Garden Invaders - Recognizing and Removing Invasive Plants
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Transcript of Garden Invaders - Recognizing and Removing Invasive Plants
Garden Invaders
Independence GardensPortland, OR
January 2012© Independence Gardens LLC
Download the handout that goes along with this slideshow!
h!p://bit.ly/AgInWs
Tuesday, January 31, 2012
What We’ll Cover TodayIntro
we are Independence Gardens• We build raised beds, chicken coops,
terraces, trellises, & other garden infrastructure
• Help with garden design & planning, cleanup, prep, and installation
• Teach edible gardening classes
• & make Doo Tees!
Tuesday, January 31, 2012
Topics We’ll Cover• Top four baddie invaders• Weeds: invasive, noxious, or
just annoying?• Other garden invaders• Recommended prevention.
control, & disposal methods• Resources• Take-home message
What We’ll Cover TodayPreview
Got Questions? Please ask as we go along.
Tuesday, January 31, 2012
And Some Other OptionsOur “favorite” garden invaders
Himalayan blackberry English ivy
Field bindweed
Bu!er"y bush
Why are these “favorites”?Because we don’t feel particularly con!icted about removing them...
Tuesday, January 31, 2012
And Some Other OptionsControl for blackberry
• Manual removal of canes
• Manual removal of rootballs
• Mow (or use goats)to prevent foliage regrowth
Tuesday, January 31, 2012
And Some Other OptionsControl for ivy
• Remove foliage, vines, and roots manually
• Cut all vines that run up trees at base of tree- Ivy !owers and fruits on vertical
growth, so focus on ge"ing rid of it
• Use goats to help keep foliage from growing back
Tuesday, January 31, 2012
And Some Other OptionsControl for bu!er"y bush
• Intervene before it goes to seed...
• “One-cut pruning”
• Remove stumps manually (or get help...)
Tuesday, January 31, 2012
And Some Other OptionsControl for bindweed
• Remove vines• Reproduction
occurs by rhizome, so try not to leave pieces
• Solarize• Apply thick
sheet mulch• Monitor (esp.
edges)
Tuesday, January 31, 2012
And Some Other OptionsWeeds that aren’t so bad
Li!le western bi!ercress Cardamine oligosperma
PlantainPlantago major
ChickweedStellaria media
White cloverTrifolium repens
DandelionTaraxacum officinale
Red deadne!leLamium purpureum
Tuesday, January 31, 2012
Why Compost?What’s the difference?
• Good weeds a"ract bene#cial insects, give clues about our soil quality, add nutrients to our gardens, and feed us
• By de#nition, invasive weeds are non-native & were introduced here; they tend to be aggressive competitors for space & resources
• Noxious weeds have a negative economic impact and are regulated by federal & state governments
• We focus on removing invasives and noxious weeds, and tend not to worry as much about the others...
Tuesday, January 31, 2012
Why Compost?Parallel invaders: Pests
• Similar to weeds, pest invaders require:- Positive identi#cation- Familiarity with method
of reproduction/spread- Properly timed
intervention- Effective use of
deterrents- Responsible use of -cides
Tuesday, January 31, 2012
Why Compost?Parallel invaders: “Oopsies”
• Oopsies = plants that have reproduced without your permission
• Similar to other weeds, “oopsies” require you to- Notice early- Observe functions/let them
serve those f ’ns if appropriate (e.g. pollinator a"ractors)
- Remove ASAP
Tuesday, January 31, 2012
Why Compost?An ounce of prevention...
• “Being there”- Observation, then
intervention
• Focusing on maintaining soil health and encouraging desired plants’ growth
• Watering YOUR plants, not the whole garden area
Tuesday, January 31, 2012
Why Compost?Prevention: Raised beds
• Effective barrier to weeds that spread by rhizome
• Loose soil makes weeds easy to pull out
• Still have to monitor for oopsies and bird-dropped/wind-blown seeds
Tuesday, January 31, 2012
Why Compost?Prevention: Cover crops & mulch
• Nature abhors a vacuum (and bare soil, too)
• Cover crops are noninvasive/non-irritating competitors
• Mulches smother weeds/prevent photosynthesis
Tuesday, January 31, 2012
Why Compost?Removal: Hoes!
• Plants can’t make food if foliage is disconnected from roots
• Use the hoe to cut the plant just below the soil surface
• Adjust blade angle so you don’t have to bend to use it
Tuesday, January 31, 2012
Why Compost?Removal: Other tools
• Hand pruners• Loppers• Saws• Machetes• Hori-horis• Lawnmowers• Fire: don’t (just) play with
it!
Tuesday, January 31, 2012
Why Compost?Disposal
• Commercial composting (pu"ing it out in your yard debris roll-cart) is the best bet
• Non-noxious weeds that have not gone to seed can be composted in a backyard system
• If you do use chemicals, don’t assume safety
Tuesday, January 31, 2012
A note on herbicides
• Please...avoid weed & feed & other non-speci#c products
• Follow IPM hierarchy (chemical control comes in dead last)
• Look for pre- and post-emergent control products that are OMRI-listed, if possible
• ALWAYS read the label and ALWAYS follow instructions
• Wear your PPE!
Tuesday, January 31, 2012
Common pitfalls
• Time constraints• Lack of consistency• Discomfort with
eliminating living things
• Improper technique• Trying to eliminate
ALL weeds
Tuesday, January 31, 2012
Take-home message
• Some weeds are way worse than others
• Your involvement is key• Include others in your
garden routine if at all possible
• Don’t let a problem become a Problem
• It’s OK to ask for help
Tuesday, January 31, 2012
Resources
• Oregon noxious weeds lists: h"p://www.oregon.gov/ODA/PLANT/WEEDS/statelist2.shtml
• Weed identi#cation: h"p://mint.ippc.orst.edu/weedidenti#cation.htm
• Paci#c Northwest’s Least Wanted List: extension.oregonstate.edu/catalog/pdf/ec/ec1563.pdf
Do this!
Not this.
Tuesday, January 31, 2012
Got Questions?
Tuesday, January 31, 2012