Ludwigia prostrata
A small, annual primrose-willow of wet ground across tropical and subtropical Asia, especially common in China's rice fields, ditches and pond margins. It is easy to grow as a summer annual: full sun, wet soil and heat.
Where it grows wild
Paddy fields, ditches, marshy ground and pond and stream margins in lowland to low-mountain country, usually in full sun.
Recorded at 675 to 1,640 m (median 900 m) where elevations are given, but many Chinese records are from near sea level.
🔒 Growing it like that
The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 3.0 licence, unmodified.