The more full and beautiful an ornamental grass is, the messier it is when cut down. To lessen the mess of long grass blades spilling throughout your garden, use this quick and easy technique for cutting back ornamental grasses.
Start by wrapping around the circumference of the grass. I like to use tape, because it helps hold the blades together, and I prefer a biodegradable paper tape, so I can toss the whole thing into the compost. But any wide tape will do, as long as it's sticky enough to keep a hold on the grass blades. As an alternative, many gardeners like to use bungee cords. Wrapped tightly, they should hold together long enough to get you to the compost, where you can spring them loose.
Depending on the width and height of the ornamental grass, you may need to wrap tape in 2-3 positions along the height of the grass and possibly divide the grass blades into 2-3 bundles. The grass shown here is relatively young and can be bunched whole.