Posted: 10/08/2016 at 18:55
Astilbes love water...not standing in water but being in moist soil Celandonsusan so two things. It will not reallg like being in a pot. It is a big rooted plant and thirsty and hungry. The leaves will dry out "alarmingly"
you said it is a temporary measure....that's fine but bury the pot in the ground. It will help stop the roots drying out too much
don't worry about slugs...in my experience astilbes are not attacked by them.
from September on, when weather cools a bit, your astilbe will be happier.
Meanwhile shade and water. You cannot really overwater a potted astilbe
(astilbes are a favourite of mine growing large, lush and colourful)