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Pulling weeds is satisfying, perhaps even therapeutic. The act is particularly rewarding when you pull them with others.

This Saturday, Oct. 26 is Portland Parks & Recreation's 21st annual No Ivy Day — a day that strikes fear into the roots of invasive vines growing across the metro area.

Ivy, you gotta go

English and Irish ivy are invasive species that can take over areas when left unchecked, carpeting the ground and climbing up trees. Ivy can eventually weaken a tree to the point of death, or add enough weight to topple it. The plants' shallow roots can also contribute to erosion.

Lend a hand

Parks officials and partnering organizations will host more than a dozen No Ivy Day events across several neighborhoods on both sides of the Willamette River. Browse the event lineup + register online; if you can't make it, consider joining a No Ivy League work party held the first Wednesday and the first + second Saturdays of each month.