Buckwheat and black buckwheat are two different crops, their differences are as follows:

1. Cultivation area: black buckwheat is mainly distributed in Europe and Asia, while black buckwheat is mainly distributed in North America and Europe.

2. Plant morphology: black buckwheat and black buckwheat in plant form slightly different. Black buckwheat consists of 10-30cm tall erect herbaceous plants, while black buckwheat is composed of 1-1.5m tall erect shrubby plants.

3. susceptible to disease: black buckwheat is more affected by diseases such as gray mold, black buckwheat is relatively more resistant.

4. Use: black buckwheat is mainly used in the production of food and medicine; while black buckwheat is mainly used in the production of beer and spices.