What does "old witch grass" mean?

North American grass with slender brushy panicles; often a weed on cultivated land

What is a synonym for "old witch grass"?

Common synonyms include: old witchgrass, panicum capillare, tumble grass, witch grass, witchgrass.

Rare ·Advanced level

Noun

1
North American grass with slender brushy panicles; often a weed on cultivated land wordnet