Cultivars that are disease resistant, especially to red stele, make good choices. Buy from a reputable nursery that carries named cultivars that are certified disease-free. Order plants early and request delivery between April 15 and May 15 for planting time. Order on Monday, if plants are shipped, to avoid having plants held in warm buildings over the weekend. Locations that are in low-lying frost pockets will probably result in damaged blossoms.
Plants begin to grow and blossom very early in the spring.
However, very sunny sites that warm up early in spring encourage premature, frost-susceptible growth. A sunny, north-facing slope is ideal. Good drainage is important for healthy roots. Plants grow most vigorously in spring and fall, when rain and cool temperatures are more likely. Avoid chronic drainage problems by planting in raised beds or installing drainage pipes and incorporating large amounts of organic matter.