The Three Sisters method combines sweetcorn, climbing beans and squash, with the corn providing support and the squash shading the ground. It is an intriguing companion-planting project with a generous, informal look. In the cooler UK climate it can be tricky, as sweetcorn and squash need a long warm summer, so use a sheltered sunny site and treat it as an experiment.

What to grow in a Three Sisters Garden

How to design it

Choose the warmest, most sheltered part of the garden and prepare a broad, fertile bed with plenty of garden compost. Plant sweetcorn in a block rather than a single row to improve pollination, spacing plants about 45 cm apart. Once corn is established and roughly 20 cm tall, sow climbing French beans nearby, giving them corn stems to climb. Plant pumpkins or courgettes around the outside, using one vigorous squash crop rather than both in a small plot. Keep a clear path around the block for watering and harvesting, and add extra supports if beans outgrow the corn.

Care through the season

Sow or plant only after frost risk has passed and the soil has warmed. Water deeply in dry spells, particularly while sweetcorn is flowering and squash fruits are swelling. Hand-pollinate sweetcorn by gently shaking plants on still days if pollination looks poor. Tie bean shoots to temporary canes if needed, harvest beans young, and remove tired foliage. Protect young plants from cold winds and slugs.

Tips

This combination is less dependable in cool, wet UK summers than in warmer climates, so choose early sweetcorn and compact squash varieties. Do not overcrowd the plants: good light and airflow matter more than copying a strict pattern. A greenhouse or warm wall may be better for pumpkins in colder areas.

Planning a Three Sisters Garden: frequently asked questions

How do I design a three sisters garden?

Choose the warmest, most sheltered part of the garden and prepare a broad, fertile bed with plenty of garden compost.

How do I care for a three sisters garden through the season?

Sow or plant only after frost risk has passed and the soil has warmed.

What are some tips for a three sisters garden?

This combination is less dependable in cool, wet UK summers than in warmer climates, so choose early sweetcorn and compact squash varieties.

General planning ideas for UK gardens; adjust plant choices to your space and local conditions. Page updated 19 Sep 2026.