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I just moved to South Jordan and I have clumps of grass pok-a-dotting my lawn. Some say it is crab and others say Johnson. The clumps are hard and raised.
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There are several clump grasses that can be "weeds" in lawns. Tall fescue is a perennial clumping bunch grass with wide blades, dark green shiny leaves and a link to images of tall fescue http://www.invasive.org/search/action.cfm?q=tall%20fescue . Crab grass is an annual plant that has a shallow fibrous root system with a seed head with 3 to 4 finger-like spikes.
Johnson grass - here is link to selected images of Johnson grass http://www.invasive.org/browse/subject.cfm?sub=3075
So perhaps from these pictures you can determine what you have in your lawn. Or you can come by our office with a fresh sample for identification. We will have Master Gardeners on Monday August 25 from 1 pm to 4pm at 2001 South State Rm S1008 hold a plant problem diagnostic clinic to help folks identify their plant problems and provide management recommendations.
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