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These are classified as “moderately difficult” plants in some circles. Astilbes like water, and it appears you have been giving it enough. But too much? Is it draining? Draining is critical, and a too-small container, or poor soil, may be leaving the roots in a puddle.

Astilbes like direct (but not blazing) sun with all that water but prefer shade and a bit less water in that environment. Is your plant indoors or outdoors? Does any of this sound familiar?

Here’s another thing: they prefer a slightly alkaline (high) pH soil. Do you have any idea of your soil pH? Amd is it rich with organic matter? Potting soil is probably too “thin” by itself. Peat, compost, and organic matter are essential.

Are you beginning to see how it earned its ranking? Another thing: is your container large? or is it a tight-ish fit? If you start again, consider a large-ish container in some sunlight with lots of good soil. 

We really hope this helps. Astilbes are beautiful but a tad finicky.

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