Apple fruit, also called Eichhornia crassipes, is mainly distributed in Guangdong, Guangxi and Fujian. Because it will burst open when it is mature, two deep red round fruits can be seen through the gap in the shell. If you look at it together, it looks like a person's water hyacinth, so it is also called water hyacinth. July and August are the mature seasons of Eichhornia crassipes every year. Because it is flat and sweet, it has the functions of warming the stomach, killing insects, strengthening the spleen and stopping diarrhea, and can be used for cooking soup.

In the past, Eichhornia crassipes was actually a very common tree. In the past, there were several trees behind many old houses, and farmers carried them out for sale in the season. Steamed Eichhornia crassipes is golden and delicious, just like yolk, so some people call it egg fruit. Fruits can be eaten, leaves can also be wrapped in zongzi, rolled up, and skins can be boiled and drunk, which has the effect of expelling insects. It can be said that the whole body is treasure. Moreover, it is also a very rough fruit tree, but in rural areas, because of its short maturity and poor economic benefits, few people plant it. In fact, Eichhornia crassipes is a very thin thing, which smells like chestnuts and is delicious to stew with meat. And because Eichhornia crassipes is not easy to taste, it can keep the ribs fresh and sweet.