Best grown in average, medium moisture, well-drained soils in full sun. Does well in loamy, clay soils with good drainage. Benefits from a slow release fertilizer. Overly fertile soils tend to produce lush foliage growth at the expense of flowering with somewhat increased susceptibility to winter injury. Water roots deeply, particularly in dry spells, but avoid wetting the foliage. Plant in a protected location and apply a winter mulch. Growing crape myrtles in the zones 5 and lower area can be tricky because the above ground branches often die to the ground in winter, particularly when temperatures dip below -5 degrees F. Above ground branches are considered to be winter hardy to USDA Zone 7, whereas roots are usually but not always hardy to USDA Zone 5. In the zones 5 and lower area (Zone 5b to 6a), some gardeners prefer to grow these plants in somewhat the same manner as buddleias (butterfly bushes) by cutting all stems back to 8†in early spring each year. Roots will sprout new stems which typically grow 2-4’ tall (sometimes more) by the end of the growing season. Flowers appear on the new wood. It is also an option in zones 5 and lower to grow these plants as woody shrubs by pruning them back to live wood in spring at the time new foliage begins to appear (in somewhat the same manner as with some shrub roses). With protection, top growth will survive some winters, but may still suffer significant injury or die to the ground in harsh winters. Lagerstroemia is a genus of about 40 species of deciduous and evergreen shrubs and trees from warm-temperate to tropical areas of Asia to Australia. They are grown for their very showy, lovely summer to fall bloom. In warmer areas many can be grown as trees but in colder climates they may be killed to the ground but resprout from below ground to be grown more as shrubs.
