This summer, you may have noticed what looks like a large dandelion plant covered in blisters growing in your lawn or landscape. It's known as bristly oxtongue, and if you examine or touch it you'll see and feel why. The stems and flower bracts are bristly, and the leaves are covered with blisterlike swellings that are prickly to the touch.
Bristly oxtongue can be an annual weed or a biennial weed. It thrives during the winter and warm weather and can grow to be over 3 feet tall. This weed spreads by seed, which can be dispersed long distances by the wind.
According to the book, Pests of the Garden and Small Farm, you can control bristly...
- Author: Cheryl A. Wilen
I recently attended a Santa Ana River Orange County Weed Management Area (SAROCWMA) meeting and there was an opportunity for participants to update the group about new invasive plants as well as give an update on management of these and others. During the discussion, Ron Vanderhoff from the Orange County Native Plant Society (OC-CNPS), reported new findings of a plant I'd never heard of. In fact, when the group was talking about it, I wasn't sure if I heard the name right.
The plant is called stinknet (Oncosiphon piluliferum), which to me sounds like a game played by 10 year olds. However, the California Invasive Plant Council considers it an emerging invasive weed...
Dandelions are broadleaf plants easily recognizable by their bright yellow flower and puffball of white tufted seeds heads. While this plant is appreciated as a food or herb by many, for equal numbers of others it is regarded as a weed when found growing in lawns, ornamental plantings, and athletic fields throughout the year.
For helpful nonchemical and chemical management solutions to help you control this weed, read the newly revised Pest Notes: Dandelion by UC Cooperative Extension Advisor John Roncoroni.
Weeds can be a real nuisance in gardens and landscapes, and even during the colder winter months, some kinds of weeds continue to grow and thrive. These are called winter annual weeds.
Most weeds are classified as annuals, biennials, or perennials. Annuals complete their life cycle (germinate from seed, grow, flower, set seed, and die) in one year or less, biennials generally complete their life cycle in 2 years, and perennials live longer than 2 years.
Examples of winter annual weeds include chickweed, little mallow, and annual bluegrass. They germinate and actively grow during fall and winter, then produce seed and die by the hot summer months.
If allowed to set seed, annual winter weeds can continue to grow...
Summer is a great time for outdoor activities like camping, hiking, and backpacking. During your adventures in natural areas, be on the lookout for poison oak. Poison oak, a well known plant for most people in California, is widespread in our state and can be encountered in open woodland areas, grassy hillsides, coniferous forests, and open chaparral.
Poison oak looks different depending on the time of year, and may be difficult to recognize. In spring, it has young leaves that are green or sometimes light red, along with small, white-green flowers. In late spring and summer, poison oak foliage is glossy green. As we head into late summer and early fall, the leaves will turn shades of orange and red with whitish-green,...