Watering: Once established, moisture needs vary by grass species, soil type, temperature and other factors. Most ornamental grasses will grow best with at least 1 inch of water per week from rain or irrigation. Drip irrigation is an excellent way to water grasses. It saves water by applying water directly to the roots where it is needed, and reduces the chance of foliar diseases.

Fertilization: Most ornamental grasses need very little fertilizer. It is best to base any fertilizer applications on the results of a soil test. Excessive nitrogen in the soil can lead to disease susceptibility, rank growth, and weak stems.

Cutting Back: Cut back grasses before the new seasons growth starts. Since many grasses are attractive in the garden during winter, cutting back can be done in late winter or early spring. Cut stems to a few inches above ground level for best appearance. Grasses can be cut by hand with pruners or hedge shears, with electric hedge shears, or a weed eater with a brush-cutting blade.

Some evergreen grasses do not recover quickly from cutting back. Comb the foliage of these grasses with gloved hands in spring to remove old leaves.

Dividing: Most grasses should be divided every 3 to 4 years. If ornamental grasses are not divided, they eventually become thin or die out in the center. It is best to divide grasses while they are a manageable size. Overgrown grasses can be incredibly difficult to dig and divide.

Dig and divide warm season grasses during early spring, just before new growth starts. Divide cool season grasses in early fall.

Most grasses have very tough, vigorous root systems and may have to be divided with a shovel, saw or ax. Hose off soil to make the roots easier to work with. Separate and replant the vigorous growth on the outer edges of the clump. Replant promptly, never letting the roots dry out.

Staking: Some tall grasses look best when staked to prevent them from bending or falling over during wind and rain. Reduce the need for staking through variety selection, proper spacing, well-timed division, and avoiding excessive fertilization or water.