- Common name: Pitted morningglory, tall morningglory, ivyleaf morningglory
- Scientific name: Ipomoea lacunosa, Ipomoea purpurea, Ipomoea hederacea
- Grass or broadleaf: Summer annual broadleaf
- Native to the United States, and widespread across the country
- Except for the palm leaf morningglory, the first two morningglory leaves that emerge are butterfly-shaped.
- Morningglory species can be identified by leaf shape, leaf hairs and flower color. Tall morningglory and ivyleaf morningglory produce purple or bluish-purple flowers, while pitted morningglory produces smaller, white flowers.
- The weed produces large, hard seeds with an impermeable seed coat, making it tough to control.
- Although there are no confirmed cases of herbicide resistance in morningglories, a tolerance to glyphosate has been documented.1
- A single tall morningglory plant per row foot can potentially cut soybean yield in half.1
- Depending on the species, each morningglory plant can produce as many as 15,000 seeds.1
- According to the Southern Weed Science Society, morningglories have been listed among the most common and most troublesome weeds for soybean growers in the organization’s weed surveys dating back to 1973.2
A fact that may surprise you …
- Despite being considered a troublesome weed by farmers, morningglories are prized by gardeners for their colorful, trumpet-shaped flowers.
Morningglory control/management tips
Applying herbicides before planting and/or preemergence can provide good-to-excellent control of the morningglory species often found in crop fields. Postemergence herbicide applications are also recommended to control heavy infestations. In addition, planting in a narrow-row system to close the canopy more quickly can inhibit weed growth by decreasing sunlight available to the germinating morningglory plant.
“In corn, morningglory often germinates after the crop reaches 12 inches tall,” says Andy Asbury, Enlist™ field specialist. “Atrazine, though effective, can’t be applied to corn after it reaches this height.” ™
Asbury notes growers can apply Enlist herbicides later in the growing season, up to the V8 growth stage or 30 inches, allowing control of more germinated morningglories.
“Morningglory in soybeans are often hidden by the crop canopy,” Asbury says. “The Enlist weed control system allows application of Enlist herbicides in soybeans through the R2 growth stage. The 2,4-D choline in both Enlist Duo and Enlist One herbicides is very effective in controlling vines such as morningglory.”
Corteva Agriscience™, Agriculture Division of DowDuPont™, weed control solutions:
SureStart® II herbicide
Keystone® NXT herbicide
Keystone® LA NXT herbicide
FulTime® NXT herbicide
Surpass® NXT herbicide
Durango® DMA® herbicide
Enlist Duo® herbicide, as part of the Enlist™ weed control system
Enlist One™ herbicide, as part of the Enlist weed control system