Peppers Companion Plants
Peppers need the warmest, brightest position available in the UK and often produce best in a greenhouse, polytunnel or sheltered patio. Companion planting can make efficient use of containers and borders, but it will not compensate for low light or cold nights. Choose compact neighbours that do not compete for warmth, water or root room.
Good companions for Peppers
| Plant | Why it helps |
|---|---|
| Basil | Basil enjoys similar warmth under cover and makes a compact companion, provided both plants receive enough light. |
| French marigolds | French marigolds add flowers that may encourage beneficial insects in a greenhouse or sunny container display. |
| Pot marigolds | Pot marigolds can flower beside outdoor peppers and help make a mixed border more attractive to insects. |
| Spring onions | Their narrow upright leaves take little root space and can be harvested before peppers become bushy. |
| Lettuce | Lettuce can use shaded soil below young peppers, especially early in the season before foliage closes. |
| Radish | Fast radishes are useful temporary fillers in large containers or greenhouse borders before pepper roots expand. |
| Carrots | Carrots have a different root and canopy pattern, but both crops need generous spacing and steady watering. |
Keep Peppers away from
| Plant | Why to separate them |
|---|---|
| Fennel | Fennel is vigorous and traditionally kept separate from many vegetables because it can dominate limited growing space. |
| French beans | Dense bean growth may shade peppers and compete for support, warmth and water in a greenhouse. |
| Courgette | Courgettes become large, thirsty plants and can quickly overwhelm peppers in a sheltered UK growing space. |
| Potatoes | Keeping potatoes separate can simplify crop management, as both may attract aphids and need good airflow. |
Tips
Start plants early under cover or buy sturdy young plants, then move outside only after frost risk has passed. In a greenhouse, ventilate on hot days and water regularly without soaking leaves. Feed and support plants according to their vigour, pinch out only if your chosen variety benefits, and keep an eye out for aphids. Avoid overcrowding.
Peppers companion planting: frequently asked questions
What are good companion plants for peppers?
Good companions for peppers include Basil, French marigolds, Pot marigolds, Spring onions, Lettuce, Radish, Carrots.
What should you not plant near peppers?
Keep peppers away from Fennel, French beans, Courgette, Potatoes.
How does companion planting help peppers?
Peppers need the warmest, brightest position available in the UK and often produce best in a greenhouse, polytunnel or sheltered patio.
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Companion planting is a traditional practice; results vary with your climate, soil and garden. Page updated 19 Sep 2026.