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Ornamental Grass Care Basics

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Garden of Grasses
Photo Credit: Wayne Handlos
An exuberant garden of grasses is quite a sight.
Ornamental grasses can be a wonderful addition to almost any garden or landscape. Thanks to their structural qualities, ability to add graceful movement to a garden, and their colorful and variegated leaf forms, these plants have so much to offer.

Grasses have the same basic requirements as other garden plants: appropriate light, well-drained soil, an adequate water supply and periodic trimming. They should be planted the same way you would plant any perennial or shrub: Choose a location with adequate light for the needs of the plant, loosen the soil, don’t bury the crown and water well.

The following tips should help keep your ornamental grasses thriving in your garden:

Soil and Fertilizer

Amendments and fertilizers are not usually necessary. If either is added, they may stimulate the grass to grow too fast and the plant will fall over.

Watering

Grasses native to Mediterranean climates (such as ruby grass, autumn moor grass, giant needle grass and all the California native grasses) need extra watering only in their first year to help them get established. Once they are, supplemental watering during dry periods of winter is helpful and would be all that’s needed.

Grasses from other regions (such as Calamagrostis, Miscanthus and Muhlenbergia) benefit from occasional watering – especially during hot, dry periods – for their entire garden life. When watering such grasses, water thoroughly and infrequently – probably not more than once a week.

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Mulch around ornamental grass
Photo Credit: Wayne Handlos
Wood chips make a nice mulch.

Mulch

Your grass plantings should be mulched to help conserve water and prevent weed growth. As organic mulches decompose, they’ll release an adequate supply of nutrients for most grasses.

Warnings
  • Several ornamental grasses can become weedy in the landscape due to a wild seeding nature or an aggressive growth habit. Beware of such thugs as Hakonechloa macra, Nasella tenuissima, Pennisetum setaceum and Phalaris arundinacea.
Tips
  • Most ornamental grasses are fairly fast-growing. It makes good shopping sense to buy plants in 4-inch (quart) pots.
Facts
  • Grasses with dense clumping habits (forming symmetrical mounds) are said to be “caespitose.” These are generally the lowest-maintenance grasses.
  • Most grasses do best in full sunlight, although some grow better in shade. Check reference books or your local garden center for more information on a particular grass.
 
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Articles
  • Grasses for Fall
    Certain ornamental grasses can produce striking effects from fall into winter. Here’s a look at two of them.
  • Say Hello to Ornamental Grasses
    Let us introduce you to a wonderful group of plants that offers texture, movement and sound to the garden year-round.
  • Lindheimer Muhly: A Grass for All Seasons
    If you’re looking for a nice fall plant, consider Lindheimer muhly. While this ornamental grass holds year-round interest in the landscape, its most attractive season arrives when the days shorten and temperatures drop.
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