Growth Habit: Ornamental grasses vary widely in their growth habits - each product page includes information on the growth habit of each plant cultivar. Ornamental grasses can grow up to 6 feet tall and up to 3 feet wide - as mentioned above, use shopping filters to find the right plants for your yard.
Staking: Ornamental grasses with upright habits should be sturdy enough to stand tall on their own without staking. However, full-sun grasses that don’t receive enough light may have weaker stems and are more likely to flop over in the wind. Also, too much nitrogen fertilizer will stimulate tall, weak stems. If you find that your grass is flopping, you can tie tall grasses to stakes in summer to support them.
Mounding grasses, and species with arching foliage, also should not need staking.
Watering: Ornamental grasses are generally drought tolerant once established. However, it's good to water young grass transplants frequently until they get established. It's also important to grow the right grass type for your region. Grasses that require more water may not be good choices for drier areas of the country.
Pests & Disease: Young plants and new growth can sometimes have aphids and spider mites on the foliage. Sprays of insecticidal soap can kill them.
Diseases such as rust and powdery mildew can also affect ornamental grasses. To prevent disease, space plants further apart and clean up trimmings well in winter or early spring to remove any fungal spores in the area.
Ornamental grasses are generally deer resistant, but you may find that your grass gets nibbled by rabbits or deer occasionally showing interest in younger plants with more tender leaves. Repellent sprays containing garlic, pepper, and cayenne can be rotated and applied on the foliage to keep deer and rabbits away.