Lagerstroemia indica Red 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 protected locations and apply a winter mulch. Growing crape myrtles in the St. Louis 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 St. Louis area (Zone 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 St. Louis 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.