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Common Weeds & Lawn Diseases

Adam’s Weed and Lawn Disease Information Library is your home for information about the most common weeds and lawn problems in Minnesota and Western Wisconsin, their biology, behavior, and of course, how to control them.

Image of Common Chickweed

Common Chickweed

Common Chickweed is a winter annual plant producing smooth stems and leaves that typically sprawl throughout turf, landscape, and vegetable gardens forming dense patches. The stems of Common Chickweed are…

Common lawn weeds, crabgrass


Crabgrass (digitaria) is in the grass family and is an annual grassy weed that can spread rapidly and will suppress the growth of other plants. With the capacity to spread…

lawn weeds, foxtail


Foxtail (Setaria) is an annual that grows quickly during the warmth of summer. A foxtail is a spikelet or cluster of grass that disperses its seeds as a unit, meaning…

Weeds of Minnesota, Creeping Charlie

Creeping Charlie

Creeping Charlie (ground ivy) is an invasive, aromatic, evergreen creeper. It is a perennial of the mint (Lamiaceae) family and thrives in moist, shady areas, but it will also tolerate…

five dandelions before lawn treatment


Dandelion (Taraxacum officinale) is a common perennial from the Asteraceae family or Sunflower family. Dandelions grow freely especially in areas that are moist with full sun.

Adam's Healthy Lawn Knotweed


Japanese Knotweed is an herbaceous perennial that can be more readily seen during mid-summer and early autumn. This shrub-like plant develops large, dense clumps that are between 3’ – 9’…

Common lawn weed, spurge

Leafy Spurge

Leafy Spurge is a perennial standing 2-3 ½’tall with smooth stems branching out from a deep vertical root. When stems, flowers, and leaves are broken, a milky-white sap is released.…

Common lawn weeds and diseases, tall fescue

Tall Fescue

Tall Fescue grows in clumps, is coarse-textured with wide blades, and can reach up to 6 ½’ high. Tall fescue is often misidentified as crabgrass, but they are very different…

Yellow Nutsedge

Yellow Nutsedge can be found wild, as a weed, or as a crop. It is an invasive species and is often found in wet soils such as rice paddies and…

Thistle. A common lawn weed.


Thistle is the name used for a group of plants characterized by sharp prickles all over the plant including the stem and the flat parts of the leaves. Most thistles…

Common lawn weeds, violet

Wild Violet

The Common Blue Violet (Viola sororia) is an annual or short-lived perennial that grows up to 6” wide and 4” high. The flowers are a bit taller than the leaves…

Lawn weeds, white clover

White Clover

White Clover (Trifolium repens) is a long-lived perennial legume or winter annual legume. White Clover is a popular choice for systems that are “living mulch” and are planted between rows of…

Lawn weeds and diseases, fairy ring

Fairy Rings

Fairy rings can be caused by any number of fungi.

Lawn weeds and diseases, leaf spot

Leaf Spot and Melting Out

Leaf spot and melting out are different diseases with similar symptoms, caused by different fungi. Melting out (caused by Bipolaris sorokiniana) usually appears in April and May during cold, rainy…

Necrotic Ring Spot

Necrotic ring spot (Leptosphaeria korrae) is caused by a parasitic form of plant life called fungi. Fungi live in the soil, thatch and dead leaves. Necrotic ring spot spreads throughout…

Common Lawn Diseases Powdery Mildew

Powdery Mildew

Powdery mildew is a common fungal disease most often found in shady areas of the lawn. Powdery mildew can occur throughout the growing season but is usually most noticeable in…

adam's healthy lawn snow mold

Snow Mold

Snow mold, also known as snow rot, is a common problem in areas with late snow covers and cold, damp springs. Snow mold flourishes under snow or wet leaves during…

dead spot in lawn

Turf Patch

Common turf patch diseases include Yellow Patch (Rhizoctonia cerealis) and Summer Patch (Magnaporthe poae), as well as Necrotic ring spot. (See Necrotic ring spot)These diseases are caused by fungus that…

Not Sure What Weed or Lawn Disease is Bugging You?

Ask our lawn expert. Email us a photo and/or description, and we’ll identify your weed or lawn disease. Our lawn expert will tell you how Adam’s can eliminate it from your home or property.