Companion Finder

Choose two plants and your context. The result shows every reviewed record for the pair, whether they overlap in time, and whether they physically fit.

Dates you confirmed in the calendar are used automatically.

No result says just "good" or "bad". Unknown is shown as unknown.

How to read a result

  • Timing overlap comes first: if the plants are never in the bed together, nothing else applies.
  • Each reviewed record shows its status, direction, named effect, evidence tier and a "Why?" panel with context, limits and sources.
  • Physical fit (light, water, pH, sprawl, family) is checked from plant attributes and can override a positive claim.
  • Not reviewed yet is different from no verified relationship.

Prefer a full write-up? Every plant has a companion profile.

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

Primary source types

  • Peer-reviewed journal articles
  • University extension publications
  • Government & research institute reports
  • Systematic reviews & meta-analyses

Last updated

August 24, 2026

Learn more about our approach