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weed with yellow flower and seeds have spikes

First up, weeds already going to seed or getting close. Catch them now before seeds disperse!

Many garlic mustard plants in King County are going to seed. Note the long, skinny seed pods on this one.

If you’ve made it outside on a recent sunny day, you’ve probably noticed the abundance of flowers blooming in gardens, parks, forests, and throughout King County right now. Unfortunately, the noxious weeds are out there, too—many of them bolting, flowering, and even going to seed already.

1. Top priority: eradicate before seeds disperse

Below are some of the top regulated noxious weeds to keep an eye out for this month. Please let us know if you see one of these high-priority invasive plants, so we can make sure they’re controlled or eradicated in time! [Click here to go to the King County Noxious Weed List for the whole list!] Report locations and share photos with us easily on our new and improved Report a Weed online form.

Garlic mustard (Alliaria petiolata), a Class A noxious weed, is a biennial or winter annual herb, can self-pollinate to produce 62,000 seeds and overtake a relatively undisturbed forest understory. Eradicating it before seeds mature is key. You can identify garlic mustard by:

You can also check out our other blog posts on the plant.

For more information on garden loosestrife identification and control, visit these pages:

Parrotfeather (Myriophyllum aquaticum) forms mats up to a foot above the water’s surface, looking like a miniature forest of pine trees.

A number of our riparian and aquatic weeds are also flowering and seeding right now. For instance, the resilient garden loosestrife (Lysimachia vulgaris), a Class B noxious weed, is currently blooming along King County’s shores. You can identify garden loosestrife by:

Spotted knapweed (Centaurea stoebe) in bloom. Photo by Matt Lavin / CC BY.

For more information on Canada thistle identification and control, visit this page:

Garden loosestrife (Lysimachia vulgaris) infestation at Marymoor Park on Lake Sammamish.