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oregon weeds seed head

Purslane is an annual, succulent-like weed that reproduces by tiny black seeds and stem fragments. This weed appears in late spring or early summer and likes warm weather, fertile soil and moist garden beds.

An approved herbicide, applied for two years in an established in a thistle-infested area, is an effective control. Usually, a combination of techniques is needed. Consult with your cooperative extension office for an approved herbicide and suggested program.

5. Buckhorn Plantain (Plantago lanceolata)

Common lambsquarters is a summer annual broadleaf weed that is widely distributed across the northern half of the United States and southern Canada. Thanks to its widespread distribution, it’s no surprise that lambsquarters is often a problem in gardens with sugar beets, vegetable crops, and pulse crops such as dry edible beans, lentils, and chickpeas.

Is Pigweed Edible?

If Canada thistle becomes rooted, the best control is to stress the plant and force it to use stored root nutrients. It’s at its weakest during the flowering stage in summertime; this is a good time to begin cultivation and destroy the roots and rootstock. One season of cultivation followed by a season of growing competitive crops such as winter rye, will go a long way toward eradication.

Blooms: summer


Learn more:

Blooms: mid-summer

Here are five of the most invasive Central Oregon weeds to get you started:

Remember, if you are pulling spotted knapweed after it has flowered, to be sure to bag your weeds.

Mullein ( Verbascum thapsus):
This invasive weed begins as a rosette then can grow more than 6 feet tall. Mullein can quickly overtake and displace native species, releasing over 100,000 seeds from each parent plant. Mullein has soft, fuzzy leaves in a rosette during their first year and blooms into tall yellow heads in their second year.

What are invasive weeds?
Invasive weeds are plants that grow, spread aggressively, and will out-compete and cause harm to native vegetation, destroy natural animal habitat, and compete for scarce water resources. Use this weed guide to help identify our area’s worst weeds. Then, join us in preventing, controlling, and reducing invasives as you care for your own piece of Central Oregon.