Non-Native Hawkweed Species

Hieracium spp.

Non-Native Hawkweed Species

Family: Asteraceae

Weed class: noClass
Year Listed: 2002
Is this Weed Toxic?:

not known to be

Why Is It a Noxious Weed?

Hawkweeds are prolific seed producers, weedy and capable of hybridizing with many exotic and possibly native species. Hawkweeds are aggressive competitors of pasture, range and native plant species.

How would I identify it?

General Description

Hawkweed species are perennial herbaceous plants that have flowerheads of ray (ligulate) flowers and have a milky latex in their stems. Most non-native hawkweed species have yellow flowers.

May Be Confused With

This listing excludes native hawkweed species: houndstongue hawkweed (Hieracium cynoglossoides), long-beaked hawkweed (Hieracium longiberbe), narrow-leaved hawkweed (Hieracium umbellatum), slender hawkweed (Hieracium gracile), western hawkweed (Hieracium albertinum), white-flowered hawkweed (Hieracium albiflorum) and woollyweed (Hieracium scouleri).

Where does it grow?

Please click here to see a county level distribution map of all other hawkweed species in Washington.

How Does it Reproduce?

Plants can spread by seed as well as by stolons and rhziomes. Modes of spread may differ between species.

For More Information

Pierce County NWCB Fact Sheet on Hawkweed Spp.

Control Options for Hawkweed Spp. from King County NWCB

Additional Photos