Figure 1
Map of the northern Olympic Peninsula in Washington State with the project area, the Dungeness Valley, outlined in red. The Dungeness Valley is the location of carrot seed production in Clallam County, and the area targeted for management of wild carrot. Map created by the authors.
Figure 2
A field in the Dungeness Valley, Clallam County, Washington inundated with wild carrot. Prevention, eradication, or even widespread control of the weed are not feasible options under these conditions. Photo by the authors.
Table 1
Summary of control method observations.
| Method | Observation |
|---|---|
| Hand-removal of seed heads | Plants sprouted new seed heads within the same growing season. No reduction in numbers in Year 2. Presence of new seedlings. |
| Clipping at base height to simulate mowing | Plants spread horizontally and formed new seed heads within the same growing season. No reduction in numbers the following year. More blooms present in Year 2. Presence of new seedlings. |
| Hand-digging plant to 2 inches below surface | Reduction in numbers in Year 2. Some re-growth, and presence of new seedlings. |
| Hand-digging to remove entire plant | Most effective in reduction of numbers of existing plants. |
Figure 3
This poster is an example of the educational materials created by the WSU Extension office as part of the outreach campaign conducted by Master Gardeners to raise awareness about the problem of wild carrot in the Dungeness Valley. Image created by the authors.