Technically not a vegetable, but still important: Black walnut trees release a toxin called juglone from their roots, leaves, and shells. Juglone can cause tomato plants to wilt, yellow, or die. Keep tomatoes at least 50 feet away from any walnut tree.
8. Broccoli & Cauliflower (Again!)
It’s worth repeating—these two are not tomato-friendly. Besides nutrient competition, they can attract shared pests, like aphids and cabbage worms. Rotate their location away from tomatoes each season.
9. Cabbage (All Varieties)
Yes, cabbage is back on the list too. Whether it’s green cabbage or Napa, it competes with tomatoes and brings unwanted pests. Keep a safe distance between these crops to protect both from stress.
10. Corn (Double Trouble)
Corn deserves another warning because it creates dense shade and houses pests that thrive in tomato crops—especially cutworms and earworms. Tomatoes do best in full sun with open space. Don’t crowd them with tall, nutrient-hungry plants.
🌱 Gardening Smarter: Tips for Companion Planting with Tomatoes
If you’re planting tomatoes, choose good companions like:
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Basil – enhances flavor and repels pests
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Marigolds – keep nematodes and whiteflies away
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Carrots – help break up soil without crowding
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Lettuce and spinach – shallow roots won’t compete
Give tomatoes space, airflow, and plenty of nutrients—and keep harmful neighbors away!
✅ Final Thoughts
Tomatoes can be sensitive, but with the right garden layout, they’ll reward you with juicy, vibrant fruit all summer long. Avoid planting these 10 veggies nearby, and you’ll reduce the risk of disease, pests, and poor harvests. Want a thriving tomato patch? Choose companions wisely—and give them room to shine.
