Invasive plants can be hard to control in protected natural areas, especially when they form dense thickets that crowd out native vegetation. Yosemite National Park in California has spent years tackling this problem, using different methods to limit the spread of aggressive non-native plants. One treatment in Yosemite Valley produced a striking result within a year: according to the National Park Service’s Treatment of Invasive Plants page, a Himalayan blackberry infestation fell from 8.65 acres to just 0.34 acres.
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