Originally planted as a garden ornamental, Japanese barberry can quickly escape cultivation and invade Wisconsin’s woodlands. / Photo Credit: Wisconsin DNR

By Wisconsin DNR

As winter begins to loosen its grip on Wisconsin, many gardeners have turned their thoughts to that unmistakable harbinger of spring: Planting season.

While dreaming of spring blooms and designing your next garden or landscape layout, consider that invasive plants may try to weed their way into your plans.

Many invasive plants that are problematic for Wisconsin forests gained their foothold in the state as garden ornamentals. Although Wisconsin regulates 145 plants under the invasive species rule NR 40 prohibiting their sale, it’s essential to check your selections before purchasing and choose native plants whenever possible.

Wildflower seed mixes can be especially problematic in hiding invasive plants. Seeds for invasive plant species may be mixed with native wildflower seeds in packs, so carefully read the label before buying. There are other nonnative plants available that do not pose the threat of becoming invasive.

If you aren’t sure whether a plant is invasive, try web-searching the name along with “invasive” and “Wisconsin” to verify.

Why is the control of invasive plants so important?

Invasive plants can quickly spread, crowding out other plants and creating a monoculture (an area dominated by a single plant). This effect reduces biodiversity, increases fire risk and negatively affects wildlife habitat. Native plants have adapted to the local climate and soil and will attract beneficial insects and pollinators.

A list of Wisconsin native plant nurseries is available to help you find your closest option for native plants and seeds.

The Midwest Invasive Plant Network offers a detailed brochure for gardeners and landscapers with a list of invasive plants to avoid, including suitable alternatives for those invasives. They have also created a free mobile app that is available for download.