You can dig wild vegetables in Zhangjiakou in about January.

Shepherd's purse: The shepherd's purse in the first month has not yet bloomed, so the shepherd's purse at this time is the freshest and tenderest. It is green with a rusty color, but it is relatively troublesome to handle.

Bitter vegetables: In February, when the weather is getting warmer, bitter vegetables are at their freshest and tenderest. Bitter vegetables taste a little bitter when eaten. They are mainly eaten cold, which has the effect of reducing internal heat.

Sophora japonica: The most suitable time for picking sophora japonica in the north is in the middle to late March of the lunar calendar. The picking time is only one week, which is short. If you like it, you can pick it at this time.

Many wild vegetables have medicinal value. If eaten properly and symptomatic, most of them can be regarded as folk remedies. In addition, wild vegetables are mainly cool and cannot be eaten in large quantities at one time. It is best to blanch them in boiling water before eating.