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Invasives Workshop for Gardeners 2.18.11
This document provides an overview of invasive species for gardeners. It defines invasive species as alien species that cause economic, environmental, or health harm. Invasive species cost Americans $143 billion per year by destroying habitats and outcompeting native plants and animals. The document discusses the biology and management of invasive species and provides examples of common invasive plant species in the region. It recommends actions gardeners can take to prevent the spread of invasives, such as growing native plants, properly disposing of plant materials, and monitoring for new invaders. Resources for more information on invasive species are also listed.
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Invasives Workshop for Gardeners 2.18.11
- 1. Invasive Species 101: A Primer for Gardeners Robert Emanuel, Ph.D. Water Resources and Community Development Faculty, Tillamook and Clatsop counties
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- 3. Invasive species meansan alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health.
- 6. Biological invaders destroy habitats or out‐compete native plants and animals. Why should we care? Invasive species costs Americans about $143 billion/year! At least 30 new potential biological invaders enter the US every day…
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- 8. Definitions: Invasive Plants “Weed” Exotics A plant (non‐native) growing where you do Lots of beneficial not want it. species: Crops, pasture, forestry “Noxious” & ornamentals. A regulatory designation. “Invasive” Spreads outside of Natives cultivation, and Co‐evolution causes human, with other environmental, species, our economic harm. natural heritage
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- 10. Key Stages in Plant Invasions New Range Limits? Escape Adaptation? Lag Time Invasion Introduction Area Infested Time
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- 18. Photo ‐ knotweed Knotweed: Fallopia x bohemicum
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- 23. English Ivy Photos –black walnut tree covered 2002 by English ivy 2006
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- 35. Photo: University ofGeorgia Herb Robert: Geranium robertianum
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- 38. Photo ‐ butterfly bush infestation in Lane Co. Butterfly Bush (Buddleia davidii) Photo: OSU
- 39. Photo – butterfly bush infestation in Lane Co. Butterfly Bush: Buddleja davidii
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- 50. Photo: Kurt W.Heckeroth Petasites japonica var. giganteum
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- 52. Photo: University ofGeorgia Hydrilla verticillata
- 53. Photo: Nancy Ness,Grays Harbor, WA; insert: King County Yellow Archangel: Lamiastrum galeobdolon
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- 59. Tree of Heaven: Ailanthus altissima Photo: USFS
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- 67. If you have a known invasive (but can’t part with it) Deadhead faithfully Use root barriers Dispose of plant material properly—bagged in the garbage or burned (completely) Please don’t share your invader with others! Contain it, control it, or cage it!
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