Catching Fire Heucherella brightens shaded areas with vibrant lime green leaves highlighted with red, flame-shaped center markings. This vigorous perennial is more heat and humidity tolerant than some heucherellas. Growing 8-10 in. tall with a 16-20 in. spread, it forms a very dense mound of interesting foliage that is evergreen in most climates.  In early summer, cream-colored flowers appear. For the best foliage color, plant this heucherella where it receives filtered sun or afternoon shade. Grows best in shaded to partial shade. Zones 4-9.