Sweet Potatoes Companion Plants
Sweet potatoes are tender, frost-sensitive crops that need a warm, lengthy season. In Britain they are most dependable in a greenhouse, polytunnel, raised bed with protection, or a large container in a sheltered sunny spot. Their spreading stems need room, and companion planting offers no guaranteed gains in pest control or tuber yield.
Good companions for Sweet Potatoes
| Plant | Why it helps |
|---|---|
| French marigolds | French marigolds can grow at the edge of a large container or warm bed, adding flowers without competing strongly once established. |
| Basil | Potted basil suits the same protected summer conditions and remains movable if sweet potato stems begin covering nearby space. |
| Spring onions | Spring onions are upright, shallow-rooted companions for bed edges and can be harvested before sweet potato vines spread widely. |
| Lettuce | Lettuce can use bare space early in the season, but remove it once trailing stems reduce light and airflow. |
| Borage | Borage flowers may attract insects around a sheltered plot, but grow it at a distance because its foliage is large. |
| Pot marigolds | Pot marigolds offer easy-to-grow flowers around a warm bed; their direct benefit to sweet potato performance is unproven. |
Keep Sweet Potatoes away from
| Plant | Why to separate them |
|---|---|
| Courgettes | Courgettes and sweet potatoes both spread widely, so their foliage can quickly compete for light, access and watering space. |
| Melons | Melons need the same warm protected area and their vigorous vines make a cramped greenhouse or bed difficult to manage. |
| Potatoes | Potatoes need different harvesting timing and share valuable bed space; growing both together complicates lifting and crop rotation. |
Tips
Plant slips only after frost risk has passed and soil or compost has warmed well. Give each plant a large container or about 45 cm of space, then guide trailing stems so they do not smother neighbours. Water during establishment and dry spells, but avoid constantly saturated compost. Lift before cold autumn weather, curing tubers somewhere warm and dry.
Sweet Potatoes companion planting: frequently asked questions
What are good companion plants for sweet potatoes?
Good companions for sweet potatoes include French marigolds, Basil, Spring onions, Lettuce, Borage, Pot marigolds.
What should you not plant near sweet potatoes?
Keep sweet potatoes away from Courgettes, Melons, Potatoes.
How does companion planting help sweet potatoes?
Sweet potatoes are tender, frost-sensitive crops that need a warm, lengthy season.
← All companion planting guides
Companion planting is a traditional practice; results vary with your climate, soil and garden. Page updated 19 Sep 2026.