When Oregon native plants become invasive

By Daily Digger
Oregon Association of Nurseries

Can a native also be considered invasive?

(photo: Eastern Oregon grassland with encroaching Western juniper. Photo courtesy of Oregon Department of Agriculture).

Dan Hillburn, administrator of the Oregon Department of Agriculture Plant Division, blogged on Saturday about the dilemma posed by Western juniper (Juniperus occidentalis) choking out grassland habitat in Eastern Oregon.

As he explains, these trees are native, but the Native Americans used to burn them in order to keep the space open. Now that this no longer occurs, the junipers are gradually taking over and causing a whole host of problems, including degraded wildlife habitat. The junipers also hog the area’s scarce water. Consequently, there’s been some call to declare the tree a noxious weed. But Hillburn dismisses that possibility, given that that the Western juniper is native to the area it is supposedly invading. (Now there’s a paradox.)

So what to do? Logging the trees is cost prohibitive for what wood they can provide, and burning them would probably engender public opposition. Hillburn sits on a working group that is trying to tackle the problem, while Oregon State University is coordinating an ongoing effort to find other commercial uses for harvested junipers.

The Oregonian newspaper (Portland, Ore.) ran an article in February talking about the problems.

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