July. According to the Fruit Encyclopedia, seed melons are sown in April every year, and the growth period is about 3 months. In July, a large number of seeds mature and go on the market. Because of the high yield of red melon seeds of this kind of seed melon, melon farmers will mash the seed melon directly after it matures, and then wash the seeds out with clear water, so it is called "washing seed melon".