Seeing Purple: A Population Explosion

Through a simulation, sampling, and estimation activity, students learn about the impact of purple loosestrife on a wet land due to its exponential growth. They learn about purple loosestrife’s life cycle and appreciate how scientists determine population size in an ecosystem.


  • Recognize purple loosestrife and tell how the seeds are dispersed.
  • Describe that purple loosestrife produces over 2 million seeds and have a concept of how much that really is.
  • Determine the population of purple loosestrife seeds for their wetland ecosystem through sampling.

External Curriculum Materials


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