How we evaluate.
CompareGreenhouse compares greenhouses and garden equipment on documented facts. Every specification you see traces back to a captured listing or a manufacturer document — and when something isn't published, we say so instead of guessing.
What the evidence labels mean
- Listing sourced — the value was captured from a product listing (including the Amazon Creators API) on the date shown. It reflects what the seller stated, not independent testing.
- Document verified — the value comes from a manufacturer document such as a manual or specification sheet.
- Hands-on tested — we ran a documented trial. We will only use this label once a real trial with published methods has taken place.
- Not published — the manufacturer does not state this specification. It stays unknown; it never becomes a guess, a zero, or a hidden "verified" badge.
How products get into the catalog
Products enter only with a captured source record for the United States marketplace. Anything irrelevant to growing — for example a decorative craft kit — is excluded from growing-structure recommendations rather than padded into the catalog. When availability or data freshness can't be verified, the product is held back rather than shown with invented values.
Editorial independence
Recommendations, ordering and filtering are based on documented fit for your space, climate and budget. Commission rates play no role in what we recommend or how products are ordered. Where we don't yet have enough evidence to recommend anything, we say that instead of filling the gap.
Affiliate disclosure
We may earn a commission when you buy through links on this site. As an Amazon Associate we earn from qualifying purchases. Commercial links are marked as sponsored, always name the merchant, and never change the editorial content around them.
Corrections and contact
Found something wrong or outdated? Corrections are welcome and taken seriously — write to [email protected]. Substantiated corrections are applied and noted; specifications that lose their source are marked unknown rather than silently kept.