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weed with large seed pods

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.

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

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

1. Top priority: eradicate before seeds disperse

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.

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Test Garden Tip: This weed is native to areas of North America. Unlike many exotic weeds, it does support local wildlife.

Appearance: This garden weed has light green leaves that look a little like clover and cup-shape yellow flowers in summer and fall.

Control: Mulch your garden to prevent it in landscape areas. Use a postemergence herbicide in lawns in spring or fall, or dig the weed out by hand.

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Type: Broadleaf perennial

Control: Mulch the garden to prevent weeds or use a preemergence herbicide in spring. Pull weeds by hand or spot-treat with a nonselective postemergence herbicide.

Type: Grass-like perennial

Size: To 6 inches tall and 2 feet wide