Urban gardening transforms balconies and patios into productive green spaces. Companion planting—strategically grouping beneficial plants together—is a powerful technique for planter boxes. It deters pests, improves growth, and maximizes limited space. Here are some excellent combinations to try.
A classic trio is tomatoes, basil, and marigolds. Basil may help repel pests like aphids and improve tomato flavor, while marigolds deter nematodes in the soil. For leafy greens, plant lettuce or spinach with chives or garlic; their strong scent can confuse pests. Radishes grow quickly alongside slower-growing carrots, helping to break up the soil.
Herbs are fantastic companions. Rosemary and sage can help protect cabbage-family plants like kale from caterpillars. Avoid planting dill near tomatoes, as it can attract tomato hornworms. For vertical interest, grow pole beans with low-growing herbs like oregano or thyme. Nasturtiums are excellent "trap crops," attracting aphids away from your vegetables, and their flowers are edible.
Remember to group plants with similar needs for sunlight and water. Ensure your planter boxes have adequate drainage and depth for root growth. By thoughtfully pairing plants, you create a resilient, mini-ecosystem that yields a more abundant and healthy harvest from your urban oasis.