Crimson Red Astilbe lost flower color
Thanks for writing. Astilbe flowers typically stay in color for a week or two; after that, they fade and it's just a part of the plant's natural bloom cycle. Short of spray painting the spent flowers, there's nothing you can do to get them to stay red longer or get them to turn red again until they send out new blooms next June.
---Justin, Senior Garden Editor, BHG.com
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