Natural Ornamental Grass Used in Landscaping

Types of Grasses

• The term "ornamental grass" refers to true grasses (Graminea), as well as many plants that resemble grasses, including sedges (Cyperaceae) and rushes (Juncaceae). Most natural ornamental grasses are perennials, living for two or more years. They may grow in a clump that gradually increases in size, or as a spreading plant. Ornamental grasses are "cool-season" or "warm-season." Cool-season grasses go dormant in the summer heat, while warm-season grasses go dormant during the winter months.

Ornamental Features

• Natural ornamental grasses provide a visual interest to the garden via color, texture and form. Foliage colors of ornamental grasses range from deep green and blue to red, purple or yellow. Many grasses change color in the fall. The textures of ornamental grasses vary, with some being very coarse, while others are fine and airy. Flowers on many ornamental grasses provide additional appeal, ranging from delicate clouds of tiny flowers, such as those on hairgrass (Muhlenbergia capillaris), to large plumes, such as the tall pink plumes of Korean feather grass (Calamagrostis brachytricha).

Landscape Use

• Natural ornamental grasses add variety to a landscape and can be used in formal gardens, such as water and rock gardens, as well as for traditional landscape uses, serving as shrubs or privacy screens. They are often incorporated into perennial flower beds as borders, and provide a solid backdrop for annuals. Ornamental grasses are easy to grow in containers, and are ideal for patio and poolside use.

Invasive Potential

• Some types of ornamental grasses are considered invasive and should not be planted due to the danger they may present to natural areas and wetlands. Invasive species of ornamental grasses spread rapidly and aggressively through vigorous seeding. Consult your local extension office or garden center for advice regarding species that are invasive. Many commonly used grasses are considered invasive. Pampas grass (Cortaderia selloana), for instance, often used in landscaping for its impressive white plumes, is recognized as a pest in California.