No reviewed study supports a specific beneficial companion for kohlrabi 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 lycopersicumTraditionalFlavour or growth claim Kohlrabi and Tomato affect each other (mutual)Summer · arrangement unspecifiedTier D Review: August 15, 2026Why?
Claim. Kohlrabi and tomatoes are traditionally said to stunt each other. No evidence found for either direction.
Mechanism. Claimed by tradition; no harmful interaction demonstrated.
Conditions. Planted together Both plants must be present at the same time.
Applies when. The planner does not separate these plants on this claim; it evaluates space, light, water and timing normally.
Limitations. No mechanism identified.
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 kohlrabi--tomato--flavor_or_growth v1. Request a correction.
A realistic garden scene where kohlrabi 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".
BeetBeta vulgarisNo verified relationshipOther Kohlrabi and Beet 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 kohlrabi and beet.
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 kohlrabi--beet--other v1. Request a correction.
No records match those filters
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Example layout for kohlrabi
No supported or conditional relationship specifies a layout. Space kohlrabi at 15–20 cm and plan by light, water and timing.
Side view of kohlrabi (30–45 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
Kohlrabi
Tomato12 wk overlap
Beet16 wk overlap
Overlap in weeks
Tomato
12 weeks
Beet
16 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 kohlrabi on a 3-year cycle with other cabbage family crops (Cabbage, Broccoli, Cauliflower, Kale, Brussels sprouts). Shared risks: clubroot, cabbage root fly, cabbage white caterpillars.
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 kohlrabi: 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
