How to Prepare Aster Flowers for Winter

Overview

Asters, also known as Michaelmas daisies, are fall-blooming perennials that come in a large variety of colors and sizes, according to the University of Illinois. Asters can range in size from 6 inches to 6 feet tall, although in most cases the taller varieties need to be staked. Asters grow best in full sun with well-drained soil that is kept moist. Even though asters bloom in the fall, they still need winter protection.

Step 1

Remove the aster blooms as they fade. Pinch them off at the base of the stem with your thumb and fingers.

Step 2

Divide your asters, if needed, in the fall after they finish blooming. Dig up the established plants and separate them into two different plants. Plant each new aster in a hole as deep as the root ball and twice as wide. Fill the holes with soil.

Step 3

Water the ground around the asters well before it freezes. Make sure the ground is moist but not soaked.

Step 4

Cut the asters down to the ground after the ground freezes.

Step 5

Cover the asters with 2 to 3 inches of mulch to protect the roots during the winter.