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The CSU Extension in Gilpin County helps mountain residents improve their quality of life by offering a website, classes and programs that provide unbiased, research-based information on forestry, wildfire, wildlife, mountain gardening, noxious weeds and many other issues. Through our 4-H programs, we help youth develop life skills through leadership opportunities.

Yellow Toadflax   arrow

Yellow toadflax (Linaria vulgaris)

State law: Toadflax must be eradicated or contained in Gilpin County.

Caution: there is a native plant, Golden Banner (Thermopsis divaricarpa) which people sometimes confuse with toadflax. If you look at the leaves, it is impossible to mistake them.

The leaves of yellow toadflax are linear. The leaves of Golden Banner have three leaflets (like a clover).

Golden banner Golden banner (good/native) has leaflets like a clover
Yellow toadflax (Linaria vulgaris) Yellow toadflax (bad/noxious)has linear leaves

Additional information on yellow toadflax:

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