Japanese Hedge Parsley
Herbaceous biennial in the carrot family, with white umbel flowers and pasley-like leaves. Flowering plants are branched and grow 2-6 feet tall.
Leaves: First-year plants have low-growing, parsley-like rosettes that stay green until late fall. Second-year plant leaves are alternate, compound, fern-like, 2-5 inches long and slightly hairy.
Flowers: Flowers are tiny and white, growing in small, open, flat-topped umbels. Has 2 or more bracts at the base of each umbel. Blooms in July and August.
Fruits & seeds: The small fruit, ripens quickly, and is covered in hooked hairs that attach to clothing and fur.
There are many white-flowered, umbel-producing plants with pinnately compound leaves, several of which are also weedy exotics. Queen Anne's lace or wild carrot (Daucus carota) - a widespread weed in Wisconsin -- has similar finely-divided leaves, but leaves and stems are quite hairy. It also has larger flat-topped flower umbels, with densely packed white flowers. When crushed, it smells like carrots. Other weedy exotic look-alikes for Japanese hedge parsley include wild chervil (Anthriscus sylvestris), caraway (Carum carvi), poison hemlock (Conium maculatum), Chinese hemlock parsley (Conioselinum chinense), and sweet cicely (Osmorhiza).
HABITS & HABITAT
In Wisconsin, Japanese hedge-parsley has been found in numerous counties. Habitat includes disturbed upland sites such as roadsides, urban areas, railroad rights-of-way and woodlands.
Mechanical: Pull or mow prior to flowering.
Chemical: Treat foliage with glyphosate, triclopyr, or metsulfron methyl in early spring or on plants that are resprouting after having been cut.