Graham FisherBy Graham Fisher

Updated November 2026

A good vegetable garden layout companion planting plan puts compatible crops close together, keeps tall plants from shading sun-loving neighbors, and separates crops that compete for the same nutrients or attract the same pests. By the end of this guide, you will be able to sketch a bed map, pick pairings that work, and set spacing so every plant has room to grow.

Start With Sun, Access and Bed Orientation

Before you think about pairings, map where the sun falls. In most of the US, beds should run north to south so both sides get even light. Place tall crops such as pole beans, staked tomatoes and sweet corn on the north edge of the bed so they do not shade shorter plants. Leave a 12-to-18-inch path between beds for access, and keep harvest crops like peppers and herbs within easy reach of that path.

Shopping for one? See our guide: 6 Best Garden Layout Free Printable Printable Companion Planting Charts (2026): Our Picks.

Group Crops by Family and Nutrient Needs

Plants in the same family share pests and diseases, so keep them apart. The nightshades (tomatoes, peppers, eggplant, potatoes) should not sit next to each other, and the brassicas (broccoli, cabbage, kale) should be spread out as well. Pair heavy feeders like tomatoes, squash and corn with light feeders such as lettuce, radishes and bush beans. Beans fix nitrogen in the soil, so planting them near corn or brassicas gives those hungry crops a small boost. A related read: Plan for a Companion Planting Garden Design: 7 Steps to Layout Beds.

Useful Companion Pairs

  • Tomatoes and basil: basil is commonly planted nearby, and many gardeners grow the two together for convenience at harvest.
  • Carrots and onions: onion scent is often said to deter carrot rust fly, so the two are frequently interplanted.
  • Corn, beans and squash: the classic Three Sisters arrangement uses corn as a trellis and beans for nitrogen, with squash shading the soil.
  • Radishes between slow crops: radishes mature in about 25 to 30 days, so they can mark rows of carrots or parsnips before those crops fill in.

Set Spacing and Plan Succession

Crowding is the most common layout mistake. Use the spacing on your seed packet as a minimum, and remember that companion plants still need light and airflow. The table below gives typical starting spacings for common crops in a standard raised or in-ground bed.

Crop Plant spacing Good neighbors
Tomato (staked) 18 to 24 inches Basil, carrots, marigold
Bush bean 4 to 6 inches Corn, cucumber, carrots
Lettuce 6 to 8 inches Carrots, radish, strawberries
Squash 24 to 36 inches Corn, nasturtium

Plan succession too. When radishes come out in late spring, drop bush beans or a second lettuce planting into the gap. Sketching the bed on graph paper, with one square per 6 inches, makes these shifts easier to track across the season.

Common Mistakes

  • Planting tomatoes and potatoes together, which shares blight risk.
  • Putting fennel near most crops, since it tends to inhibit growth in neighbors.
  • Ignoring mature size and planting seedlings too close because they look small.
  • Forgetting to rotate beds, so the same family returns to the same spot every year.
  • Trusting every companion claim; many pairings are traditional rather than tested, so observe your own garden.

A soil thermometer helps you time sowing for warm-season crops, since tomatoes and squash grow best once soil reaches about 60 to 65°F. View on Amazon

A tape measure or a set of garden spacing stakes keeps rows and plant intervals consistent across the bed. View on Amazon

FAQ

Do companion plants really reduce pests?

Some pairings appear to help, such as marigolds drawing certain insects, but results vary widely. Treat companion planting as one tool alongside crop rotation, healthy soil and regular inspection.

How far apart should I put companion plants?

They can sit directly next to each other if both have room to grow. Follow each crop’s mature spacing first, then fit companions into the gaps.

Can I use a companion layout in containers?

Yes. Choose a container at least 12 inches deep for most vegetables, and pair a tall crop like tomato with a shallow-rooted herb such as basil or parsley.

Conclusion

A successful vegetable garden layout companion planting plan starts with sun and bed orientation, groups crops by family and nutrient needs, and respects mature spacing. Sketch your bed before planting, note your pairings, and adjust after each season based on what thrives.

Ready to choose one?

Graham Fisher

About Graham Fisher

Graham Fisher is part of our editorial team and reviews and edits our vegetable & edible gardening guides, checking product details against manufacturer specifications and owner feedback.