Willow
Willow is a tropical tree that grows best in the 21–26°C range with 1000–1300 mm of rain, cropping over a 300–330-day season.
How it grows
Willow grows on a tree — the fruit ripens above the ground, up in the canopy.
Where Earth's climate suits willow
Climatic suitability only — scored for every 0.5° of the planet from this crop's temperature and rainfall tolerances (FAO EcoCrop) on AgroClim 1991–2025 normals (AgERA5 temperature, CHIRPS/ERA5 rainfall). It shows where the rain-fed climate permits the crop, not where it is grown today; irrigation lets many crops thrive in drier country than the map suggests (California, Egypt, the Indus and Nile).
Proxy envelope: EcoCrop lists Salix alba but provides no usable climate thresholds for it, so this page models the same-genus Salix babylonica var. sacramenta envelope. Treat the map as a screening estimate, not species-level validation.
Who grows it — and where the climate merely allows it
Climate envelope · FAO EcoCrop proxy
Deep bar = optimal range; pale bar = absolute tolerance. Beyond the pale bar the crop fails. Latitude tolerance ±45° · soil pH 6–8.
Growing calendar & hazards
An annual cycle of roughly 300–330 days from sowing to harvest, so it is timed to fall within the frost-free, adequately-wet part of the year for the location.
- Cold & frost. A frost-sensitive crop: temperatures near or below freezing damage or kill it, so it is confined to frost-free seasons and warm climates.
- Heat. A cool-season crop that bolts or fails in summer heat; best grown in the shoulder seasons or at altitude.