Weed Watch
Knotweed. Photo by Stan Shebs [CC BY-SA 3.0], from Wikimedia Commons

Prostrate Knotweed
Polygonum aviculare

Knotweed is a prostrate summer annual that germinates in early spring and is commonly found in pathways, sports fields and other compacted areas in turfgrass. This weed grows flat along the soil surface and forms circular mats with narrow, linear cotyledons, which are often mistaken for grass. It is typically recognized by its tough, wiry stems that are highly branched and circular mats. Knotweed also has small, inconspicuous white to pinkish flowers that grow in the areas between stems and leaves.

Prior to germination in the early spring, apply a preemergence herbicide containing isoxaben, such as Gallery® specialty herbicide. Another way to get ahead of it, is to apply Dimension® specialty herbicide in the late fall to control the early germinating knotweed for upcoming spring. To maximize control, maintain a dense, healthy turf that will compete well with knotweed by proper use of fertilizers, having an appropriate mowing height, uniform watering and compacted soil aerification.

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Keeping it simple

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Ground Ivy video
Photo: Dow AgroSciences

Is ground ivy the cause of your callbacks this summer?

This prostrate creeping perennial weed has square stems several feet long that root at the nodes. Ground ivy prefers moist, shady sites and tolerates low mowing heights. Known for its rounded, scalloped leaves and small funnel-shaped purple flowers, ground ivy can be tough to control. Check out this video for helpful identification tips and simple ways to control this grassy weed now and into the summer.
Watch the video.

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®™Trademarks of Dow AgroSciences, DuPont or Pioneer and their affiliated companies or respective owners. Arylex active is a registered active ingredient. Relzar has not yet received regulatory approvals; approvals are pending. The information presented here is not an offer for sale. State restrictions on the sale and use of Dimension apply. Consult the label before purchase or use for full details. Always read and follow label directions.
©2018 Dow AgroSciences LLC

This issue of Weed Watch was produced by North Coast Media's content marketing staff in collaboration with Dow AgroSciences. The series features key weeds, along with identification tips, control tips and product recommendations.

Photos: Ground Ivy video and Power of More logo by Dow AgroSciences; Knotweed photo by Stan Shebs [CC BY-SA 3.0], from Wikimedia Commons