I have had a row of astilbe growing on the east side of my house for a decade, between my sidewalk and the foundation. It is in a sandy soil. I thought I lost them last summer during an extremely hot summer drought in SW Ontario, Canada, they died right back, I only had one with any leaves on it. Surprisingly, they came back this spring as if nothing happened. I don't think these flowers are difficult to grow at all if they are in the right place.
I have had a row of astilbe growing on the east side of my house for a decade, between my sidewalk and the foundation. It is in a sandy soil. I thought I lost them last summer during an extremely hot summer drought in SW Ontario, Canada, they died right back, I only had one with any leaves on it. Surprisingly, they came back this spring as if nothing happened. I don't think these flowers are difficult to grow at all if they are in the right place.