I've never dealt with roots before. I picked two roots up at the store today and I have no idea how to plant them or at what time of year. I'm planning on planting them in my window well, but will they die from the lack of sun? I also bought five Lily of the Valley roots to plant in my window well with it. Do they "play nice" with each other?
We have an article to help you with planting and care of Astilbe bare roots.
https://www.gardeningknowhow.com/ornamental/flowers/astilbe/bare-root-planting-astilbe.htm
I was wondering at what time of year I should plant them.
I should also add that you can start them earlier by placing in pots with a good commercial potting mix.
They can be placed in a cool greenhouse or a cold frame. You will need to keep them in bright light but above freezing temperatures.
You can then plant them out when weather warms.
Plant out any time after danger of frost has passed in the spring.
https://www.gardeningknowhow.com/ornamental/flowers/astilbe/bare-root-planting-astilbe.htm
I would like to know how specifically to grow these roots indoors. I don't want to wait until the weather gets warmer. I'm afraid that if I do, they'll rot.
Pot the bare roots into 1 gallon nursery pots using a good quality potting soil.
Water the containers and place them in a cool and bright location.
Move outdoors when danger of frost has passed.
Do I need to soak the root ball before planting?
I assume you are planting bare roots. They should be shipped moist and remain so up until planting. You can add some water, but soaking should not be needed.
This article will help you.
https://www.gardeningknowhow.com/ornamental/flowers/astilbe/bare-root-planting-astilbe.htm
Can astilbe take morning sun and is it ok to put chicken litter around it?
A few hours of morning light will be good for Astilbe growth.
https://www.gardeningknowhow.com/ornamental/flowers/astilbe/growing-astilbe-plants.htm
Make sure the chicken manure is properly composted before applying as a top dressing or fertilizer.
Chicken manure is high in nitrogen and too much nitrogen will cause lots of green leaves and few flowers.
https://www.gardeningknowhow.com/composting/manures/chicken-manure-fertilizer.htm
Could astilbe cause any kind of allergic reaction to a dog?
Astilbe plants are not poisonous to dogs, and don't traditionally cause negative effects, but you should check with your veterinarian since all dogs (just like humans) are different. Your dog may be experiencing a reaction to a plant (whether it's an Astilbe or any other plant) that other dogs may not.
all of my astilbes(20) have changed from pink to white,is there a cure
Though I found no reason for Astilbe changing color in my research, this article may help in some explanation.
https://www.gardeningknowhow.com/ornamental/flowers/astilbe/growing-astilbe-plants.htm