Peony buds are as big as hazelnuts. How long before it blooms?

The bud is as big as a hazelnut and blooms in about 15-20 days.

Peony is suitable for popularization and cultivation. By controlling the temperature, it can bloom on New Year's Day and Spring Festival. The method is to pot peony 35 ~ 60 days before the festival, move it into the greenhouse, gradually raise the temperature, open the window for ventilation at 20 ~ 25℃ during the day, and increase the relative humidity at night10℃ ~ 25℃; Apply dilute fertilizer solution every 10 day, or spray 0.2% ~ 0.3% potassium dihydrogen phosphate on the leaves as topdressing. If the flower buds don't germinate, use 300 ppm ~ 500 ppm gibberellin solution to accelerate the germination, so that the flowers can bloom in 60 days at most and 40 ~ 45 days later. If the flowers bloom in advance, the potted flowers can be moved into a low temperature room (5 C ~15 C) for temporary storage.