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FutureStarrSpotted Jewelweed or
Impatiens capensis was transported in the 19th and 20th centuries to England, France, the Netherlands, Poland, Sweden, Finland, and potentially other areas of northern and central Europe. These naturalized populations persist in the absence of any common cultivation by people. This jewelweed species is quite similar to Impatiens noli-tangere, an Impatiens species native to Europe and Asia, as well as the other North American Impatiens. No evidence exists of natural hybrids, although the habitats occupied by the two species are very similar.
There is limited information available on control methods for spotted jewelweed. Control methods used for policeman’s helmet, Impatiens glandulifera, a Class B noxious weed in Washington, can be adapted for use on spotted jewelweed. Plants may have some seeds that remain in the seedbank after the first year so it is important to manage and monitor sites and provide additional control when necessary. Removing invasive species can open up a habitat to re-invasion if follow up management does not occur. By planting a variety of desirable species, a community will be present to help provide competition and shade weed seedlings and to also provide a food source for pollinators. When possible, carry out control methods when pollinators are not active on plants. Also, make sure to clean shoes, clothing, and equipment when leaving infested areas to prevent spreading seed to new locations. Spotted jewelweed has a shallow root system and can easily be hand-pulled when growing in damp soils.
Make sure to remove the roots, especially in drier soils where plants may break off. If the plants do not have seed capsules, they can be crushed and left on site in a dry place to compost (King County Noxious Weed Control Program 2016--see link below). If plants have seed capsules, make sure to bag and put them in the trash (King County Noxious Weed Control Program 2016). It is important to properly identify spotted jewelweed plants before removal to avoid accidentally removing native Impatiens species. Plants will need to be identified while in bloom and care needs to be taken as native Impatiens may grow among spotted jewelweed plants.Jewelweed, Impatiens capensis, is an annual plant in the balsam family (Balsaminaceae) native to northern and eastern North America that also goes by other common names including orange balsam, orange jewelweed, spotted jewelweed, and spotted touch-me-not. The species name capensis, meaning “of the cape”, was applied because its origin was mistakenly thought to be from South Africa. It is common and widespread in moist, shady areas such as low woodlands, margins of bogs and marshes, along streams and lakes, in ditches, and in disturbed areas such as road cuts. (Source: hort.extension.wisc.edu)