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Understanding Purple Loosestrife: Life Cycle & Identification Tips

Learn to identify Purple Loosestrife throughout the seasons. Explore its life cycle stages and characteristics. Use observations for predictions and timelines. Compare with Galerucella beetles' life cycle.

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Understanding Purple Loosestrife: Life Cycle & Identification Tips

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  1. Purple loosestrife is easy to identify when in blossom. Lessoning Loosestrife

  2. Winter Spring Fall Summer Can you identify it in other seasons? Lessoning Loosestrife

  3. Can you identify it in other seasons? Which one is purple loosestrife? Lessoning Loosestrife

  4. Can you identify it in other seasons? Which one is purple loosestrife? Lessoning Loosestrife

  5. What part of the plant produces the seed? Do you think Purple loosestrife grows taller every year, or dies back and grows up again? What part of the plant continues living in the winter? Lessoning Loosestrife

  6. What part of the plant produces the seed? The job of flowers is to produce seeds. Does Purple loosestrife grow taller every year like a bush, or die back and grows up again from the roots ? Dies back. Plant grows up from stored energy in roots. What part of the plant continues living in the winter? The roots. Lessoning Loosestrife

  7. This is life cycle model for Phragmites, another invasive plant. Challenge: Observe purple loosestrife through the year and create a life cycle timeline for purple loosestrife Lessoning Loosestrife

  8. New Growth. Seeds sprout &grow. Spring Winter Old dead stalks remain Fall: Flowers go to seed. Summer, Flowers bloom Lessoning Loosestrife

  9. Make a prediction: When does your purple loosestrife growing season begin and end in your town? Read background information to help you with this. Observe to see what happens. Mar Apr Feb May Jan June Dec July Nov Aug Oct Sep dormant germination vegetation growth flowering and seed set Food in roots and seeds shed Lessoning Loosestrife

  10. Make a prediction: When does your purple loosestrife growing season begin and end in your town? Observe to see what happens. Mar Apr Feb May Jan June Dec July Nov Aug Oct Sep germination vegetation growth dormant Here’s a guess. Does your prediction look like this? flowering and seed set Food in roots and seeds shed Lessoning Loosestrife

  11. New Growth. Seeds sprout and grow. Spring Mar Apr Feb May Jan June Dec July Nov Aug Oct Sep Winter Old dead stalks remain Observe to seewhat really happens at your site. Take photos each season to record. ) Summer, Flowers bloom Lessoning Loosestrife

  12. Figure 3. Lifecycle of Galerucella calmariensis and G. pusilla. Solid colored bars represent the length of activity for each of the life stages. Short patterned bars for the upper three stages represent potential second generation activity. Lessoning Loosestrife

  13. Compare the life cycle of the Galerucella beetles and the purple loosestrife. Why do you think this plant is a good match for the beetles? Lessoning Loosestrife

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