Why doesn't crape myrtle sprout around?

Lagerstroemia indica 1 has five propagation methods. Sowing and breeding; 2. Cutting propagation can be hard branch cutting and soft branch cutting; 3. Meristem propagation: dig out the roots of tillering seedlings that germinate in the rhizosphere of plants in early March-April or autumn, properly prune the roots and branches, and plant them separately; 4. Layered propagation; 5. Grafting method. Among them, sowing is not the best way. The seeds of Lagerstroemia indica ripen in11-65438+February. The weather in the north is cold, and the leaves have fallen in 65438+ 10. Even if it doesn't drop, it grows slowly, the seeds can't mature, and it is not easy to emerge after sowing. So we only see the fruit on the tree and don't see it fall, so there will be no seedlings around naturally. But after years of growth, tillering seedlings will appear around.