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Last updated August 24, 2026

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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