Astragalus complanatus seed | Sha Yuan Zi, Flatstem Milkvetch
LATIN NAME: Astragalus complanatus COMMON NAME: Sha Yuan Zi, Flatstem Milkvetch
Botanical Profile
Sha yuan zi is native to China, growing as a low, sprawling annual to short-lived perennial legume with finely divided compound leaves and small pea-type flowers, followed by distinctive flattened seed pods that give the species both its common Chinese name and its scientific epithet, complanatus, meaning flattened. It favours sandy, well-drained ground typical of much of its native distribution.
Science & Conservation
The seed of this species, harvested and dried as sha yuan zi, has a long history of use in traditional Chinese medicine, classically associated with formulas supporting kidney and liver function, and modern phytochemical research has identified flavonoid compounds in the seed that continue to be studied for their pharmacological properties. This combination of established classical use and ongoing research makes it a regularly referenced seed within traditional Chinese herbal pharmacy literature.
Landscape & Practical Uses
Sha yuan zi seed remains a component of traditional Chinese herbal formulas today, and as with any medicinal herb, appropriate use is best discussed with a qualified herbalist or healthcare provider. Its low, sprawling growth habit and flattened seed pods also give it some interest for gardeners collecting unusual traditional Chinese medicinal plants.
Growing From Seed
Nick or lightly sand the hard seed coat and soak it in warm water overnight before sowing into a loose, well-drained, sandy mix, reflecting this species’ preference for well-drained sandy soils in the wild. Full sun suits it well, and this low, spreading legume typically establishes without much difficulty once conditions are reasonably favourable.
Our Take
We would recommend this one specifically to gardeners building out a traditional Chinese medicine collection rather than general flower or vegetable gardeners, since its low, sprawling habit offers little in the way of conventional ornamental appeal.
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Explore other seeds in this collection: Astragalus echinus (Spiny Milkvetch), Astragalus onobrychis (Sainfoin Milkvetch), Atherosperma moschatum (Southern Sassafras, Black Sassafras), Atractylodes lancea (Mao Cang Zhu).