Turnip benefits significantly from companion planting. The plant's main challenges — Flea Beetle and Aphid pressure, and the pollination needs that drive fruit set — are directly addressed by the right neighboring plants. Below are the companions with the strongest evidence, their specific benefits, recommended spacing, and the plants to keep turnip away from.
Companion Planting for Turnips
Published: April 21, 2026
Best Companions for Turnips
| Companion | Benefit | Spacing |
|---|---|---|
| Pea | Beneficial pairing with turnip | 12–18 in |
| Mint | Beneficial pairing with turnip | 12–18 in |
| Rosemary | Repels cabbage moth, carrot fly, and bean beetles | 18–24 in |
| Thyme | Repels whitefly and cabbage worm; general pest deterrent | 12 in |
| Onion | Sulfur compounds repel carrot fly, aphids, and fungal disease | 6 in |
Plants to Avoid Near Turnips
| Avoid | Reason |
|---|---|
| Potato | Same family (Solanaceae) — share blight and pest pressure; compete for nutrients |
| Radish | Competes with turnip or shares pest pressure |
Turnips in a Raised Bed — Layout
In a standard 4×8 raised bed with turnip as the main crop, plant 4-inch spacing for the primary crop and interplant Pea, Mint, and Rosemary around the edges and between rows. Keep Potato in a separate bed to avoid the competition and disease pressure those pairings create.
When to Plant Companions with Turnips
Plant pea with turnip in the cool-season window — both prefer temperatures in the 55 to 70°F range. Cool-season companions can go in at the same time as direct-sown turnip (soil at 40°F minimum) or 1 to 2 weeks ahead of transplants. Herb companions like rosemary and chives are perennials that stay in place year-round. Interplant fast cool-season companions (radish, lettuce) between rows for a quick 30 day harvest before the main crop fills in.
Companion Planting & Turnip Pest Control
Turnip’s most common pests — Flea Beetle, Aphid, Cabbage Root Maggot — are directly addressed by the right companions. Pea provides general pest deterrence. Mint adds a second defense — benefiting the main crop. These effects are strongest when the companion is planted within 18 inches of the main crop, and when multiple companion species are layered together rather than used singly. Beneficial insects (hoverflies, parasitic wasps, ladybugs) drawn in by companion flowers provide additional control against aphids and caterpillars — flowering companions like dill, borage, and marigold all attract these predators.
Frequently Asked Questions
What is the best companion plant for turnip?
Pea is the best all-around companion for turnip — it supports growth and pest resistance. Plant pea 12–18 inches from turnip for the strongest effect. Mint is a close second — providing complementary benefits.
What should I not plant near turnip?
Avoid Potato and Radish. Potato same family (solanaceae) — share blight and pest pressure; compete for nutrients. Keep these at least 6 feet from your turnip or plant them in a separate bed to avoid the competition and shared pest pressure.
Can I grow turnip and potato in the same garden?
Yes, in separate beds. Potato and turnip same family (solanaceae) — share blight and pest pressure; compete for nutrients, but placing them 6+ feet apart with a buffer of other crops usually prevents problems. Rotation is also important — don't plant the same family in the same bed two years in a row.
How far apart should companion plants be from turnip?
Pest-deterrent companions like pea work within 12 to 18 inches of turnip. Nitrogen-fixing legumes work at 18 to 24 inches. Trap crops (nasturtiums, for example) need 18+ inch spacing so pests congregate on the trap rather than the main crop. Flowering companions for pollinator attraction can be anywhere in the bed — their bee-attracting effect reaches 10 to 20 feet.
Does companion planting help with flea beetle on turnip?
Yes, for the specific companions that target Flea Beetle. Pea and Mint are documented flea beetle deterrents and should be planted within 18 inches of turnip. Companion planting is one part of integrated pest management — combine it with floating row covers during peak flea beetle season and hand-picking for best results.