What does it mean that sesame flowers blossom into plums in summer?

At the end of the rainy season, the weather began to get hot, which is the flowering period of sesame flowers. Plum blossom means that the rainy season is coming to an end, and the date is fixed between July 8 and 19. Entering summer means entering the dog days, which usually happens around July 22nd every year. Sesame flower Sesame has long purple-red flowers, with spikes of 20 cm to 30 cm long, and the flowering period is from July to September. "Get up early and get greedy for the dark" is a meteorological proverb in China, reminding people to avoid summer.