12 to 22 inches. Buckwheat is a quick-germinating, warm season annual broad-leafed plant used primarily as cover crop or green manure, but also as grain or bee crop. Flowering begins about 30 days after seeding. Plant after danger of frost has past. Till in shortly after flowering starts (before seed is mature). Two, or even three crop can be produced in a good year. Even with adequate soil moisture, the shallow-rooted buckwheat shows mid-day wilting if weather is warm, but will recover at night. Good Bee crop. Can also be used as a sprout simmiler alfalfa sprouts but heaver, or as a microgreen. Has a high concentration of B-vitamins. Takes about 10 days to mature and is ready when 90% of hulls have fallen off.