Removing the spent flower heads (deadheading) will not extend or promote additional blooms in astilbe. Therefore, it is usually a matter of asthetics. Deadhead these newly planted astilbe so that they put energy into root growth rather than into seed formation. Astilbe do not self-seed readily, so seedlings should not be a big problem if you decide to leave the seed heads in future years.
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Should astilbes be deadheaded during the growing season? I just planted two new astilbe plants, and the blooms are almost brown (they were lavender).
Last Updated: November 25, 2011
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