This native of the coastal plain of the Northeast (Nova Scotia to Virginia) is resisitant to black knot in my experience! Blooming in mid May through June with a brilliant show of pinkish-white flowers, it is a small stature tree (4′-6′) or multi-stemmed shrub. Plant and enjoy in full sun. It is not fussy about soil, as it tolerates a loose, sandy soil in its native habitat. Often Beach Plum is recommended for roadside plantings since it is salt tolerant. Yes, its fruits are the ones used to make Beach Plum Jam in late summer!