Buckwheat growing profile.

Buckwheat Companion Plants

What may help, what can compete, and where the evidence is still uncertain.

Buckwheat Fagopyrum esculentum

Warm-season cover in the other. View plant profile →

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Quick answer

Evidence supports or conditionally supports growing buckwheat with Cabbage, Cucumber.

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 →

Conditional benefit (2)

Positive only when the stated conditions match; otherwise informational.

CabbageBrassica oleracea var. capitataConditionalSupports beneficial insects · cabbage aphid, cabbage white caterpillars Buckwheat may affect CabbageSpring–Fall · strip · Adjacent strip.Tier C Review: August 15, 2026

Why?

Claim. Buckwheat flowers are strongly attractive to hoverflies and parasitic wasps; a strip beside cabbage may support natural enemies if it flowers during the pest season.

Mechanism. Nectar for natural enemies.

Studied in. Insectary plant field observations. (field)

Conditions. Sow 4–5 weeks before the pest season. Adjacent strip. Flowering buckwheat during the pest period.

Management. Cut before seed set; Resow every 3 weeks.

Applies when. Simple strip experiment.

Limitations. General evidence; no cabbage-specific outcome.

Evidence. Tier C: Indirect evidence: greenhouse or pot work, a related crop or species, or credible extension guidance with important uncertainty. (field trial).

Sources. Hogg 2011; Letourneau 2011

Reviewed August 15, 2026 by Garden Planner editorial team (pending independent horticultural review). Record buckwheat--cabbage--insectary_support v1. Request a correction.

CucumberCucumis sativusConditionalSupports beneficial insects · aphids Buckwheat may affect CucumberSummer · strip · Adjacent strip.Tier C Review: August 15, 2026

Why?

Claim. Buckwheat supports hoverflies and parasitic wasps that may reduce aphids on cucumbers; plausible, untested on cucumber.

Mechanism. Insectary flowers.

Conditions. Sow 4–5 weeks before cucumbers flower. Adjacent strip. Both plants must be present at the same time.

Management. Cut before seed.

Applies when. Experiment.

Limitations. Indirect.

Evidence. Tier C: Indirect evidence: greenhouse or pot work, a related crop or species, or credible extension guidance with important uncertainty. (field trial).

Sources. Hogg 2011

Reviewed August 15, 2026 by Garden Planner editorial team (pending independent horticultural review). Record buckwheat--cucumber--insectary_support v1. Request a correction.

Example layout for buckwheat

Documented arrangement with Cabbage: strip. Adjacent strip. Sow 4–5 weeks before the pest season.

Worked example based on the record, not a photograph of a trial.

**Side view of buckwheat (60–120 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.

Buckwheat

Cabbage15 wk overlap

Cucumber19 wk overlap

Overlap in weeks
Cabbage	15 weeks
Cucumber	19 weeks

Crop rotation guidance

Rotation is about what occupied the bed in previous seasons and is calculated separately from the live companion relationships above.

Rotate buckwheat on a 1-year cycle with other other crops (Okra, Sweet potato, Asparagus, Rhubarb, Blueberry). Shared risks: .

Crop rotation hub · Polygonaceae family page

Physical and resource fit

Cabbage: Buckwheat would shade Cabbage.

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 buckwheat: 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

Evidence summary and sources

Attractiveness of common insectary and harvestable floral resources to beneficial insects — Biological Control, 2011 (field)
Does plant diversity benefit agroecosystems? A synthetic review — Ecological Applications, 2011 (synthesis)

Reviewer: Garden Planner editorial team (pending independent horticultural review). Status counts on the Companions A–Z page are derived from these records. Corrections.

Buckwheat Companion Plants

Quick answer

Conditional benefit (2)

No records match those filters

Example layout for buckwheat

When these companions overlap

Crop rotation guidance

Physical and resource fit

Community observations (anecdotal)

Evidence summary and sources

Related

Visual evidence on this page

Our Methodology & Sources