Lagerstroemia indica or osmanthus fragrans grows faster.

1, Lagerstroemia speciosa is a deciduous tree or shrub with upright trunk, spreading crown, lush foliage, fast growth and strong adaptability. The growth of Lagerstroemia speciosa is related to environmental factors such as soil, water and sunshine. It likes plenty of sunshine and wet soil. In a good growth environment, the annual growth rate can reach more than 30 cm.

2. Osmanthus fragrans is an evergreen tree or shrub with straight trunk, spreading crown, small and dense leaves, fragrant flowers and relatively slow growth. The growth of osmanthus fragrans is related to environmental factors such as soil, water and light. It prefers abundant sunshine and fertile soil, and its annual growth is generally around 10cm in a good growing environment.