Canada thistle, a noxious weed common in Colorado, is an aggressive and creeping perennial that spreads from its root system. Shoots become 1 to 3 feet tall and its purple flowers are about the size of a dime. It can also be recognized by its spiny leaves and stems. Hand pulling Canada thistle isn't an […]

Field bindweed (Convolvulus arvensis) is a common problem in Colorado lawns in summer. Bindweed and other weeds don't compete well in a dense, healthy, well cared-for lawn. This deeply-rooted perennial member of the morning glory family will quickly take over unhealthy, malnourished lawns suffering from drought stress or poor irrigation coverage. The first steps towards […]

Field bindweed is a noxious perennial weed that is difficult to kill because of it's extensive root system. It has distinctive arrowhead-shaped leaves and white or pink flowers. Bindweed grows along the ground until it encounters an object that it can climb, such as fences or other plants. Hand-pulling well-established bindweed generally does not kill […]

Pre-emergent herbicides or "weed preventers" are often used to control annual lawn weeds such as crabgrass, foxtails, barnyardgrass, spurge, knotweed, purslane and others. Examples include various "crabgrass preventers" on the market. A pre-emergent herbicide does not prevent weed seed germination or kill the seed. Instead, the root system development of a young weed seedling is […]

Invasive ornamental weeds, because they are so much more attractive than some of the other noxious weeds, are less likely to be seen as problematic plants. "But they are so pretty," people cry. Perhaps, but these pretty plants are just as destructive to native ecosystems as their uglier friends There are at least fifteen plants […]

Landscape weed control requires a three-pronged approach: prevention, cultural and chemical control. Weeds are opportunists. If there is an area in the yard with little or no vegetation, or if the vegetation is highly stressed, weeds will flourish. Their adaptability to difficult growing conditions is what makes us call them a weed.   Prevent weeds […]