This is the second year for a cover crop so Buckwheat is the crop again , the reason was because the fast growing crop. The residue decomposes quickly when dug into your soil and adds needed organic matter.If you plant about 5 or 6 weeks before the first frost, you won’t have to turn it in. Buckwheat is frost sensitive and will be killed.To prevent reseeding buckwheat must be turned under or cut within 10 days of flowering to prevent reseeding. Buckwheat sets seed quickly. Un