I have 12 astilbe plants and last summer they all looked terrible! I watered and fertilized appropriately. Was it too hot? The plants face the north-west and are protected by shade with a spot or two of sun coming through all afternoon.

I have a dozen astilbe plants that all look like they're been burned from
the inside of the plant out. Is this a fungus or a bug? These plants are four-years-old and until this summer have looked great.

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