How many fast-growing crape myrtle can be planted in an acre of land?

The fast-growing Lagerstroemia speciosa is a small tree. The fast-growing Lagerstroemia speciosa introduced from Jiangxi Sannong Company grows faster than all Lagerstroemia speciosa in the nursery. It is suggested that if planted directly, 300 plants can be planted per mu, and the row spacing is1.5m *1.5m. After two years of planting, it can be directly used in the project when it grows to 5-6cm.