My plants look healthy but they are not growing much. Why are they growing so slowly?

The establishment period for native perennial plants can take up to one year. During this time the new plant is focused on root development. Though you may see slow or minimal growth above ground during this time, the root system is developing and growing below ground. As long as your plants do not show signs of poor health, slow growth is likely normal.  You can read more about the normal growth pattern for native perennials here.