Ornamental Rowan A cultivar of the native Irish rowan or mountain ash, Sorbus aucuparia Cardinal Royal is a medium-sized tree of particularly upright and symmetrical form, often used in landscape plantings. Probably the fastest growing rowan, good planted in a line for a fast-growing screen. Creamy-white flowers appear in April–May, followed by large clusters of brilliant red berries in late summer; these hold well on the tree. The leaves are deep green with silvery undersides, very attractive with the wind running through them. An undemanding, very hardy tree, good for pollinators and birds. Plant in full sun for the best shape. Site: Tolerates exposureSoil: Any reasonably well drained soil, acid to neutral soils preferredPosition: Full sunSeason of Interest: Spring, late summer, autumnHardiness: Fully hardyHeight: 40’ (12m) Spread: 13-26’ (4-8m)