A hybrid from Norway, Spiraea x cinera ’Grefsheim’ is particularly heavy-flowering in early spring before the leaves appear. Blooms are white. Growth habit is upright with arching stems. It will tolerate some shade but is best in full sun. Height to 4 feet or so and about as wide. The foliage is a soft sea-green. Dr. Dirr writes "about as handsome an early-flowering spirea as one could ever hope to find." Zones 4 - 8.
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