Alien invasion threatens Sisters

Aliens have invaded and they are taking over the town of Sisters. New colonies are forming everywhere.

But don't call the X Files; these green aliens are not from outer space. They are aggressive, nonnative plants, noxious weeds which are rapidly degrading native plant and wildlife habitats and eroding land values in Central Oregon.

Look carefully at local roadways, the industrial park, and vacant lots. You'll notice that areas which supported native shrubs and wildflowers a year ago are now dominated by Spotted or Diffuse Knapweed.'

These incredibly successful species can produce up to 25,000 seeds per plant. Seeds travel by wind or are carried to new sites in vehicle tire treads. Knapweeds gain a competitive edge by exuding chemicals into the soil which actually inhibit other plants from growing. Because seeds can last up to eight years in the soil seed bank, once these plants have established on your property you have a long-term problem.

Creeping along our streams, Scotchbroom and Dalmation Toadflax have pretty yellow flowers but ugly environmental consequences as they out-compete native plant species. Old clearcuts bloom with Tansy Ragwort which came from the westside on logging machinery. Tansy has a cute, yellow daisylike flower but is loaded with toxic alkaloids that poison wildlife and horses. Bull Thistle can ruin your day and recreational experience with its penetrating spines.

Two events are scheduled for next week to help community residents learn more about these dangerous plants.

The Deschutes Watershed Council will host a Noxious Weeds Awareness Day, June 24 from 9 a.m. to 1 p.m., at Aspen Hall at Shevlin Park. Educational presentations and a field tour are planned. Contact Coordinator Barbara Lee , 3892204, by June 19 to reserve a free spot.

The Sisters Ranger District will host a Weed Education/Weed Pull on June 24 from 9 to noon.

Participants will learn to identify Spotted and Diffuse Knapweed and help control infestations in town. Wildflower identification will also be featured. Participants should meet at the Ranger District office at 9 a.m. and bring gloves, and drinking water.

Maret Pajutee is the District Ecologist for the Sisters Ranger District