GardenSmart Oregon For Master Gardeners
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GARDENSMART OREGON
A Guide to Non-Invasive Plants
Linda R McMahan, OSU Extension Service, Yamhill County
OSU Plant ID Pictures used by permission of Patrick Breen © Oregon State University
Download at: http://extension.oregonstate.edu/catalog/pdf/ec/ec1620.pdf
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This publication is a “landmark collaboration” among many organizations, including the City of Portland, Oregon Public Broadcasting, the Oregon Association of Nurseries, and the OSU Extension Service
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PART OF “THE SILENT INVASION” GardenSmart was part of a campaign
throughout Oregon to raise awareness about invasive species.
The following slide shows the Oregon Public Broadcasting webpage on this campaign, called “The Silent Invasion” as it appeared last year.
As an exercise, visit the current website and explore it for additional information.
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http://www.opb.org/programs/invasives/
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Invasive Facts – Invasive Species are A Serious ProblemInvasive Species Defined - a species that is non-native or alien to the ecosystem under consideration and whose introduction does or is likely to cause economic or environmental harm or harm to human health http://www.wildflower.org/invasive/PW_Brochure.pdf
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Invasive Facts http://www.wildflower.org/invasive/PW_Brochure.pdf
• Invasive species are the # 1 threat tonative biodiversity on protected lands• Invasive plants are spreading overapproximately 1,729,730 acres per year of U.S. wildlife habitat• Scientists estimate that invasive plants cost our economy $35 billion or more in damages and treatment each year
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THE IDENTITY OF SOME OF OUR INVASIVE SPECIES MAY SURPRISE YOU
For example, take a look at the poster shown on the next slide. This was published by the City of Springfield, Oregon
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http://www.ci.springfield.or.us/ESD/ButterflyBush.jpg
A new “look” at butterfly bush courtesy of the City of Springfield OR
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SO WHY IS GARDENING SO IMPORTANT FOR INVASIVE SPECIES?
The plants featured in GardenSmart Oregon were introduced intentionally, primarily for gardens and landscapes
4,000 or more plant species are introduced into the US, 1 in 10 have become invasive, and half of these are of horticultural origin
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HERE ARE SOME OF THE GARDENING PATHWAYS FOR INVASIVE PLANTS
Intentional planting for ornamental value, such as butterfly bush
Seed mixes that contain plants with invasive potential or unintended weed seeds
Weed seeds as contaminants in bird seed
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A Closer Look at GardenSmart Oregon
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GardenSmart Oregon features information about known invasive plants and provides garden alternatives
Included is one featured native plant and several additional Oregon native plants for each invasive ornamental
One featured “ornamental” plant and other alternatives as well
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Butterfly bush as shown in GardenSmart Oregon
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Butterfly bush Invading a creekside in Oregon’s lower elevation Cascades
Photo courtesy of Brad Withrow-Robinson, OSU Extension, used by permission
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GardenSmart Featured Native Plant: Blueblossom
Ceanothus thyrsifolius
http://oregonstate.edu/dept/ldplants
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GardenSmart Featured Ornamental Alternative
Meyer lilac – Syringa meyeri
http://oregonstate.edu/dept/ldplants
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Another ornamental that has become invasive: English ivy – Hedera helix – invading Forest Park in Portland
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ANOTHER EXERCISEVisit the OSU Extension Yamhill County Site to view a fact sheet on controlling English Ivy. http://extension.oregonstate.edu/yamhill/controlling-invasive-plants
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GardenSmart Featured Native – Dunes Strawberry
Fragaria chiloensis
http://oregonstate.edu/dept/ldplants
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Gardensmart Featured Ornamental – Allegheny Spurge
Pachysandra procumbens
http://oregonstate.edu/dept/ldplants
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Creeping raspberry
Rubus calycinoides
http://oregonstate.edu/dept/ldplants
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WHAT YOU AS GARDENERS CAN DO Learn about invasives. Read
GardenSmart Oregon Start at home. Remove invasive species
or interrupt their reproduction by deadheading or other methods
Don’t trade invasive plants with other gardeners
Check the contents of seed mixes before you purchase or plant them
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WHAT YOU AS GARDENERS CAN DO (MORE)
Support nurseries that offer alternatives to invasive plants
Be especially careful if you have a water garden to keep plants from entering native waterways
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WHAT YOU AS GARDENERS CAN DO (MORE) Share the word with other
gardeners Join a local group that helps
eliminate invasive plants from natural areas
Dispose of invasive plants appropriately
Check plant pots before you plant them to catch the “hitchhikers”
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SOME THINGS I LEARNED FROM WORKING ON GARDENSMART . . . The featured native plants tend to be
more drought tolerant than the “ornamentals”
Many of the plants often recommended are invasive somewhere in the world
US natives from other states are showing fewer invasive tendencies in the rest of the US than are Asian and European species
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THANK YOU!
Yellow Flag Iris, a recently listed Oregon invasive plant
I hope you have enjoyed this brief introduction to GardenSmart Oregon and Invasive Species Information
Stay tuned to new information on invasive species as it emerges