St. Augustine grass is a common type of grass throughout the Gulf Coast area of the United States, as well as in Southern and Central California. Q: I have a resident that has the worst problem with spaghnum moss invading his St. Augustine turf that I have ever seen. That’s the time to weed and feed and water them to a certain thickness so they can survive their summer dormancy with some shred of dignity. St. Augustine grass is usually dormant during the colder winter and fall seasons. Most weeds appear because of improper cultural practices such as mowing too closely or infrequently, improper fertilization or irrigation. Its bright green leaves and clumping characteristics can quickly overtake a lawn transforming what would otherwise be a beautiful lawn into a complete mess of weeds. 2. The first picture shows them (bright green)growing between the St Augustine … Of course, the length of time and desired result will depend on how much St. Aug. grass you put in. Lawn diseases. When it comes to mowing your St. Augustine, a typical height, depending on the variety is about 2–4 inches. If you’ve had St. Augustine or Bermuda in the past, these vigorous grasses can overtake it. Mow St. Augustine grass at your lawnmower's highest blade setting to select against bermuda. St. Augustinegrass is the most shade tolerant warm-season turfgrass. In addition to “hairy Crabgrass” I have these other 2 weeds. Various diseases can be the reason why your grass is dying or appearing as though it is dead. St. Augustine grass spreads rapidly and aggressively via above-ground stolons, or runners. Plant St. Augustine grass during summer. Texas Common, Raleigh, Seville, Palmetto and Floratam are examples of St. Augustine varieties commonly used for home lawns in the southern United States. With any type of grass, including St. Augustine, there are really three ways of fighting weeds. This encourages deeper root growth so that your grass survives during winter dormancy. The lawn is in full sun but obviously poorly drained. I’ve included link to the pictures and am not certain whether they are the same weed in different stages of development. I've had nothing but good experience with St. Aug grass. The St. Augustine grass will eventually overtake the crabgrass, but it may take a long time to achieve the desired result. Fescues are more active in the cold season. If allowed to, St. Augustine grass could overtake and kill most shrubs in your yard. Fall Mowing for St. Augustine. St. Augustinegrass can form a dense lawn that can tolerate light traffic and compete well with most weeds. You see it all over states like Texas, Florida and other Gulf Coast states. Weeds do not overtake healthy turf. 3. Annual Bluegrass is another ugly and unsightly weed in Saint Augustine grass and all other lawn types as well. However, during the fall, you should maintain a height that’s slightly higher than that of the summer. Mow bermuda lawns lower to select against St. Augustine. Augustine is a very aggressive and competitive grass allowing it to compete with weeds. Weed Control: A selective, annual grass and/or broadleaf weed control pre-emergent herbicide that is labeled for use on St. Augustinegrass and applied during late winter and spring will reduce many weeds the following summer. St. Augustine grass is prone to some diseases such as brown patch disease, gray leaf spot, and take-all root rot.. Brown patches of dead grass usually start appearing during fall and spring when the weather is warm and humid. You should, therefore, establish your lawn in mid-summer when conditions are great for the growth and spread of this grass species all over your lawn. St. Augustine is a very aggressive and competitive grass allowing it to compete with weeds. I live in NE Florida and weeds are overtaking my lawn. Being a warm-season turfgrass, St. Augustine grows best during summer. 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