Answer: Astilbe, commonly called False Spirea, are great in the part shade to full shade. Their fern like foliage and plume flowers make them a wonderful summer perennial. Astilbe need moist rich humus soil away from the afternoon sun. Dividing them every 3 to 5 years will invigorate them. Maintenance is as simple as cutting them back in the late fall. Astilbe are hardy to Zone 4. The plants thrive in full shade but will tolerate morning sun. Try moving yours out of the afternoon sunshine and they'll probably perk right up.
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