Nutgrass, also called nutsedge, could easily be one of the top 5 nuisance weeds gardeners deal with in the garden and landscape. While we don't know that for sure, we do know that nutsedge is a very challenging weed to control.
Yellow and purple nutsedge are the two species most often found in California. Yellow nutsedge grows throughout the state, while purple nutsedge is found mostly in southern California.
Nutsedge is difficult to control because the plants form small underground tubers and rhizomes. Most of these tubers are found in the top six inches of the soil but can also be found even deeper. Removing the tubers by hand is the best way to remove small plants but may require continued monitoring and hand...
In mid-March, many people use clover-themed decorations in preparation for St. Patrick's Day. Many gardens and landscaped areas are “decorated” with clovers too, especially with recent rains and mild temperatures in much of California. For some people, clovers are considered weeds, but others enjoy the green color they bring!
Clovers begin to germinate in the fall and continue throughout winter and early spring. Their bright green leaves can blemish the look of lawns and may be unsightly when found in ornamental plantings.
Clovers growing in lawns or landscapes are often a sign of low soil nitrogen, so changing fertilization can help prevent their growth. Read the UC IPM publication
Not everyone has a lawn, but if you do, fall is the perfect time to give your lawn some much-needed attention. To find out if you are maintaining your lawn properly, answer the following questions:
Controlling unwanted trees, shrubs, and woody perennial grasses can be difficult in landscapes, gardens, and natural areas. These troublesome woody plants often resprout after being cut back, and the resprouting shoots can outnumber the original plants. Some woody weed plants are natives but in certain settings can create fire hazards and become problematic to human health and movement.
So how can you manage plants like ivy, bamboo, and poison oak?
A new version of Pest Notes: Woody Weed Invaders, authored by UC Davis plant scientists Joseph DiTomaso and Guy Kyser, is now available online and in print. Use this guide to find answers to the...
Now is the time to prepare your garden and landscape for winter. The simple tasks recommended below will help prevent perennial weeds, insect pests, and certain disease pathogens so these problems don't get established and become difficult later.
- Manage weeds using nonchemical methods such as cultivation, handweeding, or mowing.
- Prevent weeds using competitive plants, mulches, and hand removal.
- Herbicides (weed killers) are rarely needed in established landscape plantings when nonchemical controls are used regularly.
To learn more about managing weeds, see the UC IPM Pest Note: Weed...