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Invasion of the Habitat Snatchers

2/14/2023

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PictureEnglish Ivy
Invasives – every gardener's worst nightmare. The nasty alien invaders creep up from the soil choking out the native flora you've so carefully nurtured to benefit the local insects and wildlife. A few days ago, everything was fine, but now English Ivy is sprouting up.

The vines were spotted creeping up the trees in a wooded lot down the road a couple of years ago, but you never dreamed it would be a problem in your landscape. Surprise! Not only do the aggressive plant's roots travel underground, but birds and animals also carry the seed-filled berries hither, thither, and yon. 
 
Invasive plants are not just a problem for homeowners. The blasted things are everywhere! The National Wildlife Federation reports that thousands of native-plant species are at risk of extinction. According to NWF's chief scientist, Bruce Stein, "If we are interested in conserving the diversity of life on Earth, we need to be very concerned about the large numbers of at-risk and declining [native] plants."

These quick-growing and at times, very aggressive plants take over the land, choking out the native species that have no defense against the overwhelming bullies. As a result, conservationists working to restore woodlands, prairies, wetlands, and other threatened ecosystems spend countless hours removing destructive plants only to have more unwanted seedlings spring up in their place. From my perspective, it's a never-ending battle, and I'm not sure who's winning.

What is an Invasive species? According to the USDA, it is defined as a species that is non-native (or alien) to the ecosystem under consideration and whose introduction causes or is likely to cause economic or environmental harm or harm to human health. 
​
Why are invasive plants successful? According to the U.S. Forestry Service:
  • They produce large quantities of seed.
  • They can thrive in any type of soil.
  • Invasive plant seeds are often distributed by birds, wind, or humans, allowing them to move great distances.
  • Some Invasives have aggressive root systems that spread long distances from a single plant.
  • These root systems often grow so densely that they smother the root systems of the surrounding vegetation.
  • Some plant species produce chemicals in their leaves or root systems, which inhibit the growth of other plants around them.

PictureWild Parsnips
What are the impacts of invasive plant species? First, they can spread rapidly, displacing the diverse vegetation indigenous insects and wildlife depend on to survive. For instance, have you ever noticed roadsides and fields overrun with flat-top clusters of yellow flowers? Even though wild parsnip attracts pollinators, the invasive plant spreads greedily, displacing native vegetation and reducing habitat for wildlife.

The U.S. government estimates the cost from invasives to be $120 billion, with more than 100 million acres affected, an area about the size of California. The Forestry Service reports that the establishment and spread of invasives:
  • Have contributed to the decline of 42% of U.S. endangered and threatened species and 18% of U.S. endangered or threatened species.
  • Compete directly with native species for moisture, sunlight, nutrients, and space.
  • Decrease overall plant diversity.
  • Can degrade wildlife habitat.
  • Results in poor quality agricultural lands.
  • Degrades water quality.
  • Increases soil erosion.
  • Decreases recreation opportunities.
These impacts change nature's balance on which all species depend.

Where do invasive plants come from? Stores and nurseries sell what the public wants. Therefore, they stock listed invasive plants such as butterfly bush and burning bush. They also import exotic flowers, shrubs, bushes, and trees from other parts of the world, selling them to homeowners across the country. 

However, the importation and spread of non-native plants aren't anything new. It's been going on since immigrants settled in America. Colonists brought many plants from their homelands, and the foreign grasses and flora were sown from the east coast to California as the settlers migrated west. It was one of our ancestors who originally planted that bothersome English Ivy around their homestead. Unfortunately, when folks discovered the plant was a nuisance, it was too late, and we have been suffering the consequences ever since.

I have to note, though, not all invasives are imported. A plant might be native in one area of the country but a listed invasive in another. For example, crownbeard daisies are native to Colorado but are invasive In Hawaii.

What plants should we avoid?
Ecowatch lists ten of the most invasive species in the U.S. as:
  1. Bamboo
  2. English Ivy
  3. Callery or Bradford Pear Trees
  4. Wisteria Sinensis
  5. Cogongrass
  6. Purple Loosestrife
  7. Japanese Honeysuckle
  8. Winged Burning Bush
  9. Norway Maple
  10. Barberry
We can also add kudzu, butterfly bush, black locust, Japanese knotwood, common buckthorn, Dame's rocket, and giant hogweed to the list. However, that's only the tip of the iceberg. There are thousands of species of invasives across the country.
 
Are all non-native plants invasive?
NO!  There's a big difference between non-native and invasive. Non-native simply means the plant was introduced to an area. The plant could have originated in a different region of the U.S. or be from Europe or Asia, but a non-native does not pose a threat to native plants. They may not support the local ecosystem's health as well as native plants do such as 
dandelions and clover, but they do no harm. Other non-native species include petunias, hyacinths, zinnias, and many food crops such as rice, wheat, and tomatoes.
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How to know what's invasive?
To know if a plant is native, non-native, or invasive, ask local experts. Pick the brain of someone from a WildOnes Chapter or your state's native plant society. In addition, check out state and county resources, university extension offices, master gardeners, clubs, and conservation organizations. You can find information online too.

Play it safe. Before putting an exotic in your garden, try to find a native alternative, i.e., Rudbeckia instead of zinnias.

Consider a plant's potential for getting away from you. Certain herbs are better placed in a confined area where they cannot escape.

Do your homework and know what you're getting into before you go shopping. It may take time, but it's better to be safe than sorry.

Happy Gardening, everyone!

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    Greta Burroughs

    I am passionate about cleaning up our environment and restoring the habitats/ecosystems necessary for pollinators and wildlife to flourish.
    ​
    Yet, Pollinator Conservation and Environmental Restoration involve more than just planting trees, flowers, and shrubs. In order to regain the balance Mother Nature intended, we need to also counter pollution, global warming, overuse of pesticides, and destruction of ecosystems.

    ​By publishing articles, essays, and resources on this blog, I hope to Educate, Encourage, and Empower others to find a niche where they can make a difference in this world.

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I will read forever because it lets me visit in my mind the worlds that I will never be able to see; it helps me put away the stresses of the day and relax into the rhythm of the story before me; it lets me bring to the surface and experience without regrets those feelings I hide away; it lets me re-experience the thrill of first love through someone else's eyes; it keeps my mind juiced so that it will never desert me; it is always there for me even when there's no one else. I will read forever no matter whether it is print or digital because the words will always call to me. ~ A Sassy Scribbler