Panicum 'Northwind' is propagated by division. The most successful results are obtained when they are divided in the late winter while the plants are dormant or just as new growth resumes in the early spring.
Can you divide Panicum?
Grasses from warm climates (such as Arundo, Cortaderia, Imperata, Miscanthus, Panicum, Pennisetum, Phalaris and Spartina) require only infrequent division.
When can you split ornamental grasses?
Divide warm season grasses anytime spring through mid-summer. All ornamental grasses should be divided when they are actively growing but not while they are flowering. If the plants are dormant when they are transplanted they won't establish a good root system.