My favourite seed to sprout in winter is wild buckwheat (Fagopyrum tataricum), supposedly the wild ancestor of Fagopyrum esculentum the common buckwheat grown for the gluten free grain. I sow it repeatedly in large pots in earth on the window sill in the leaving room. The plants self-sow on my vegetable beds and each plant produces a lot of seed, so i just leave a few to grow and collect all the seed I need. Harvested some sprouts for lunch today:
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