According to Apple Green Health Network, the black seeds in pitaya are the seeds of pitaya. Pitaya seeds are sesame-sized, oval in shape and small in hilum, and most of them grow in pulp. The collected seeds can be used for sowing and reproduction. During cultivation, you can dig out the pulp, then wrap the pulp with gauze, rub the pulp repeatedly by hand to separate the pulp from the seeds, then rinse it with clear water and filter out the pulp to get the seeds of pitaya.

Pitaya, the fruit of a climbing succulent shrub belonging to the genus Tianchi in cactus family, has wavy or crenate branches and is dark green to light blue-green. Hairless and bony; Spiny cones; Berries are long red spheres with small umbilicus and white flesh. The seeds are black and obovate, and the flowering period is summer and autumn. Because of its red fur, the protrusions on the fur are like flames, which also reminds people of Longlin, hence the name pitaya.