Question: how tall are garden phlox?
Answer: Garden phlox (Phlox paniculata), also called summer phlox, is a sun-loving perennial with a long flowering season. Large clusters of flowers, called panicles, sit atop stems that grow 3 to 4 feet (91 cm. to 1 m.) tall. This native American wildflower thrives in USDA plant hardiness zones 4 to 8.