How to Prepare Aster Flowers for Winter


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.

Things You'll Need

  • Mulch


  • Universtiy of Illinios: Asters Are Beautiful in Fall Gardens
  • All Wood Work: Asters and Mums---Jewels of the Fall Garden
  • Washington State University: More Tips for Winterizing the Garden
Keywords: aster winter preparation, winterize asters, protect asters

About this Author

Hollan Johnson is a freelance writer for many online publications including Garden Guides and eHow. She is also a contributing editor for Brighthub. She has been writing freelance since 2008 and her interests are travel, gardening, sewing, and Mac computers. Prior to freelance writing, Johnson taught English in Japan. Johnson has a Bachelor of Arts in linguistics from the University of Las Vegas, Nevada.