Cut the plant down to 4 to 6 inches in early spring before new growth starts. When the center starts to die - you'll notice a lack of foliage in the middle, then dig up the entire plant, split it and replant. Some authors advise waiting to cut it down until after it is divided. It sometimes help to have something to grasp as dividing can be difficult. Some grasses have sharp edges so wear good gloves if your pennisetum is one of these.
Answered on January 20, 2018
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