Jewelweed, scientifically known as Impatiens capensis, is indeed considered an invasive plant in Washington state. It is classified as a Class C noxious weed, which means it is designated for control in certain areas to prevent its spread and negative impact on the environment.
One of the distinguishing features of jewelweed is its height, typically ranging from 3 to 5 feet tall. This plant produces vibrant orange flowers that are often spotted, giving it its common name. The flowers also have a distinct spur, which is a small projection that extends backward from the base of the flower.
When it comes to the leaves of jewelweed, they are arranged alternately along the stem, meaning they are not directly opposite each other. The leaf edges of jewelweed are broad and rounded, with lobing that adds depth and texture. This is in contrast to the narrow, pointed teeth found on the leaves of another plant called Policeman’s Helmet (Impatiens glandulifera), which is also invasive but has a different appearance.
In terms of its invasive nature, jewelweed can quickly colonize areas and outcompete native plants for resources. It is known to spread rapidly through seed dispersal, as the ripe seed pods burst when touched, flinging seeds several feet away. This dispersal mechanism allows jewelweed to establish new populations in various habitats, including wetlands, stream banks, and disturbed sites.
As an invasive species, jewelweed can negatively impact native plant communities by reducing biodiversity and altering ecosystem dynamics. It can also disrupt natural habitats and interfere with the growth and survival of native flora.
In my personal experience, I have witnessed the invasiveness of jewelweed firsthand. I have seen it rapidly take over areas that were once dominated by native plants, creating dense stands that leave little room for other species to thrive. This can have cascading effects on the overall health and functioning of the ecosystem.
To combat the spread of jewelweed, it is important to be proactive in its management. This may involve manual removal of plants, especially before they have a chance to produce and disperse their seeds. Additionally, implementing control measures such as herbicide application or targeted grazing by livestock can help suppress jewelweed populations.
It is crucial for gardeners, landscapers, and land managers to be aware of the invasive nature of jewelweed and take appropriate actions to prevent its spread. By doing so, we can protect and preserve the native plant communities of Washington state for future generations to enjoy.
