ANNIE SCHLECHTER
24.07.2023 - 11:59 / hgic.clemson.edu
Rustweed or juniper leaf is a native plant that earns its name from orange coloring in the fall. It is a drought-tolerant summer annual or short-lived perennial plant. It is found throughout the southeastern United States on mostly open, disturbed sites. Rustweed is considered a ruderal species, meaning that it colonizes open ground and does not handle competition well. Research has shown that rustweed seeds can remain viable in the soil for over one hundred years, just waiting for optimal conditions.
Rustweed flowers have adapted to produce seeds without the need for cross-pollination. The seed produced is tiny and easily spread by lawn equipment. So, if this weed is a problem in your landscape, be sure to clean your lawn mower. The plant has narrow leaves and can be difficult to control with herbicides. Usually, multiple applications are required. This low, spreading plant is unaffected by mowing. The plant develops from a single taproot, so physical removal is usually the best option.
The best strategy to prevent this weed in the landscape is to use a 3-inch layer of medium to coarse bark mulch to prevent seed germination. For more information on different types of mulch, see HGIC 1604, Mulch.
ANNIE SCHLECHTER
Tomato plants are a staple in many gardens, but did you know that there are weeds out there that can easily be mistaken for them? From horse nettle to black nightshade, check out these Weeds that Look like Tomato Plants.
My Rhododendrons were in full bloom when a late frost caught them quite badly. Winter has been wet and mild but if the USA is anything to go by hard frosts may still be on the way so look after your early flowering Rhododendrons.
No other plant native to South Carolina has such fragrant and beautiful spring blooms and stunning fall color as the witch-alders. Fothergilla was named after Dr. John Fothergill, an English physician and gardener who funded the travels of John Bartram through the Carolinas in the 1700’s. These beautiful shrubs have been planted in both American and English gardens for over 200 years, including gardens of George Washington and Thomas Jefferson.
St. Patrick’s Day, March 17, is a popular celebration in the United States, due to the number of Americans, 10.5%, with Irish heritage. One million Irish emigrated to North America, Australia, or other parts of Great Britain in the mid-1800s because of the potato disease now known as late blight. Late blight, caused by the water mold, Phytophthora infestans, destroyed the Irish potato crops in 1845 through 1849 and caused the Irish Potato Famine. Another one million people died from hunger or disease.
Virginia creeper is a native North American, deciduous vine, which can easily climb 30 feet or higher. Its tendrils end in oval shaped disks that adhere to surfaces and can damage stucco, the mortar between bricks, and painted surfaces. This highly adaptable plant grows in full sun to full shade. Grown as a groundcover, it can provide erosion control on slopes. Virginia creeper is very drought tolerant and a vigorous grower. To control the spread of this somewhat aggressive vine, prune, mow, or weed whack in the spring.
Virginia copperleaf is a tall, branched summer annual that can grow three feet tall. It takes its name from the copper colored leaves of its late summer color. This weed is a North American native that is found from Maine to Georgia and as far west as Texas and north to South Dakota. It is a member of the spurge family and is poisonous, but it does not have the milky sap that is typical of other family members. The simple leaves are oppositely arranged on the stems when the plant is a young seedling, but they change to an alternate arrangement as the weed matures.
It’s late summer and crabgrass weeds have invaded some lawns. Unfortunately, crabgrass is very difficult to control with most herbicides once it develops a few tillers or branches. There are several species of crabgrass (Digitaria spp.): tropical crabgrass, smooth crabgrass, India crabgrass, large crabgrass, Southern crabgrass, and blanket crabgrass. All of them are summer annuals that germinate primarily in spring, grow during the summer, set seeds, and then die with the first frost.
Smilax vines go by the common names greenbrier or catbrier due to the thorns covering their stems. There are 300 to 350 smilax species worldwide. Approximately twenty-four species are native to North America, with fifteen species growing in South Carolina. Smilax grows well in moist shade and is an important food source and habitat for wildlife, including birds, rabbits, and deer.
Cudweeds (Gamochaeta spp.) are herbs in the aster family that serve as host plants for American painted lady caterpillars. There are about fifty plus species, and all are native to the Americas. Most cudweeds are annuals and can be either winter or summer annuals. They flower in mid-spring to early summer or in early fall. Some cudweeds can be biennial, meaning that they will form a basal rosette that can survive the winter and flower in their second year.
This North American native plant is a relative of the popular holiday poinsettia. Both plants are members of the euphorbia family. This plant is sometimes grown for the colorful green and orange bracts, but it is considered a weed.
Lambsquarters (Chenopodium album) is a close relative of quinoa and is generally considered a famine food. It was once a popular green but lost favor after spinach was introduced to Europeans around the 16th century. Although the plant is dense in nutrients, it can be mildly toxic if eaten in often or large quantities. Luckily, cooking resolves this issue. It remains a pervasive weed in agriculture and is found throughout the United States. Lamb’s quarters can be found in waste areas, roadsides, home gardens, and landscape beds.