Buttonbush 'Magical Moonlight' (Cephalanthus occidentalis) brings bright, creamy-white flower spheres to wet spots where many shrubs struggle. You will see the distinctive pincushion blooms in summer, and the plant typically forms a full, multi-stemmed shrub that fits naturally along ponds, streams, and rain gardens.
Give it consistently moist to wet soil for best performance. It tolerates periodic flooding and standing water, but it is not happy in dry ground. Plant it in full sun for the strongest flowering, though it will also grow well in part shade, especially where afternoons are hot.
At maturity, expect about 60-96 inches of height, with a broad, spreading habit that can reach roughly 48-72 inches wide. The rounded form works well as a specimen at the water's edge, in a native planting, or in a shrub border where you want summer bloom and seasonal texture.
Pollinators flock to the fragrant blooms, and the plant's persistent seed heads can add interest later in the year. Pruning is usually optional; if you need to control size, shape it in early spring before new growth begins. Mulch the root zone to help retain moisture, and water regularly during establishment.