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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Spiraea nipponica' from the website Trees and Shrubs Online (treesandshrubsonline.
A deciduous shrub of rounded, bushy habit, growing 4 to 8 ft high, the branches, leaves, and flower-stalks quite glabrous; young wood reddish. Leaves very broadly obovate or oval, sometimes nearly round, 1⁄2 to 1 in. long, sometimes entire, but usually with a few broad teeth at the rounded apex; stalk 1⁄6 to 1⁄8 in. long. Flowers borne in June, pure white, 1⁄3 in. across, crowded densely in rounded or conical clusters, 1 to 11⁄2 in. wide. Each cluster is borne at the end of a leafy twig, 11⁄2 to 3 in. long, springing from the wood of the previous year; petals overlapping. The synonym refers to the bracts on the flower-stalks, which are leafy and conspicuous on the outside of the inflorescence, but present throughout. Bot. Mag., t. 7429.
Native of Japan (for introduction see ‘Rotundifolia’). It is sometimes injured by late frosts, but when these are escaped, few June-flowering shrubs are more lovely. The individual flowers are beautifully formed, and the clusters are all borne on the upper side of the horizontal or arching branches. It is perfectly hardy, but needs liberal conditions at the root, even more than the majority of spiraeas do. The great thing is to get a comparatively few long shoots rather than a crowd of small twiggy ones. Old shoots should be removed as soon as they produce nothing but twiggy shoots; vigorous plants produce so much new wood that all flowered stems can be cut out.
Synonyms
S. tosaensis Yatabe