Invasive Garden Loosestrife Spraying to Restart

July 29th, 2010 by UWBG Horticulturist

Lysimachia vulgaris imageFor a second year, Northwest Aquatic Eco-Systems along with UW Botanic Garden will begin spray work to control Lysimachia vulgaris (garden loosestrife), a state-listed noxious weed occurring along Union Bay shorelines including the Union Bay Natural Area and the Arboretum’s Foster and Marsh Islands the first week of August.  King County requires control of this aggressive and invasive weed, which poses a serious threat to the native character of area wetlands. In 2009, DoE provided a 5-year grant for $75,000 to fund loosestrife control.

In mid-July members of King County’s Noxious Weed Control Program and UW Botanic Gardens staff mapped the extent of the weed in the areas listed above.  Comparison of the maps from year 1 to year 2 demonstrated slight control had taken place.  Once again the weed will be controlled with an aquatically approved herbicide by the contractor, Northwest Aquatic Eco-Systems using airboats and other specialized equipment.

King County Garden Loosestrife Fact Sheet

Tags: , ,

2 Responses to “Invasive Garden Loosestrife Spraying to Restart”

  1. Amy Davis says:

    Can you please tell me if the loosestrife spraying has begun (at UBNA), and if so, when it was last sprayed at UBNA?

    Also, is there any way to find out ahead of time what the general schedule is (barring weather complications, of course), for health reasons?

    Thank you

  2. David Zuckerman says:

    Amy – Yes, initial spray was commenced Monday and continued Tues. There will be one more day scheduled next week. When I get confirmation I will post the next scheduled spray (24hrs prior) at all key Union Bay canoe landings and trailheads, as well as, WAC, Graham Visitor Center and Merrill Hall. Also, all adjacent landowners have been notified too. I will also post on this website.