Full sun or partial shade. Grow in mosture-retentive soil. In dry conditions, Bee Balm is susceptible to powdery mildew. Mulch plants in spring and irrigate during summer dry spells. Plant bareroot plants with the old stems pointing up. Fan out the runners horizontally and cover them with just 1/4in of soil. Plants spread rapidly. Divide every year or two in spring to keep them in check.