Companion Plant Guide
Tomato
Tomatoes help deter asparagus beetle.
Vegetable · Asparagus family
Asparagus companion plants
Asparagus officinalis
What to plant with asparagus, what to keep apart, and how to grow it — sun, spacing, soil and the reason behind every pairing.
Photo: Keegan Houser on Unsplash
Overview
Growing asparagus beside the right neighbour
Asparagus (Asparagus officinalis) is a vegetable in the Asparagus family. Long-lived perennial vegetable harvested as spring spears.
An asparagus bed can crop for 15–20 years, so choose neighbours that will not crowd the crowns.
Give plants 12–18 in in full sun. Aim for deep, well-draining sandy loam, ph 6.5–7.5. In most gardens the crop sits in USDA zones 3-8 and is ready in about 730+ days (first harvest in year 2-3).
Grows well with
What to plant with asparagus
The best companion plants for asparagus in this guide are Tomato, Parsley, Marigold, and Basil. Each pairing below is a reason to share a bed — pest masking, roots that do not compete, or insects that hunt the pests drawn to asparagus.
Parsley
Draws in predatory insects that hunt asparagus beetle.
Marigold
Repels asparagus beetle.
Basil
Aromatic cover said to deter asparagus beetle.
Keep apart
What not to plant with asparagus
Keep asparagus away from Onion and Garlic. These neighbours compete for the same food, release chemicals that stunt growth, or otherwise hold the crop back.
Onion
Alliums are said to stunt asparagus crowns.
Garlic
Alliums are said to stunt asparagus crowns.
In the bed
How to grow asparagus
| Sun | Full sun |
|---|---|
| Spacing | 12–18 in |
| Soil | Deep, well-draining sandy loam, pH 6.5–7.5 |
| Hardiness | Zones 3-8 |
| Days to maturity | 730+ (first harvest in year 2-3) |
These notes sit beside the companion lists — they are how asparagus actually occupies the bed, not a substitute for local climate.
- Plant one-year crowns in a trench and backfill as they grow
- Do not harvest in the first year; pick lightly in year two
- Stop cutting when spears thin to pencil width
- Leave the ferns standing until they yellow in autumn
Questions
Asparagus companion planting FAQ
What can I plant next to asparagus?
Plant Tomato, Parsley, Marigold, and Basil beside asparagus. Tomato: Tomatoes help deter asparagus beetle. Parsley: Draws in predatory insects that hunt asparagus beetle. Marigold: Repels asparagus beetle. Basil: Aromatic cover said to deter asparagus beetle.
What should I not plant with asparagus?
Keep asparagus apart from Onion and Garlic. Onion: Alliums are said to stunt asparagus crowns. Garlic: Alliums are said to stunt asparagus crowns.
How much sun do asparagus plants need?
Asparagus plants want full sun. Space them 12–18 in apart in deep, well-draining sandy loam, ph 6.5–7.5.
How long do asparagus plants take to mature?
Most asparagus plants are ready in about 730+ days (first harvest in year 2-3). Asparagus grows in USDA hardiness zones 3-8.
Compare every pairing at a glance
Open the guide, pick asparagus, and see what thrives alongside it — and what quietly holds it back.
Open the pairing guide