Q: I have this weed all over my yard. Is it going to become sandspurs?

A: The weed you brought into the office is called Globe sedge, Cyperus globulosus Aublet. It is a perennial weed of turf found in moist and sandy habitats. The seedhead is comprised of several spikelets. Each spikelet consists of a long stalk with a round cluster of seeds perched on the end. Cylindric sedge and globe sedge seedheads are very similar in appearance. However, globe sedge seedheads are round, whereas cylindric sedge seedheads are oblong.It will never become a sandspur so you needn’t worry about that problem. It can tolerate any kind of soil conditions from sandy to bog-like. It prefers some shade especially in the afternoon.

Globe sedge is difficult to control it once it matures to reproductive age. You can manage it now by using a non-selective herbicide. Consider applying a pre-emergent herbicide in the early spring of next year to better control this weed. In addition, be sure you are irrigating your lawn appropriately. St. Augustinegrass prefers to be watered deeply but less often in order to build strong deep roots. Consider applying ¾ to 1 inch every time you irrigate, which ideally should be once every 5-7 days. Watch the grass blade. If it is full and green, it does not need to be watered. It would be a good idea to add a rain sensor to your in-ground irrigation system. A rain sensor will prevent your irrigation system from going on if we have received sufficient rain.

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Posted: July 16, 2017


Category: Home Landscapes
Tags: Cyperus Globulosus, Globe Sedge, Weed


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