Every year before the Chinese New Year or Tomb-Sweeping Day, many farmers will dig this kind of water grass in the fields and dig it back. They don't feed pigs, but eat them as wild vegetables. This kind of grass can be beaten with glutinous rice into blue glutinous rice, and then wrapped in blue glutinous rice in jiaozi or steamed. This kind of steamed dumpling is called rat ear glutinous rice.

This kind of Hedyotis diffusa will appear on the ridge of the countryside every year after the spring. Its leaves are like mouse ears, and there are many filamentous substances like cotton on the surface of the leaves. Therefore, this aquatic plant will appear in many places, and its distribution range is particularly wide, so its name is different in different regions. For example, some places are called Tian Ai, others are called cabbage and spinach grass. It begins to blossom in February. It especially likes to grow in paddy fields, paddy fields and ridges in rural areas, so many farmers regard it as harmful grass and often remove it or bring it back as pig feed to raise pigs.

Saxifraga can not only be eaten as wild vegetables, but also has good medicinal value. Saxifraga whole plant can be used as medicine. It is sweet and non-toxic, has the effects of eliminating phlegm, clearing away heat and toxic materials, and can also be used for reducing blood pressure of asthma, bronchitis and non-infectious ulcer wounds. This rotten grass is used by many farmers to prepare folk prescriptions.

Spring is also a particularly suitable season for growth. Interested friends can go to the rice fields near the rural ridges and find them easily. When picking this grass, you must ask the local farmers to see if the land has been sprayed with pesticides. If it is not sprayed with pesticides, then you can dig this grass.