Does the fast-growing Lagerstroemia indica grow fast? How long is the flowering period?

The fast-growing Lagerstroemia speciosa grows faster. The diameter of cuttings with a height of 100cm and a thickness of 1.2cm can reach (30cm) 3-3.5cm in the first year and 5-6cm in the second year. The growth of Lagerstroemia speciosa is several times that of common Lagerstroemia speciosa, and the flowering period varies with varieties and strains. Generally, it varies from 2 to 4 months.