sentence: Garlic mustard is another.
sentences_before: Invasive species are a big problem with prairies. Since fires cannot burn freely, many new species are taking over, and preventing sunlight from reaching shorter plants. In the United States, European buckthorn is a common problem.
sentences_after: Often areas that once held a hundred different species of plants now only has three or four species.
concept_name: garlic mustard
headings: Prairie restoration Invasive plants and trees