Snap Peas are one of those crops that reward a little planning before a single seed goes in. Snap peas climb a trellis on curling tendrils and produce crisp, edible pods that are eaten whole. They are hardy and direct-sown, maturing in 60–70 days, and they prefer cool spring weather. The companions you choose decide whether that bed works hard all season or sits half empty while one crop slowly does its thing.
Our crop data lists four companions for snap peas — marigolds, basil, onions and lettuce — and each earns its place for a different reason. Pods are picked as soon as they are plump and sweet, before the peas inside get starchy. This guide covers the four companions, the plants to avoid, and a layout for full sun, soil pH 6.0–7.5 and 60–70 days to maturity.
Best companion plants for snap peas
| Companion | Why it is grown with snap peas |
|---|---|
| Marigolds | Gardeners plant marigolds at the ends of bean and pea rows. The strong scent is traditionally said to confuse pests such as aphids that hunt by smell, and they never compete for the trellis. |
| Basil | Basil goes in after the last frost at the sunny end of a bean or pea row. Its scent is traditionally said to confuse flying pests, and its flowers attract pollinators. |
| Onions | Onions are slim and shallow-rooted, so they fit along the edge of a bean or pea row without competing for the trellis. Their strong smell is traditionally said to confuse pests such as aphids. |
| Lettuce | Lettuce grows at the foot of a pea or bean row and is cut before the legumes need the light. It shades the soil and uses the lower layer the climbing crop never uses. |
None of the four fights snap peas for the same layer of the bed: marigolds and basil work the sunny edges, onions use the shallow soil between plants, and lettuce fills the gaps and is gone before the main crop needs the room.
If you only have room for one companion, plant marigolds: they are the most forgiving of the four and flower for months. If you have room for two, add lettuce — it is ready in weeks and turns empty gaps into food while you wait for the main crop.
How companion planting works
Companion planting is not magic. Some pairings help a little, in specific ways, and the best gardeners use them as one tool among many — alongside rotation, spacing, watering and keeping the bed clean.
The first principle is pest confusion. Many pests find their host plant by smell, and a strongly scented neighbour such as marigolds, basil or onions is traditionally said to make the crop harder to find. That is a traditional claim, not a proven guarantee: it may reduce damage, it will not eliminate it.
The second principle is pollinator attraction. Flowers such as marigolds and basil, once they bloom, bring bees and hoverflies into the bed — and hoverfly larvae eat aphids. Let a little basil flower rather than pinching every stem.
The third principle is nitrogen fixing by legumes. Peas and beans work with soil bacteria to fix nitrogen from the air. This crop is itself a legume, so it fixes nitrogen too — a useful bonus for whatever follows it in the bed.
The fourth principle is ground cover. A low, fast crop such as lettuce shades bare soil, holds moisture in, and suppresses weeds — which matters for a crop with moderate water needs growing in full sun. A living mulch does the same job as straw, and you can eat it.
Plants to avoid near snap peas
The crops to keep away from snap peas are its own relatives. Snap Peas belong to the Fabaceae family, and plants in the same family tend to attract the same pests and suffer the same diseases — in this case aphids, bean beetles, slugs, cutworms. Planting relatives side by side gives those pests a continuous buffet and leaves the same nutrients depleted in one patch of soil. So do not plant snap peas next to Green Beans, Peas, Lima Beans, Snow Peas, Edamame, Sweet Peas, and do not follow snap peas with any of them in the same bed next year. Rotate the whole family to a fresh bed instead.
Planting layout and spacing
| Growing factor | What snap peas need |
|---|---|
| Sun | full sun |
| Soil pH | 6.0–7.5 |
| Days to germination | 7–14 |
| Days to maturity | 60–70 |
| Spacing | 2–3 inches |
| Water needs | moderate |
| Cold tolerance | hardy |
| Sowing method | direct sow |
| Family | Fabaceae |
Start with the spacing: snap peas need 2–3 inches between plants, and that figure is for the mature plant, not the seedling. Mark the rows out before you sow, and use our plant-spacing calculator or the square-foot garden planner to work out how many plants your bed holds. Crowding is the commonest mistake in a companion bed.
Put the companions where they belong: marigolds at the ends of rows and along the sunny edge, basil at the sunniest edge after the last frost, onions tucked between plants, and lettuce filling the gaps in succession. Nothing should be planted so close that it shades snap peas or blocks airflow — damp, still air is where disease starts.
Aim for a soil pH of 6.0–7.5, with plenty of well-rotted compost worked in before planting. Water needs are moderate, so keep the soil evenly moist and mulch to hold that moisture in. The watering calculator gives a starting point for your bed size.
Common problems and fixes
| Problem | What to do |
|---|---|
| Aphids | Spray off with a strong jet of water, encourage ladybirds and hoverflies, and remove badly curled leaves. |
| Bean beetles | Hand-pick beetles and larvae, remove damaged leaves, and rotate beans to a fresh bed next year. |
| Slugs | Water in the morning, clear debris where slugs hide, and hand-pick at dusk or set simple beer traps. |
| Cutworms | Fit cardboard collars around young stems, keep the bed weed-free, and check at the soil line each morning. |
| Poor germination in cold soil | Wait until the soil is warm before sowing, and do not waterlog the seed. |
| Plants stopping in summer heat | Sow early for cool-season peas, and give beans steady water while pods are filling. |
Aphids
Aphids are listed among the common pests of snap peas in our crop data, so check for them weekly rather than waiting for visible damage. Spray off with a strong jet of water, encourage ladybirds and hoverflies, and remove badly curled leaves.
Bean beetles
Bean beetles are the second pest to watch for on snap peas. Hand-pick beetles and larvae, remove damaged leaves, and rotate beans to a fresh bed next year.
Slugs
Slugs are another problem that shows up on snap peas, often a sign of the growing conditions rather than bad luck. Water in the morning, clear debris where slugs hide, and hand-pick at dusk or set simple beer traps. If it keeps returning in the same bed, rotate snap peas to a fresh bed next year. Our pest-identifier helper can help confirm what you are looking at.
Frequently asked questions
What is the best companion plant for snap peas?
Marigolds are the safest first choice: they suit every bed and flower all season. After them, pick from the table above — lettuce for quick gaps, onions for narrow edges, basil for a sunny border.
Can I plant snap peas with lettuce?
Yes. Lettuce is listed as a companion for snap peas in our crop data, and it is one of the most useful gap-fillers in the garden. Sow it between the plants, cut it young, and it will be finished before the main crop needs the space.
What should I not plant near snap peas?
Avoid its own family. They share the Fabaceae family, so they share the same pests (aphids, bean beetles, slugs, cutworms) and the same soil demands. Keep the family apart in the same season and rotate it to a different bed next year.
How far apart should I plant snap peas and its companions?
Give snap peas its full spacing of 2–3 inches — crowding is the commonest cause of small harvests. Companions go in the gaps, at the edges or between rows, but never so close that they shade or crowd the main crop. Our plant-spacing calculator works out how many plants fit your bed.
When should I plant the companions?
Sow or set out the companions at the same time as the main crop, or just after. Marigolds and basil are tender, so they go in after the last frost, even if the main crop went in earlier. Check dates with our frost-date calculator.