There are several sources for buckwheat seed listed on the
internet via Google search   . . . enter "Buckwheat seed"

here is a quote from one company that may help:

"Buckwheat
Grows on poor soils, boosts phosphates

This failproof, fast-growing cover crop is an excellent soil
conditioner. It often blooms in 30 days from seed. Lush broadleaf
plants will crowd out pesky weeds such as quack grass. Grows on
poorest soil; extracts phosphates and passed them along to later
crops when tilled under. Not winter-hardy. Sow in late spring or
summer at 3 lbs. per 1,000 sq. ft."

I have grown it as a cover crop. In central Ohio, planted
mid-summer, bloomed up until frost. It is a progressive bloomer,
and will have seed lower down on the stalk and flowers higher up.
And, jes, bees worked it only in the morning.

Leland Hubbell

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