Spiraea thunbergii (Thunberg spiraea) is a member of the Rosaceae family. This deciduous shrub exhibits a bushy growth habit and is characterized by its deciduous foliage. It has a hardiness rating of hardy – very cold winter (-20 to -15ºc) and is hardy throughout the UK and northern Europe. Many plants grown in containers will be damaged unless given protection.
When fully mature, Spiraea thunbergii can reach an ultimate height of 1–1.5 metres and a spread of 1–1.5 metres. For optimal growth, it prefers east–facing or south–facing or north–facing or west–facing aspect and exposed or sheltered positions. It thrives best in chalk or loam or sand or clay soil types and should be placed in full sun or partial shade.
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