Priority: - Contain
Tags: Agricultural | Terrestrial
Identification and Reproduction
- Orange hawkweed is an invasive flowering perennial in the Asteraceae (daisy) family.
- Single erect stem can grow upto one metre tall and is covered in hairs but leafless.
- It has very hairy leaves that form in a central basal rosette.
- Flowers are orange and dandelion-like.
- Spreads by seeds that are easily dispersed by wind
- Vegetatively grow through stolons (above ground) and rhizomes (below ground).
Habitat & Ecology
- Orange hawkweed prefers well-drained, coarse-textured soils.
- It will invade open and disturbed areas like pastures and roadsides as well as wetlands.
- Similar to yellow hawkweed, it is known to hybridize with native species.
- Displaces crop yields in agriculture.
- Reduces forage availablilty for livestock
- Since orange hawkweed can establish quickly on deforested sites it can impact reforestation measures.
- It outcompetes other native plants, reducing forage and biodiversity.
- Forms monocultures.
- Has allelopathic properties that prevents growth of other plants.
- Prior to flowering digging may be effective. Ensure that entire roots are removed.
- Small infestations can be hand pulled. Be sure to collect all stolon and root fragments to prevent regrowth.
Currently a stolon-feeding wasp and a root-feeding hover fly are being researced in BC.
- Picloram, aminopyralid, 2,4-D are effective on orange hawkweed.
- Another consideration is to fertilize surrounding native vegetation in the spring. This will help facilitate growth to help outcompete with the invader.
- Please carefully read and follow herbicide labels prior to application.
For alternative planting options to orange hawkweed download the ISCBC's Grow Me Instead brochure (pg. 39 and 40).
Download A Guide to Weeds in British Columbia for Orange Hawkweed here.
Header photo (Sapin88).