Asparagus Companion Plants
Vegetable2 years to establish
Asparagus is a long-lived perennial vegetable that can crop for 15-20 years once established from crowns set in a deep trench. Because the bed stays in place for decades, permanent companions and good site choice matter more than with annual crops. Its signature pest is the asparagus beetle, which chews spears and ferns and lays dark eggs along the stalks.
Companion Checker: what grows well with Asparagus?
Tap any plant to see whether it pairs well with Asparagus and why. Green means a beneficial companion, red means keep them apart.
Want to lay out a whole bed? Open the full drag-and-drop companion planting tool →
Companion Planting Strategy for Asparagus
Since an asparagus bed is permanent, it suits companions that also stay put or that actively protect it, especially plants said to repel asparagus beetles and root nematodes. Pairings work best with deep-rooted or aromatic neighbors, while shallow-rooted alliums are traditionally kept out of the bed.
Best Companion Plants for Asparagus
These plants grow well alongside Asparagus — providing pest control, attracting pollinators, or making better use of your garden space.
Tomatoes give off solanine that helps repel asparagus beetles, while asparagus releases a substance that deters the root-knot nematodes that attack tomatoes, making them a classic mutual-benefit pair.
Parsley is a traditional asparagus companion thought to boost vigor, and its flowers attract beneficial insects that prey on asparagus beetles.
Basil's strong aroma helps repel asparagus beetles, and like parsley it pairs well in the same bed without competing for the asparagus crowns' deep root zone.
What Not to Plant With Asparagus
Keep these away from Asparagus. They compete for resources, attract shared pests, or inhibit each other's growth.
Onions and other alliums are traditionally kept away from asparagus because their shallow roots compete with the crowns and they are believed to inhibit asparagus growth.
Garlic, like other alliums, is thought to stunt asparagus and competes at the soil surface, so it is kept out of the permanent asparagus bed.
How to Grow Asparagus
- Botanical name
- Asparagus officinalis
- Family
- Asparagus (Asparagaceae)
- Sun
- Full sun, 6-8+ hours daily
- Water
- 1-2 inches per week, especially during spear and fern growth
- Soil
- Deep, loose, well-draining soil rich in organic matter, pH 6.5-7.5
- Spacing
- 12-18 inches apart; rows 4-5 feet
- Planting depth
- Set crowns 6-8 inches deep in a trench, backfilling gradually as shoots grow
- Germination
- Usually grown from crowns; seed germinates in 2-8 weeks at 70-80F
- Days to maturity
- 2-3 years from planting before the first full harvest
- When to plant
- Plant dormant crowns in early spring as soon as soil can be worked; sow seed indoors in late winter
- Harvest
- Snap or cut spears at 6-8 inches for about 2-3 weeks in year two and up to 6-8 weeks once established; then let ferns grow
Common Asparagus Problems
Asparagus beetle (beetles and gray larvae chewing spears and ferns)
Handpick beetles and dark eggs daily, encourage ladybugs and lacewings, cut and remove ferns in fall, and use spinosad for severe outbreaks.
Fusarium crown and root rot (yellowing, wilting ferns and declining stand)
Plant disease-free crowns in well-draining soil, avoid waterlogging, keep beds weed-free, and start a new bed in fresh ground if rot takes hold.
Asparagus rust (reddish-brown pustules on stems and ferns)
Choose resistant varieties, space rows for good airflow, avoid overhead watering, and remove and destroy infected ferns at season's end.
Thin, spindly spears (declining vigor from over-harvest or poor feeding)
Stop cutting once spears drop below pencil thickness, top-dress with compost, keep beds weeded, and let the ferns grow to recharge the crowns each year.
Asparagus Companion Planting FAQ
What are the best companion plants for asparagus?
Tomatoes are the classic match, repelling asparagus beetles while the asparagus deters the nematodes that attack tomatoes, and parsley and basil add pest-confusing aroma and draw beneficial insects. Dill, coriander, and marigolds also help protect the permanent bed.
What should you not plant with asparagus?
Keep onions, garlic, and other shallow-rooted alliums out of the asparagus bed, since they compete with the crowns and are traditionally believed to stunt asparagus. Avoid crowding the long-lived bed with aggressive annual feeders as well.
How long until asparagus is ready to harvest?
Wait until the second year for a light cut and the third year for a full harvest, so the crowns can build strength first. After that an established bed can produce for 15-20 years with light annual feeding.
How deep do you plant asparagus crowns?
Set crowns in a trench about 6-8 inches deep, spreading the roots over a small mound, then backfill gradually as the shoots grow through the season. This deep planting anchors the long-lived crowns and protects them from cold and cultivation.
More vegetable companions
Plan Your Asparagus Garden
Use our interactive tools to design the perfect garden with Asparagus and its companions.