University of Maryland Extension

weed

Poison Ivy

Poison ivy growing up tree
Have you seen this? Identify Poison Ivy! This is poison ivy (Toxicodendron radicans) . It can grow as a vine, but it also can appear in a leafy or shrubby form in woodlands, fields, and home landscapes. Its appearance can vary depending on the age of the plant and the conditions in which it's...

Weed of the Week - Herbicide Drift

In an attempt to deal with many landscape and turf weed problems, professionals use a wide variety of products. Professionals are always concerned about drift and many modifications have been made over the years to help decrease drift potential. Good applicators look at wind speed, nozzle type,...

Weed of the Week - Lesser Seeded Bittercress

Lesser-Seeded Bittercress, Cardamine oligosperma , seems to be abundant in the landscape currently. This is a newer weed in this area, and can be found in turf, landscape, in ground nursery and also container nursery production. Very similar to Hairy Bittercress, it is typically a summer annual,...

Weed of the Week - Lesser Celandine

Welcome back to our world of weeds. The undesired plants are already getting a good foothold for the new growing season. Lesser Celandine, Ranunculus ficaria L ., also known as Fig Buttercup and pilewort, is a perennial flowering herbaceous plant that is in the process of flowering currently in...

Weed of the Week - Broadleaf Dock

Warm weather has certainly settled upon us this week. I observed a landscape management crew out working in the beds preparing them for the war on weeds and was pleased to see that the mulch had been pulled back and that the pre-emergent herbicide was being applied below the mulch. This will...

Weed of the Week - Blue Mustard

Blue Mustard
800x600 Blue Mustard, Chorispora tenella, is becoming a concern in some nursery settings. Not native to this area, it may arrive with nursery liners. It is a fall germinating winter annual, and a prolific seed producer. A native of the Soviet/Asian continent, it entered this country in the late...

Weed of the Week - Crabgrass

Crabgrass
Crabgrass has been found germinating this Spring; Mark Schlossberg has found it in the Baltimore area. Understanding Crabgrass control is an important part of Spring weed control. Much effort is spent each year to control this Spring germinating weed, and in some cases the efforts do not yield the...
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