Buckwheat plants were studied to see how they absorb and store selenium, a nutrient important for human health. Both common and tartary buckwheat accumulated selenium in their seeds, leaves, and stems when given different forms of selenium. The selenium in the seeds was found in organic forms similar to selenomethionine and methyl-selenocysteine. Tartary buckwheat was more resistant to high selenium levels than common buckwheat. The type of selenium supplied affected how much was taken up by the plants. Sulfate and phosphate in the soil also influenced selenium uptake. These findings are important for improving selenium levels in crops for better nutrition.