Prevention/Treatment: Growing a thick, healthy lawn is the first line of defense against these mint cousins, since the grass will easily outcompete the weeds for nutrients and growing space. One or two deadnettle weeds popping up in the lawn can easily be plucked by hand and disposed of as soon as they appear, but a larger population requires a more complicated solution.
Prevention/Treatment: To prevent this weed in a residential lawn, cultural practices to develop a dense, aggressive turf may help to hinder its invasive qualities. This includes proper mowing and watering,
Time of year: During April and May, populations of hairy bittercress become increasingly visible. This weed prefers a cool, moist soil and is most prolific after early spring rains.
Time of year: Deadnettle is a winter annual weed that primarily emerges in the fall. But the flowering and seed set beginning in early spring. Plants die with hot, dry weather in late-May and June.
Prevention/Treatment: Encouraging good grass growth is important to preventing hairy bittercress invasions. Pulling out hairy bittercress can often leave the roots behind and is usually most effective with young plants. It’s best to use a weeding tool to dig down and around the taproot to get all the plant material out of the ground. Post-emergent weed control is the most effective and long-term solution.
Damage: Poa annua grass is typically a problem in the lawn because it dies back in hot weather, which can make unsightly brown spots in the lawn during the height of summer. It also thrives during cool weather, when most lawn grasses are dying back, which means that it invades the lawn at these susceptible times.
Time of year: The seeds of henbit sprout in the fall or early winter. When temperatures start to warm in the spring, henbit will grow vigorously and become noticeable in the lawn. In mid-spring, the flowers form. The henbit then produces seeds and dies as the temperatures start to get hot in early summer.
Mouse-ear chickweed, hairy bittercress, henbit, deadnettle and poa Annua are common annual winter weeds that may invade your dormant lawn this fall and winter. Learn more about each of these winter weeds below and take control of your lawn before they do.
Remember that a healthy, dense lawn is the best method for preventing winter weeds. Proper mowing height, appropriate watering and professional fertilization are the best defenses against these weeds. Having your lawn treated during the fall can prevent all of these winter annual weeds from showing up in the first place in warm season lawns. In Fescue lawns we focus on the broadleaf winter annuals with our first two applications of the year.
Since annual bluegrass is in the grass family, broadleaf weed control products will not be effective. The product that is usually applied to control annual bluegrass is a pre-emergent weed control product.
Even though these lawns may be dormant, many weeds are just starting to become active in the fall. These weeds are known as winter weeds. They can be annual, biennial or perennial in regards to life cycles, and these winter weeds can be very difficult to control.
The ones that are most troublesome are the winter broadleaf annual weeds, which include common chickweed, henbit, lawn burweed, large hop clover knawel and parsley-piert.
Winter weeds are probably the most annoying;, they are an annual bluegrass also known as poa annua . This annual weed has two periods of germination. The first period is in the late summer, usually in early September. The second is in late winter/early spring, usually late February to mid-March.
The Different Types of Winter Weeds
Winter annuals germinate in the fall, grow during the winter, and then develop flowers and set seeds in the spring and finally die when the weather turns hot during the summer. The seeds they leave behind will germinate in the following fall.
Pre-emergent weed control inhibits the formation of a new plant from the seed the plant leaves behind. Annual bluegrass is a prolific seed producer. The same pre-emergent weed control product that is applied to control crabgrass will also control annual bluegrass.
While the northern parts of the US are in the process of hunkering down for the winter, the milder temperatures of the southern states are providing the ideal temperatures to control many troublesome weeds in what soon will be dormant lawns.
What Are Some Common Winter Weed Control Methods?
Most of these weeds can be treated with broadleaf weed control products, which are available at hardware stores, garden centers and home improvement centers. Lawn care companies like Spring-Green also offer programs that are designed to keep these weeds from becoming a major nuisance in your lawn. In many cases, these weeds distract from the uniform appearance of the lawn and will often overtake the desired grasses.
Taking care of weeds during the winter on warm season turfgrasses will help to assure that the lawn will be more attractive in the spring. The best weed control method of all is a thick, well-fertilized lawn that is mowed high and receives adequate moisture during the growing season. However, you may find it easier to contact your local lawn care provider , such as Spring-Green, to help you care for your lawn.