Florist's spiraea
Astilbe japonica
Overview
The Florist's spiraea, or Astilbe japonica, is an eye-catching ornamental plant with dense, feathery-looking flowers and foliage that is sure to add a bit of life to any garden. This species is easy to grow, hardy, and tolerant of both full sun and shade. It blooms prolifically in mid to late summer with various shades of whites, pinks, and purples. The fluffy-looking blooms makes a wonderful addition to any floral arrangement and can be used both indoors and outdoors. With minimal care, this fast growing shrub can become a lasting part of any beautiful garden.
Care Guide
Watering
Florist's spiraea (Astilbe japonica) should be watered regularly, preferably once or twice a week, giving the soil a thorough soaking. Over-watering should be avoided as the soil should be allowed to dry out between waterings. For optimal growth, give the plant 1 to 2 inches (2.5-5 cm) of water each time you water it. During periods of drought, increase the watering to make sure the soil remains consistently moist.
Light
Florist's spiraea requires full sun for 4-5 hours a day, or partial sunlight for 6-8 hours a day. It tolerates more light in cooler climates, but in hot climates, it should be protected from direct sun during the middle of the day. This is especially true for blooming varieties that can be affected by too much sun. Too little sun can leave the plant looking "leggy" as it strives to reach more sunlight. Ideal morning sun with afternoon shade is best, but reduce the amount of direct sunlight in hot weather to protect the delicate flowers.
Temperature
Hardiness zone 4-9.
Pruning
Florist's spiraea should be pruned in early spring, before new growth appears. Cut back any dead or overly long branches, then shape the plant by cutting 1-third of the old stems down to ground level. For denser, fuller growth, cut the remaining branches back slightly and remove any crossed branches or dead wood. Pruning should be done just once a year in the spring.
Propagation
Division, Cutting, Layering Propagation, Seed Propagation
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