Asters are a tough perennial. They are cold hardy in zones 3-9 and are able to withstand a wide range of temperatures. They prefer average garden soil that is well-drained and not soggy as they do not like wet roots. A quick draining, sandy or loose soil is preferable for planting. They do well in full sun but will tolerate light shade, although they will produce fewer blooms. They are not fond of commercial fertilizers and would prefer a light coating of peat moss mixed with cow manure or an application of compost in the late spring or fall.
Protecting Asters in Winter
Asters require little winter protection. Some gardeners prefer to give perennials like asters a light covering of salt marsh hay or compost to help protect the plant crowns in winter, but it is not necessary.
Cutting Back Asters For Winter
Asters should be cut back in late fall after they have finished flowering to just a few inches above the soil line.
Asters Winter Care in Pots
Asters grown in pots or containers during the summer months may be cut back and moved inside to a cool but above-freezing area for the winter. They may also be removed from these containers and planted in the garden for the winter and repotted in the spring.
Watering Asters in Winter
Asters growing in the garden require no additional watering in winter. Asters growing in containers that have been brought inside should be checked frequently to see if they are dry and should be kept slightly damp.
Growing Asters Indoors
Asters will not do well growing indoors as they require a chilling period for dormancy.
Steps To Care For Asters in Winter
Step 1 - Cut asters back to a few inches above soil line
Step 2 - Asters may be lightly mulched with salt marsh hay or compost
Step 3 - Make sure the soil is well drained
Step 4 - Make sure the area is not wet
Step 5 - Add compost to base of plant