Why do peach blossoms have no leaves when they grow?

Peach blossoms bloom first and then grow leaves. This is because their flower bud differentiation is carried out in the summer of the first year. After the primordium of each part of the flower is formed, the flower bud goes into dormancy and can bloom in the next spring. Because the temperature required for the growth of flower buds of these flowers and trees is lower than that required for the growth of leaf buds, the temperature in early spring has met their growth needs, so the flower buds gradually expand and open. However, the temperature at this time can not meet the growth needs of leaf buds, so it is still lurking. When the temperature gradually increased to meet their growth needs, the leaf buds began to germinate, so the phenomenon of flowering first and then growing leaves appeared.