It may not look all that ‘noxious,’ but … – Hasso Hering
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A perspective from Oregon’s mid-Willamette Valley

It may not look all that ‘noxious,’ but …

Written July 15th, 2018 by Hasso Hering

By landing where it did, this butterfly called my attention to the subject of noxious weeds. For a “noxious weed” is what, 14 years ago, the Oregon Department of Agriculture declared this flowering bush to be.

We are looking at a butterfly bush, or Buddleia davidii, in a West Albany yard. The Ag Department listed the species as a noxious weed in 2004 and reiterated its assessment in 2016.

“If you planted your butterfly bush before it was listed (2004),” the agency says, “you do not have to remove it, but you are required to prevent it from propagating. You must deadhead the plant after blooming to prevent the seeds from spreading.”

“Required …,  must …”?  Do people know this? If they know it, have they actually done so?

Buddleia davidii is said to be native to China and Japan. Because its flowers look nice and attract butterflies, people like it, and the plant has spread in Europe and on the American coasts, among other places around the world. It readily establishes itself in disturbed soil such as along roadsides and riverbeds.

As far as gardens are concerned, the problem seems to be that while the flowers provide ample nectar, the plants tend to displace other types of vegetation that butterfly larvae need for nourishment. And when the larvae disappear, certain bird species vanish too.

The state  has approved the sale of a number of sterile Buddleia cultivars. But the one in the photo, planted long before the 2004 listing, looks like the online photos of the invasive kind.

You can find out all there is to know about what Oregon says about butterfly bushes on the Ag Department’s website here. And then, if you have one of these bushes in your yard, better get ready to chop off the flowers when the time comes. (hh)

The nectar is what had this fluttering customer coming back.


4 responses to “It may not look all that ‘noxious,’ but …”

  1. Aubrey Cloud says:

    Douglas spirea is an excellent, beautiful native alternative to this invasive that I cannot reccomend enough. It’s a hardy plant that produces similarly attractive flowers, which butterflies and other native pollinators also love. It can also be an important larval host to some butterflies and moths.

    Spirea can even be planted as a natural hedgerow. Peter Kenagy has done this to great effect on his farm in North Albany.

  2. Grace Peterson says:

    Yes. And pruning the plant at ground level won’t hurt it at all. In fact, if gardeners cut it down in late winter, it will make the deadheading chore much easier.

  3. Hazel Siebrecht says:

    I find the Scotch Broom which is taking over Oregon to be much more invasive and I’m sure it sends a lot of people into sneezing fits! I’d love to see it destroyed.

  4. J. Jacobson says:

    Perhaps we could build a beautiful wall around Albany. Then, any of the invasive fauna found inside the wall would be hunted down and thoroughly doused with DEET, thereby denying dignity to the Buddleia davidii.


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