Q.astilbe color
I have several Astilbe in my garden, all from same plant. I have divided it twice and it used to be quite pink in color but it now has faded to soft white. Is there any thing I can do to bring back the color?
Astilbe flowers are their brightest color when they first appear and fade as they age.
There is nothing that you can do to increase or change the color. It is just the nature of the plant.
You could look for some bright colored varieties to boost your garden appearance.
Here is a link about Astilbe care.
https://www.gardeningknowhow.com/ornamental/flowers/astilbe/growing-astilbe-plants.htm