Avoid injuries caused by the sharp pampas grass blades by wearing a long sleeve shirts, long pants and leather gloves. Poke around the base of the grass to make sure no small animals are nesting. Use a chainsaw or long-handled loppers to cut the blades near the base, leaving 6 to 8-inch long stubs. Apply 8-8-8 or 10-10-10 fertilizer around the plant to promote healthy growth. Prune pampas grass annually to give room to new foliage.
Pruning in late winter guarantees long, healthy plumes all year long. Reduce the size of pampas grass clumps every three years by digging out a third of the clump. Use an axe or a heavy duty saw to separate the roots.
Avoid overcrowding by removing smaller clumps every year when pruning. Eliminate unwanted pampas grass clumps by removing the grass and as many roots as possible. To prevent grass from regrowing, apply herbicide between late summer and early fall. Choose a herbicide with glyphosate, and wait 10 to 14 days for it to work. Glyphosate is a non-selective herbicide, so only apply it directly over the area were the unwanted grass grows.
Make sure pampas grass clumps are 6 to 8 feet apart. Propagate pampas grass in the spring by dividing a clump and replanting it elsewhere.