Do I leave purple fountain grass
in the ground this winter?

Purple fountain grass is an annual even though many big box stores try to sell it as a perennial. It will die in the winter. If you would like a perennial grass, there are several other options to consider. The dead grass can be pretty in the winter and does not have to be removed in the fall. The brown grass provides structure to the planting and provides food for wildlife during the winter.

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Related Resources:
Pennisetum setaceum 'Rubrum' Purple Fountain Grass
Ornamental Grasses
Ornamental Grasses