Spiraea thunbergii (珍珠绣线菊), Thunberg spiraea[1] or Thunberg's meadowsweet,[2] is a species of flowering plant in the rose family, native to East China and Japan, and widely cultivated elsewhere.

[3] Growing to 1.5 m (4.9 ft) tall and broad, Spiraea thunbergii is a small, long-lived shrub with thin, flexible stems.

[4] The plant-growth inhibition characteristics can be used against diverse species as lettuce (Lactuca sativa), pigweed (Amaranthus retroflexus), red clover (Trifolium pratense), timothy (Phleum pratense), and bok choy (Brassica rapa var chinensis).

[5] Spiraea thunbergii is grown as an ornamental plant in temperate regions.

In the UK it has gained the Royal Horticultural Society's Award of Garden Merit.