In April, grasses are trimmed back close to the ground, and very quickly, a new plant will begin to emerge. Based on their growth style, grasses fall into two primary groups.
Cool season grasses take off quickly in early spring and achieve their full size before the heat of summer hits. They are usually low to medium-sized plants and can sometimes brown out in hot weather. If this should happen, trim them back in July to encourage lush new growth for fall. You can create additional plants for other parts of your garden by splitting them with a sharp spade in late summer or early spring.
Warm season Grasses are spectacular for the late summer and fall garden with their distinctive clusters of tiny flowers called 'florescence' that wave softly at the end of long stems. They flourish in warm temperatures and generally like lots of light. This group can be divided in early spring only.
All this information, as well as mature size, zone hardiness, soil and light preference, how to plant, where to plant, major attributes like colour and form, is indicated on the tag that comes with each Ornamental Grass.