Is this crape myrtle? Will it grow so small?

It's crape myrtle. It will grow up. Whether you plant seeds or cut them, they will bloom that year. Plants that are too weak will bloom in the next year. I planted it all. With the growth of age, it will keep growing. In order to prevent it from growing too high, you can cut it short after the leaves fall in winter. For many years, my Wei Zi has been pruned every winter.