Double Reeves Spiraea. This old cultivar is prominent in the South with its mounding wispy stems which are lined with small double white terminal corymbs along its branches. It flowers here in mid zone 8 in early April. The foliage is colored and bluish-green with a yellow to orange fall color. In mild winters it will retain some of its foliage. It is a great filler in shrub borders. It is also very heat and drought tolerant and will thrive in areas with no irrigation. It is best grown in full sun for the best flowering.