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 Within just one square mile, there could be more than a million plants

Arid/Desert Ecosystems: Areas with plants like Ocotillo, Prickly Pear, and Mesquite can have very high densities of thorny species, as thorns are an evolutionary adaptation for defense against herbivores and water retention.
  • Invasive/Degraded Areas: Invasive, thorny species can dominate landscapes. For example, some locations can be completely overtaken by invasive shrubs or vines, such as blackberry (Rubus sp.), which can cover vast areas.
  • Density Examples:
    • High-Density Examples: Certain dense shrublands or desert washes can contain thousands of thorny plants per acre (640 acres in a square mile).
    • Invasive Coverage: A "mile-a-minute" vine or dense blackberry thicket could theoretically produce hundreds of thousands of individual stems and thorns over a single square mile

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