What are examples of invasive plants?



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    Some invasive species in the U.S. are Autumn Olive, Purple Star Thistle, and Kudzu.  For a more comprehensive list of invasive plants as well as some information on each, click the link below.

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    This could be a long list, so I will only list a few so that other GreenAnwer members can provide some examples as well. Each region is going to have its own invasive species, and what is invasive in one region is not necessarily invasive in another region.

    Kudzu– a vine originially from Asia that has grown out of control in the southeastern U.S.

    Himalayan blackberry–throughout the Pacific Northwest it grows fervently along roadsides, but the berries are delicious!

    Scotch broom–grows agressively throughout the Pacific Northwest, mostly in disturbed locations, and creates pure stands making it challenging for native species to grow.

    Japanese Knotweed–originally from Eurasia, Japanese Knotweed was first introduced as an ornamental and now it grows rampantly along roadsides and other disturbed areas, particularly in the Pacific Northwest.  While it does replace native vegetation, its great forage for honey bees.

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      Is the scotch broom blooming yet? Successful in its invasion though it is, that couple weeks of yellow and red washed over everything is incredibly beautiful.

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      I took a trip up to Seattle in the beginning of the month and it was just beginning to bloom. Over here on just on the eastern edge of the Cascades and up a couple thousand feet, spring comes more slowly, as does the invasion of scotch broom. But the little that is here has yet to bloom. You are right though, it is a bit of a love-hate relationship.

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    Another example of an invasive plant species is the Water Hyacinth (Eichhornia crassipes). It was initially introduced as an ornamental plant and is now in 50 countries and on 5 continents. In California it has replaced the nattive pennywort which had occupied a similar habitat. Due to this plants rapid growth, it limits water transport and redues oxygen and light levels in the water. 


    Hydrilla verticilata is also another example of an invasive plant species. This plant is an aquatic invader, covering nearly 100,000 surface acres of water in Texas. This plant causes numerous problems for the native ecosystem. It depletes water of oxygen and blocks sunlight, killing off many native plants and animal species. 

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    Where I live, wild raspberries are extremely invasive. They are in the process of taking over my entire property. If they weren’t so delicious, I’d look for a way of getting rid of them. Maybe next year…

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    English ivy is another common invasive plant. It’s native to Europe, and was brought here for ornamental gardens. It can overpower native understory plants and also damage trees.


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    Purple Loosetrife is a beautiful plant with a brilliant purple flower. It has invaded areas around the Great Lakes in America and is choking out wetland areas. Native plants and animals are dying.
    People are tempted to plant this plant in their yard because the flower is very beautiful. However, this is a terrible idea because it spreads very quickly and the seeds could be disbursted to area wetlands.

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