Pea companion plants
Garden peas (*Pisum sativum*) are a cool-season crop with a short productive window in most of the US -- typically March through June, or again in September–October in zones 5–7. They die or go dormant in summer heat. This seasonal window shapes companion planting strategy: pea companions must be.
Garden peas (Pisum sativum) are a cool-season crop with a short productive window in most of the US — typically March through June, or again in September–October in zones 5–7. They die or go dormant in summer heat. This seasonal window shapes companion planting strategy: pea companions must be cool-season compatible.
The primary pest challenges for peas are pea aphids (Acyrthosiphon pisum) and powdery mildew (a fungal disease that becomes severe as temperatures warm). Companion planting addresses aphids with moderate success; it does not address powdery mildew.
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The companion planting table
| Plant | Role | Friend / Foe / Neutral | Notes |
|---|---|---|---|
| Cilantro (Coriandrum sativum) | Aphidius wasp attractor; parasitizes pea aphids | Friend | Succession-sow for continuous bloom |
| Chives (Allium schoenoprasum) | Aphid deterrence; cooler than onion for early season | Friend | Less inhibition of Rhizobium than bulb alliums |
| Spearmint (Mentha spicata) | Some experimental support for pea aphid deterrence | Friend | Plant in containers to prevent spreading |
| Mint (Mentha spp.) | Same as spearmint | Friend | Container-planted only |
| Sweet alyssum (Lobularia maritima) | Syrphid fly support | Friend | Cool-season tolerant; plant at row edges |
| Lettuce | Cool-season; grows efficiently below climbing pea vines | Friend | Perfect space-sharing combination |
| Spinach | Cool-season; complementary height; efficient space use | Friend | Harvest before summer heat |
| Carrots | Compatible root zones; different pest species | Neutral | Traditional kitchen garden pairing |
| Radishes | Mark pea rows early; harvest quickly | Neutral | Mature in 25 days; no pest interaction |
| Corn | Warm-season; timing conflict with peas | Neutral | Won't be in ground at same time in most zones |
| Turnips / beets | Cool-season compatible; no documented pest benefit | Neutral | Space-efficient companions |
| Garlic / onion (bulbing) | Inhibit pea root nodule bacteria (Rhizobium) | Foe | Plant in separate rows; evidence is consistent |
| Fennel (Foeniculum vulgare) | Allelopathic | Foe | Separate beds |
| Tomatoes / peppers | Warm-season; timing conflict; no companion benefit | Foe (irrelevant season) | Will not be in the ground simultaneously in most zones |