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This document printed from the University of Illinois Extension Gardening Feature at http://www.extension.uiuc.edu/jackson/
Ornamental Grasses
March 5, 2007

Ed Billingsley
County Extension Director, Jackson County and Interim County Extension Director, Williamson County
Jackson County Unit
402 Ava Rd
Murphysboro, IL 62966
Phone: 618-687-1727
FAX: 618-687-1612
edb@uiuc.edu

I love ornamental grasses because they are easy to maintain and very attractive both in summer and winter. One should make sure they are planted in a proper place for sunlight and location depending on the final size of the plant. Read the tag or ask at your local garden center to determine the height of the mature plant. Ornamental grasses range from 6 inches to over 14 feet in height. While driving around you may notice those 8 foot tall grasses by the front door. Possibly, the landscape designer did not read about the mature size of the variety planted.

Once in the ground these grasses require little attention. Grasses have very few insect or disease problems which make them perfect for any low maintenance garden. Mulching will help keep them in check and they need no water except during establishment or drought conditions. Fertilizer is usually not required, but a quarter cup per plant of 12-12-12 will boost growth if needed.

Grasses should be cut back annually before new growth begins. I suggest leaving them standing through the winter because of their attractiveness through this season. In the spring cut the plants back to 4-6 inches. Remove the cuttings from the plant area because they can delay new growth when left over the plant. Plants that have dead or less vigorous centers need to be divided. This requires a strong back and hard work. The root systems of these plants are intense but the reward is a more attractive plant.

Ornamental grasses should be spaced according to their height when planting. For example, if a plant's height at maturity is 4 feet then space them 4 feet apart. If you are trying to grow a hedge, the plants will need to be closer. To close up the screen, plant them at 30 inches apart.

Here are some popular groups for your consideration.

· Miscanthus: These warm season grasses are clump forming and they have very showy flowers. There is considerable variation in height so read the plant tag or ask.

· Fescue: These are cool season, clump forming grasses and need protection from hot summer suns for best results.

· Fountain grass: These are foxtail-like in appearance and can be either annual or perennial. They are mostly warm season and clump forming.

· Switch grass: This warm season native grass with new cultivars of more color is becoming increasingly popular. This too is a clump forming grass.

I hope as you look for additions to your landscape you consider some ornamental grasses. You might even want to tour the Master Gardener Ornamental Grass and Perennial Garden behind the Extension office to get a first-hand look at the mature size of many varieties. Remember, do your homework and you will not be disappointed with the results after you plant.

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