Select a product with a portion of the nutrients in a slow-release form to feed the grass over a longer period of time. New lawns also may benefit from fertilizers that contain minor nutrients including magnesium and iron. Another application may be needed in early to midsummer. I thought the sedge in my St. Augustine lawn would go away after it was killed by the cold. Now it is back.
Sedges usually turn brown for the winter but grow back when the weather warms.
There are several forms of sedge growing in home landscapes. They include the purple nutsedge, yellow sedge and green kyllinga often called water sedge. All common sedges can be controlled with the herbicides Image and Mange. All but the purple nutsedge also can be controlled with the herbicide Basagran. Sedges must be producing green leafy portions for the herbicides to be effective.