Potatoes: Nightshade Kin with Similar Susceptibilities
Why? Potatoes and tomatoes belong to the nightshade family, making them susceptible to comparable diseases like blight and potato scab. Planting them in close proximity increases the likelihood of both crops falling prey to these common problems.
3. Eggplant: Nightshade Twins with Shared Vulnerabilities
Why? While visually appealing together, eggplant and tomatoes are both nightshades, sharing vulnerabilities to overlapping diseases. Additionally, eggplants attract the Colorado potato beetle, a harmful pest detrimental to both plants.
4. Fennel: Growth-Stunting Herb Neighbor
Why? This feathery herb emits a chemical that can stunt the growth of tomato plants. To ensure the robust development of your tomatoes, it’s advisable to keep fennel several feet away from your tomato patch.
5. Dill: Conflicting Pest-Repelling Claims
Why? While some gardeners believe dill is a beneficial companion for tomatoes due to its alleged pest-repelling properties, research suggests the opposite. It’s best to exercise caution and keep dill away from your tomato plants.
6. Corn: Mismatched Watering Needs
Why? Despite seeming like a classic summer pairing, corn and tomatoes have divergent watering needs. Corn requires frequent, deep watering, potentially leading to overwatering for tomatoes. This excess moisture can cause root rot, posing a threat to tomato plants.
7. Walnuts: Inhibiting Growth with Juglone
Why? The majestic walnut tree releases juglone, a chemical compound that can inhibit the growth of many plants, including tomatoes. If you have a walnut tree, it’s crucial to plant your tomatoes far away from its root zone to avoid detrimental effects on their development.