No reviewed study supports a specific beneficial companion for asparagus yet. 1 traditional pairing is listed separately because the review found no adequate evidence. 1 popular pairing has no verified relationship, which is not the same as safe or harmful.
Every status below has a direction, mechanism, context and source. "No verified relationship" means we looked and found nothing usable; the planner then evaluates spacing, light, water and timing normally. How we classify evidence →
Traditional claim (1)
Never a hard rule; may appear as an optional experiment.
Traditional claims are shown separately because repetition across charts is not evidence. They never change a planner score; treat them as optional experiments.
TomatoSolanum lycopersicumTraditionalPest suppression · asparagus beetle Asparagus and Tomato affect each other (mutual)Summer · arrangement unspecifiedTier D Review: August 15, 2026Why?
Claim. Tomatoes are said to deter asparagus beetle and asparagus to deter nematodes in tomatoes. No controlled evidence found; asparagus ferns shade summer tomatoes.
Mechanism. Proposed by tradition; not demonstrated in a controlled comparison.
Conditions. Planted together Both plants must be present at the same time.
Applies when. Optional experiment, not a guarantee.
Limitations. Asparagus is permanent and shading.
Evidence. Tier D: Traditional knowledge or structured community observations without a controlled comparison. (tradition).
Reviewed August 15, 2026 by Garden Planner editorial team (pending independent horticultural review). Record tomato--asparagus--pest_suppression v1. Request a correction.
A realistic garden scene where asparagus grows beside a plant with a traditional or unknown relationship.Coexistence in a photograph is not evidence that the plants affect each other.
No verified relationship (1)
Zero score and an honest unknown state. Spacing, light, water and timing are evaluated normally.
No verified relationship: we did not find a source that establishes a benefit or harm for these pairs. This is not the same as "compatible".
ParsleyPetroselinum crispumNo verified relationshipOther Asparagus and Parsley affect each other (mutual)Spring–Fall · arrangement unspecifiedUnknown Review: August 15, 2026Why?
Claim. We did not find a source that establishes a benefit or harm between asparagus and parsley.
Mechanism. None documented.
Conditions. Planted together Both plants must be present at the same time.
Applies when. The planner evaluates spacing, light, water and timing normally.
Limitations. Traditionally paired; no evidence found.
Evidence. Unknown: No source meeting the inclusion rules. (none).
Reviewed August 15, 2026 by Garden Planner editorial team (pending independent horticultural review). Record asparagus--parsley--other v1. Request a correction.
No records match those filters
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Example layout for asparagus
No supported or conditional relationship specifies a layout. Space asparagus at 30–45 cm and plan by light, water and timing.
Side view of asparagus (120–180 cm) beside typical companions, showing canopy, support, shade and access.
When these companions overlap
Bed occupancy in Portland, Oregon (estimates). A relationship only matters while both plants are present.
JFMAMJJASOND
Asparagus
Tomato30 wk overlap
Parsley39 wk overlap
Overlap in weeks
Tomato
30 weeks
Parsley
39 weeks
Crop rotation guidance
Rotation is about what occupied the bed in previous seasons and is calculated separately from the live companion relationships above.
Asparagus is a permanent planting and is not rotated.
No significant light, water, pH or sprawl conflicts with the listed companions at recommended spacing.
Fit checks come from plant attributes and apply even when a pairing has a positive claim.
Community observations (anecdotal)
These reports come from gardeners and are not reviewed evidence. Results vary with soil, climate and practice. Community data never changes an evidence tier or a planner score.
Reports for asparagus: 0 (community submissions open in a later phase; drafts are stored only on your device).
Community-submitted photo area (moderated) with context fields: region, season, layout, varieties, outcome. Record an observation
Reviewer: Garden Planner editorial team (pending independent horticultural review). Status counts on the Companions A–Z page are derived from these records. Corrections.
Documentary and illustrated views distinguish identification, measured layout, seasonal overlap, mechanisms, coexistence examples, and community observations. Captions state what each visual can and cannot establish.
Our Methodology & Sources
We synthesize peer-reviewed research, university extension publications, and trusted horticulture resources. Our evidence levels help you understand how strong the science is behind the guidance.
Evidence tiers
Supported evidenceConsistent results from multiple robust studies
Traditional claimHistorical use reported, limited scientific support
Context dependentMixed or variable results across conditions
No verified relationshipNo reliable evidence identified
