Garden Invaders - Recognizing and Removing Invasive Plants


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Our gardens are a great place to start identifying and eradicating harmful and invasive weeds. This class covers the most common garden invaders (including pesky weed species) and best practices for making sure they leave, and don’t come back.

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Garden Invaders - Recognizing and Removing Invasive Plants

  1. 1. January 2012 © Independence Gardens LLC Garden Invaders Independence Gardens Portland, OR Download the handout that goes along with this slideshow! h p://, January 31, 2012
  2. 2. What We’ll Cover Today Intro 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
  3. 3. What We’ll Cover Today Preview Topics We’ll Cover Got Questions? • Top four baddie invaders Please ask as we go along. • Weeds: invasive, noxious, or just annoying? • Other garden invaders • Recommended prevention. control, & disposal methods • Resources • Take-home messageTuesday, January 31, 2012
  4. 4. And Some Other Options Our “favorite” garden invaders Himalayan blackberry English ivy Bu er y bush Field bindweed Why are these “favorites”? Because we don’t feel particularly con icted about removing them...Tuesday, January 31, 2012
  5. 5. And Some Otherblackberry Control for Options • Manual removal of canes • Manual removal of rootballs • Mow (or use goats) to prevent foliage regrowthTuesday, January 31, 2012
  6. 6. And Some Other for ivy Control Options • 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 backTuesday, January 31, 2012
  7. 7. And Some Other Options Control for bu er y bush • Intervene before it goes to seed... • “One-cut pruning” • Remove stumps manually (or get help...)Tuesday, January 31, 2012
  8. 8. And Some Other bindweed Control for Options • Remove vines • Reproduction occurs by rhizome, so try not to leave pieces • Solarize • Apply thick sheet mulch • Monitor (esp. edges)Tuesday, January 31, 2012
  9. 9. And Some Other Options Weeds that aren’t so bad White clover Trifolium repens Li le western bi ercress Cardamine oligosperma Plantain Plantago major Chickweed Red deadne le Dandelion Stellaria media Lamium purpureum Taraxacum officinaleTuesday, January 31, 2012
  10. 10. Why Compost?difference? What’s the • 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
  11. 11. 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 -cidesTuesday, January 31, 2012
  12. 12. Why Compost? “Oopsies” Parallel invaders: • 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 ASAPTuesday, January 31, 2012
  13. 13. Why An ounce of prevention... Compost? • “Being there” - Observation, then intervention • Focusing on maintaining soil health and encouraging desired plants’ growth • Watering YOUR plants, not the whole garden areaTuesday, January 31, 2012
  14. 14. Why Prevention: Raised beds Compost? • 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 seedsTuesday, January 31, 2012
  15. 15. Why Compost? crops & mulch Prevention: Cover • Nature abhors a vacuum (and bare soil, too) • Cover crops are noninvasive/non- irritating competitors • Mulches smother weeds/prevent photosynthesisTuesday, January 31, 2012
  16. 16. Why Compost? Hoes! Removal: • 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 itTuesday, January 31, 2012
  17. 17. Why Compost? Removal: Other tools • Hand pruners • Loppers • Saws • Machetes • Hori-horis • Lawnmowers • Fire: don’t (just) play with it!Tuesday, January 31, 2012
  18. 18. 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 safetyTuesday, January 31, 2012
  19. 19. 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
  20. 20. Common pitfalls • Time constraints • Lack of consistency • Discomfort with eliminating living things • Improper technique • Trying to eliminate ALL weedsTuesday, January 31, 2012
  21. 21. 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 helpTuesday, January 31, 2012
  22. 22. Resources Do this! • Oregon noxious weeds lists: h p:// PLANT/WEEDS/ statelist2.shtml • Weed identi cation: h p:// weedidenti cation.htm • Paci c Northwest’s Least Wanted List: catalog/pdf/ec/ec1563.pdf Not this.Tuesday, January 31, 2012
  23. 23. Got Questions?Tuesday, January 31, 2012