Companion Planting in the South: What Grows Well Together

Why Companion Planting Works

Companion planting is the practice of growing different plants close together for mutual benefit. Some combinations deter pests, others improve soil, some attract beneficial insects, and a few simply make efficient use of limited garden space. Southern gardeners can take advantage of companion planting throughout the year because of the long growing season and the diversity of crops that can grow simultaneously.

Not every companion planting claim holds up to scrutiny, but the ones covered in this guide have solid track records in actual gardens, not just gardening lore.

The Three Sisters: Corn, Beans, and Squash

The Three Sisters combination is one of the most famous companion plantings in North America, developed by Indigenous peoples over thousands of years. Corn provides a structure for beans to climb. Beans fix nitrogen in the soil that feeds the corn and squash. Squash spreads across the ground, shading out weeds and keeping the soil cool and moist. In the South, this combination works beautifully as a summer planting when all three crops are in season.

Plant corn first and let it get 4 to 6 inches tall before adding beans and squash. Give the whole planting extra room since squash vines spread aggressively.

Tomatoes and Basil

The tomato and basil pairing is beloved in Italian cooking and many gardeners swear it improves tomato flavor while repelling certain insects. Whether or not basil genuinely repels tomato pests, they do share the same season, the same general care requirements, and they look great together. Interplanting basil among tomatoes makes full use of the space between plants and gives you both crops in one bed.

Marigolds Throughout the Southern Garden

French marigolds are among the most useful companion plants for a southern vegetable garden. They produce compounds from their roots that suppress root-knot nematodes, a serious soil pest in Florida and the Gulf Coast. They attract beneficial insects that prey on aphids and other garden pests. And their strong scent confuses and deters many flying insects. Plant marigolds generously throughout your vegetable garden as a border and as an interplanted companion with tomatoes, peppers, and squash.

Nasturtiums as Trap Crops

Nasturtiums are willing hosts for aphids, which means they serve as trap crops, drawing aphids away from your vegetables. Plant nasturtiums at the edges of your garden or near vulnerable crops like beans and peppers. Check them regularly and remove aphid-covered stems. The flowers and leaves are also edible, adding a peppery kick to salads.

Beans and Almost Everything

Nitrogen-fixing legumes like beans and Southern peas improve soil fertility for neighboring plants. They work well planted alongside heavy feeders like corn, tomatoes, and squash. Avoid planting beans near onions or garlic, which appear to inhibit bean growth.

Herbs as Garden Companions

Many herbs serve as effective pest deterrents when interspersed throughout the garden. Lemongrass planted at garden borders deters some insects with its strong citrus scent. Rosemary near brassicas may deter cabbage moths. Dill and fennel attract beneficial wasps that parasitize caterpillars. However, keep fennel away from most vegetables since it tends to inhibit neighboring plant growth.

Build Your Best Southern Garden

Smart planting combinations are just one part of a productive southern garden. For a structured approach to building a diverse, year-round food garden in Florida and the Gulf South, the Florida Beginner's Starter Bundle gives you the foundational knowledge and specific plant guidance to get your garden growing right from the start.