This cherry has white, fragrant flowers and is hardy to zone 6. Sargent cherry - Of interest due to its masses of small flowers in spring and its scarlet autumn display. It can grow up to 50 feet in nature. Hardy in zones 5-9. Hardy in zones 3-8.
Many cultivars are available.
Unfortunately, it tends to be large and coarse otherwise. This cherry's pink double-flowers appear before the leaves in spring. Hardy in zones 6-8. Its small leaves color well in autumn, and it bears sporodic white or pink flowers on bare wood during frost-free periods in winter. It has the added advantage of more delicate twigging than most cherries.