These garden favorites do well in high humidity, one reason that they thrive in the southeast U.S. Humidity in the air helps keep phlox plants from losing moisture and wilting. They don ‘t do well with extreme temperature fluctuations, however, which is why they’re recommended only for growing zones 4-8.

In warmer areas, it is advisable to plant it in partial shade to mitigate heat-related strain. This perennial is not a big fan of humidity or extended periods of heat. They are hardy in zones 4-8.

The purple eyes of these tiny white flowers pop against a blanket of green leaves. The phlox subulata, also known as creeping phlox, doesn’t grow any taller than six inches tall. It’s ideal as a ground cover and will deal with the heat of summer in zone 9 like a champ.