Identifying plants with seed pods weed illinois

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Home Yard & Garden Newsletter at the University of Illinois

Vining plants are often desirable in the home landscape. They cleverly disguise carefully placed trellises and their form seems to take on a life of its own. Some vines have been known to cover trees, poles, cars, and even slow moving animals I suspect. Quite a few vines are considered weedy by most. Too often, people will allow an unidentified, cute, little vine to flower. Fast forward a few years, and its population will be out of control. The initial cuteness impression will be long gone and efforts will be underway to eradicate it.

Proper identification is critical to good weed control as is scouting often for emerging weed issues. Need some help identifying those mystery vines? Here is a brief description of some of the more common weedy vines found in lawns and gardens. As with all broadleaf weeds, leaf arrangement, flower type and the presence of underground structures such as rhizomes or tubers all play a key role in identification.

Honeyvine milkweed (Ampelamus albidus) is a perennial vine that spreads by seed and long spreading roots. The leaves are heart-shaped on long petioles and opposite on the stem. Flowers are small, whitish, and borne in clusters. It forms a smooth, green seed pod that is similar to that of common milkweed. Pods persist into winter and can then be spotted easily in the landscape when evergreens are the backdrop. The presence of the pod is a dead giveaway for identifying this weed.

Hedge bindweed (Calystegia sepium) is a perennial vine that spreads by rhizomes. The leaves are alternate on the stem and are distinctly triangular in shape with a pointy tip. The leaf base is cut squarely. The flowers are white to pink, and funnel-shaped like that of morningglory, another vine I will discuss in a bit. Bindweed is often mistaken for morningglory which is an annual weed. Initially, it may not be perceived as much of a problem, although, the rhizomes can help this vine spread quickly.

Field bindweed (Convolvulus arvensis) is similar to hedge bindweed except the leaves are arrowhead shaped with a rounded tip. Also, the leaves are smaller and the leaf bases are rounded with outwardly divergent lobes. I try to keep the two straight by thinking “hedges have edges.” Field bindweed is a rhizomatous perennial as well.

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Wild buckwheat (Polygonum convolvulus) is similar also, but the lobes at the base of the leaf point backwards toward the petiole and it has an ochrea which is the easiest way to differentiate between these species. An ochrea is a papery sheath that encircles the stem where the petiole attaches to the stem. It is indicative of the smartweed family for which it is a member. Also, the flowers are greenish white and inconspicuous. They are clustered on long white racemes. Wild buckwheat is an annual so there are no rhizomes like the bindweeds have. Don’t let this fool you; it is still considered a “serious weed” according to Weeds of the North Central States.

Morningglories (Ipomoea spp.) are often confused with bindweed and wild buckwheat too except the leaf shape is quite different. Depending on the species, leaves are either heart shaped or 3-lobed (ivy like). The cotyledons are butterfly-shaped. Most of the morningglories found in Illinois are summer annuals so reproduction is by seed. Bigroot morningglory or wild sweet potato as it’s also called (I. pandurata) is a perennial found across the state. Both bigroot and tall morningglory have heart shaped leaves like honeyvine milkweed, however, the leaves are alternate on the stem. Bigroot morningglory can be distinguished by its reddish purple centered white flowers and large underground tubers.

Controls for vines include repeated pulling or cutting back, mowing, mulching, and herbicides. In a turf situation, grass should be properly maintained and mowed as high as possible. These vines have a difficult time growing in thick, lush turfgrass. Postemergent herbicides that provide at least some control of these vines include but are not limited to the following: 2,4-D, carfentrazone, quinclorac, dicamba, oxyfluorfen, and triclopyr. Glyphosate may also be used for spot applications as it is a non-selective herbicide. Be sure to carefully read and follow all label directions. Repeated applications may be necessary. Summer annual weeds are most susceptible to treatment in the spring or early summer when they are young. For perennials such as the bindweeds, fall applications may be most effective.

Beauty is in the eye of the beholder, you know. Just today as I snapped a picture of field bindweed in flower, an innocent bystander said that she thought the flowers were so pretty. She’s right. They are pretty–up close. But when I see this vine cover a shrub, I can’t think of it being anything other than a weed.–Michelle Wiesbrook

The mention of trade names in this newsletter is for general information purposes only. It does not constitute an endorsement of one product over another, nor is discrimination intended against any product.

Home Yard & Garden Newsletter at the University of Illinois

Broadleaf Seedlings Recently Seen in Central Illinois

Weeds can be challenging to identify. Tiny seedlings can be even trickier. Often times, letting your mystery seedlings grow a little so that all the parts are easier to see and handle can greatly help your identification efforts. Of course, waiting until your weeds are too tall can result in weeds that are more difficult to control. Therefore, timely identification is essential.

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The following are 10 seedlings that have been prevalent the past few weeks. Of course, the southern part of the state likely saw these already. If that’s the case for you, simply view this as a refresher if you will. For you Northerners, these weeds will be popping up soon if they have not already. I trust they are there already with the warmer days we’ve had.

Prostrate knotweed (Polygonum aviculare) – is a flat growing summer annual that germinates early in the spring. Cotyledons are narrow and grass-like. Plants form a tough, wiry mat. True leaves are rounded and a bluish green. At the base of the leaf, the stems are surrounded by a papery sheath (ocrea). The flowers are small and inconspicuous. This weed is a common lawn species and can invade landscape plantings from lawns. It is often found on compacted soils and paths.

Speedwells (Veronica spp. ) – are low-growing and freely branched. Many types exist. Some of the more common species in Illinois (corn speedwell and purslane speedwell) are winter annuals, but some types are perennial. Flowers occur in the spring; they are small and white, blue, purple, or pink. The seed capsule is generally heart-shaped but can be four-lobed on certain types. Leaf margin and arrangement vary according to type. Speedwells are common in lawns, gardens, roadsides, and fields and can be a particular problem in spring seedings. Shade and moisture are favored by several types.

Corn speedwell seedling.

Purselane speedwell seedling.

Yellow woodsorrel (Oxalis stricta) – is a low, dense, perennial weed that can stand about 12 to 18 inches tall. Spread is primarily by seeds but can also be by rhizomes. The stems are weak, branched at the base, and hairy. The leaves have long petioles and are divided into three heart shaped leaflets. The flowers have five yellow petals. The seed pods are five ridged, pointed, and about 1 inch long.

Yellow woodsorrel seedling.

Dandelion (Taraxacum officinale) – is a perennial weed that reproduces mainly by seeds but also by broken taproot segments. The leaves are borne in a rosette around the stem and are simple, 3 to 10 inches long, and deeply lobed (teeth point toward the leaf base). Seedlings can easily be confused with similar growing rosette forming species such as shepherd’s-purse. Leaves, flower stalks, and taproot exude a milky juice when cut. The flower heads are 1 to 2 inches wide and bright yellow.

Broadleaf plantain (Plantago major) –is a rosette forming cool-season perennial that reproduces by seed. The leaves are dark green, broad-oval, with prominent parallel veins. The flowers are small; borne in dense clusters at the upper ends of 8 to 20 inch tall leafless flowering stalks that appear like fingers or rat-tails.

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Broadleaf plantain seedling.

Violets (Viola spp.) – are a low growing cool-season annual or perennial spreading by seed and creeping rhizomes. The leaves are kidney-shaped to broadly oval with heart-shaped bases; 2-4 in. wide, often cupped, with margins that are toothed. The flowers appear early in spring and are pansy-like, white to blue to purple, and sometimes yellow. Violets prefer moist, shady, fertile sites.

White clover (Trifolium repens) – is a cool-season perennial spreading primarily by seeds but also by creeping stolons that can root at the nodes and form patches. The leaves are comprised of 3 unstalked oval leaflets on one long petiole; leaflets are dark green, often with faint, white, crescent-shaped markings. Flower heads are ballshaped, white to pink, up to 1¼ inches across.

White clover seedling.

Henbit (Lamium amplexicaule) – is a winter annual weed that appears in late fall and very early in the spring. The leaves are opposite, with rounded teeth to deeply lobed on the upper leaves, and only the lower leaves have petioles. The stems are square, green to purple, erect but branching at the base. Pinkish-to-purple flowers are borne in the axils of the upper leaves. It is found in gardens, lawns, and cultivated fields.

Ground Ivy (Creeping Charlie) (Glechoma hederaceae) – is a perennial member of the mint family that reproduces by seeds and root pieces. It may form patches as it creeps on square stems that can grow up to 2-1/2 feet long, sometimes rooting at the nodes. Occasionally, the stems grow in an ascending fashion. Leaves of ground ivy are opposite, round to kidney-shaped, and 1/2 to 1-1/2 inches in diameter. They may be smooth or hairy, medium to dark green, and have long petioles and a rounded, toothed margin. They produce a minty odor when crushed. The flowers are small, lavender to blue-purple, funnel-shaped, and clustered in leaf axils. Ground ivy flowers occur from April to June. This weed normally occurs in shaded sites with poorly drained, fertile soils. It can spread into sunny areas.

Ground ivy seedlings.

Common chickweed (Stellaria media) is a winter annual with a shallow, fibrous root system. It grows 4 to 12 inches tall. The leaves are light green, opposite, and often teardrop shaped. The flowers are small and white and have five deeply notched petals. It is common in lawns, gardens, and landscape plantings.

For assistance in identifying weeds, please consult with your local University of Illinois Extension office. You may also submit plant samples to our Plant Clinic located in Urbana. Please see http://web.extension.illinois.edu/plantclinic/ for more information. (Michelle Wiesbrook)

The mention of trade names in this newsletter is for general information purposes only. It does not constitute an endorsement of one product over another, nor is discrimination intended against any product.