Other families

Catalog plants that are the only member of their family; rotation notes are on each plant page.

Shared risks

No family-wide shared risks; see each plant.

Named risks, not an arbitrary score: these are the organisms that carry over in soil, debris or volunteers.

Rotation guidance

Leave 1 year before returning any other member to the same bed. Rotation concerns previous seasons in a bed; it is separate from which plants grow together now.

  • Single catalog members of their families; rotation concerns are noted on each plant page.

Catalog members

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