This compact butterfly bush brings saturated purple flower spikes and steady summer color to your landscape. Plant Buddleia davidii 'Dark Dynasty' where you can enjoy the blooms up close and where pollinators can easily find it. In warm weather you will often see butterflies and other nectar visitors working the flowers throughout the day.
Give it a spot in full sun and well-drained soil. Once established, it is fairly tolerant of short dry spells, but it blooms best with consistent moisture during hot stretches. Water deeply at the base, then let the top of the soil dry slightly before watering again. A 2-3 inch mulch layer helps even out moisture and soil temperature, but keep mulch pulled back from the stems.
Expect a mature size around 24-36 inches tall with a roughly 36-48 inch spread. Use it as a focal point in a mixed border, as a repeating accent along a sunny fence line, or as a backdrop for perennials and ornamental grasses. For a tidy habit and strong flowering, cut back in late winter or very early spring before new growth begins. Remove spent flower spikes during the season if you want to keep the plant looking neat. In colder areas it may die back in winter and regrow from the base in spring.
Because some butterfly bushes can reseed, check local guidance if you garden near natural areas. Pair it with other sun-loving plants and include a variety of bloom times so your garden stays active from spring through fall.