weeds types of weeds - san diego master...

Weeds Plant A Seed, Watch It Grow Master Gardener Association of San Diego County WEEDS Types of Weeds Weed species are either broadleaf or grassy type. A few examples of broadleaf weeds are clover, dandelion, and purslane. Some examples of grassy type weeds are nutsedge, pampas grass, and bermuda grass. Weeds can be further divided into annuals, biennials, and perennials. Common Purslane Annuals complete their life cycle in one year. Summer annuals, such as crabgrass, germinate in the spring and die in the fall with the onset of colder weather. The seeds they produce during the growing season remain in the soil over the winter and germinate the following spring when soil temperatures rise. A single plant may yield more than 10,000 seeds. Many weed seeds remain viable for 20-70 years. Biennials such as cheese weed (broadleaf) live for two years. Perennial weeds live longer than two years. Simple perennials reproduce by seed. Common examples are dandelions, plantains, and chicory. Creeping perennials reproduce by seed, but can also spread by rhizomes, stolons, and underground storage organs such as bulblets. Examples are nutsedge, oxalis, bermuda grass, and kikuyu grass.

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Weeds

Plant A Seed, Watch It Grow Master Gardener Association of San Diego County

WEEDS

Types of WeedsWeed species are either broadleaf or grassy type. A few examples of broadleafweeds are clover, dandelion, and purslane. Some examples of grassy typeweeds are nutsedge, pampas grass, and bermuda grass. Weeds can be furtherdivided into annuals, biennials, and perennials.

Common Purslane

Annuals complete their life cycle in one year. Summer annuals, such ascrabgrass, germinate in the spring and die in the fall with the onset of colderweather. The seeds they produce during the growing season remain in the soilover the winter and germinate the following spring when soil temperatures rise.A single plant may yield more than 10,000 seeds. Many weed seeds remainviable for 20-70 years.

Biennials such as cheese weed (broadleaf) live for two years.

Perennial weeds live longer than two years. Simple perennials reproduce byseed. Common examples are dandelions, plantains, and chicory. Creepingperennials reproduce by seed, but can also spread by rhizomes, stolons, andunderground storage organs such as bulblets. Examples are nutsedge, oxalis,bermuda grass, and kikuyu grass.

Weeds

Plant A Seed, Watch It Grow Master Gardener Association of San Diego County

Bermuda Grass

Common bermuda grass, yellow nutsedge, and some other perennial weeds aremost effectively controlled with a systemic herbicide that is applied before the soilis dug and when weeds are actively growing. Always contact the pest controldepartment for your school district if you think herbicide treatment may beneeded.

Weeds

Plant A Seed, Watch It Grow Master Gardener Association of San Diego County

Yellow Nutsedge Spotted Spurge

WEED IDENTIFICATION AND MANAGEMENT TOOLS

The UC IPM website has a Weed Identification Tool and a Weed Photo Gallery.The photo gallery includes links to the pest notes specific to each weed whichdescribe the lifecycle of the weed, impact, and management of the weed.

Click this link http://www.ipm.ucdavis.edu/TOOLS/TURF/PESTS/weedkey.html togo to the Weed Identification Tool.

Click this link http://www.ipm.ucdavis.edu/PMG/weeds_common.html to view theWeed Photo Gallery.

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