Some plants simply grow better side by side. Companion planting is the old gardening practice of pairing crops so they help each other, by repelling pests, improving flavour, or making better use of space. If you are trying companion planting for beginners, a few reliable combinations will get you most of the benefit with none of the guesswork.
How companion planting works
Good neighbours help in several ways: strongly scented herbs confuse pests, tall plants shelter shorter ones, flowers draw in pollinators and predatory insects, and deep-rooted plants sit happily beside shallow ones. Learning what to plant together turns a collection of separate crops into a small, cooperative ecosystem.
Classic pairings that work
These vegetable garden companions are time-tested and beginner-friendly:
- Tomatoes + basil: basil is said to improve tomato flavour and helps deter whitefly and aphids.
- Carrots + onions: onions mask the scent that attracts carrot fly, and vice versa.
- Beans + lettuce: beans add nitrogen to the soil while lettuce uses the space between them.
- Cucumbers + nasturtiums: nasturtiums act as a trap crop, luring aphids away.
Plants that repel pests
Several pest-repelling plants earn their place in any bed. Marigolds are the best known, their scent deters aphids and their roots discourage soil pests. Aromatic herbs such as rosemary, thyme and mint (keep mint in a pot, it spreads aggressively) help confuse insects hunting for your vegetables.
Flowers that help the whole garden
Do not overlook flowers. Calendula, borage and cosmos attract bees and hoverflies, whose larvae eat aphids. A border of flowers around a vegetable patch is one of the simplest planting combinations for a healthier, better-pollinated garden.
Combinations to keep apart
A few plants genuinely dislike each other:
- Keep onions and garlic away from beans and peas, they stunt each other.
- Do not plant fennel near most vegetables; it inhibits nearby growth.
- Keep potatoes and tomatoes apart, as close relatives they share the same diseases.
Starting your first companion garden
You do not need a complex companion planting chart to begin. Pick two or three pairings from the lists above, group a few pest-repelling herbs and flowers among your vegetables, and keep notes on what thrives. Each season you will refine your combinations, and your garden will grow stronger, healthier and more productive for it.