straw looking grass after a tough winter - Knowledgebase Question

ELKTON, FL (Zone 8B)
Question by jgongla
March 14, 2009
this winter in North Florida has been tough. Several frosts have left my St. Augustine grass looking like straw (except for the weeds of course} I have applied Scotts Bonus S and atrazine for the weeds but it's not getting there. What should I be applying as the weather gets warmer both short and long term. Nitrogen? What's best for these pesky weeds of all varieties?

John


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Answer from NGA
March 14, 2009

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I would mow the weeds and grass down and then proceed with regular mowing and good lawn care. Good lawn care can be summarized in three cultural practices: mowing, watering and fertilizing. If you will do these three properly, your lawn will be the best on the block! Frequent mowing is better than infrequent mowing. Mow on a 5-7 day schedule, removing no more than 1/3 of the leaf blade with each mowing. For example, a St. Augustine turf should be mowed to 2 1/2" when it reaches 3". While many homeowners like to water 15 minutes a day, your turf will benefit from a good soaking applied less often. Apply 1/2 to 1 inch of water once or twice a week. A coffee can makes a good rain gauge to test out how long it will need to be run to apply an inch. Frequent wetting promotes disease problems and a shallow rooted turf. Let the soil dry out a bit between waterings and the grass will develop a deep root system and do much better. Fertilize with no more than 1/2 to 1 pound of nitrogen in spring after you have mowed the grass twice, and again in fall (around late October). Apply a product with a 3-1-2 ratio of nutrients as this is roughly the ratio of nutrients grass takes in. So, for example, if you purchased a 15-5-10 fertilizer (15% nitrogen), you would apply about 7 pounds per 1000 square feet (1 pound / .15 = about 7). If you purchased a 21-7-14 fertilizer (21 % nitrogen), you would apply about 5 pounds per 1000 square feet (1 pound / .21 = about 5). Healthy turf will choke out most of its weed problems. When the turf is thin and soil is exposed to the sunlight, weeds will sprout and you have a battle on your hands. So first concentrate on the above 3 cultural practices and you will be amazed at the results. Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!

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