When will there be green plums?

Generally, plums are picked in the middle of April in the lunar calendar, and ripe plums are picked in the end of April or early May, May and June in the lunar calendar. This is also called the rainy season in the south of the Yangtze River, but at that time, there were few plums, most of which were picked and sold. Because few people ate plums without processing, they would pick them whenever a manufacturer came to collect them. Hehe, my home is the hometown of plums, but plums are so worthless. Up to now, there are many plum trees.