Tomatoes and onions can be grown side by side without causing problems. Onions don’t compete much for nutrients, and they help keep pests like aphids and beetles away from tomato plants. You don’t need a special setup—just make sure tomatoes have enough space to grow and climb, while onions stay low and compact. It’s a practical way to save space and improve garden health. Onions mature earlier, so once harvested, they leave more room for tomato roots to expand. This pairing works well in mixed beds and is easy to manage with regular watering and basic care.
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