Nepenthes is a tropical insect-eating plant, which is native to South America, Africa and Southeast Asia. It adapts to the hot and humid climate, and there are about 100 wild species. In China, there are only a few wild species in Sanling Mountain and Leizhou Peninsula, which have no practical significance in insect catching. Some areas have launched flower exhibitions.

Nepenthes are perennial vines, most of which are about 2-3 meters high and grow by climbing on trees or walls. The leaves are long and round, and there is a cage at the cage end, forming a bottle-shaped or funnel-shaped insect trap, and there are viscous liquid secretions or fragrant secretions at the eaves.

Once the insects fall into the cornice, they will slide into the insect trap. Some Nepenthes still have mulch on the eaves. When the worm falls into the cornice, it automatically closes and is submerged by the liquid in the bottle, and the nutrients of the worm are decomposed and gradually digested and absorbed.