04/29/2015
Why doesn't my grass grow well in this area?
Does your lawn grow well in every area except that one annoying spot? Why is this? The answer can be many things but usually is based around one of the following categories:
Sunlight ~ Both St. Augustine and Centipede prefer a sunny location but both can grow fine in semi-shade too. As the area gets shadier, the grass grows thinner - especially Centipede, which does not grow in full shade.
Moisture ~ Turf grasses need the proper balance of water, not too little and not too much. If your problem spot tends to stay wet longer than the other areas in your lawn then this is probably the issue. This can usually be corrected by either improving the drainage for the area or adding sand to the low area - for the best results, do this in late spring through mid summer. On the other side of the spectrum, there are spots that tend to be drier and the soil tends to be harder. Often these areas are unique compared to the other healthy areas of your lawn that they might be on the top of a hill, surrounded by concrete, around roots of trees, or some other difference compared to your other areas. The only simple solution here is to water these areas longer and possibly more often, especially during the hot summer months.
Soil pH ~ This tends to be the hardest to figure out but maybe the easiest to fix. St. Augustine prefers a pH between 6.5-7 (slightly acidic) where Centipede likes the soil much more acidic (5-6.5). The two most common pH problems we see are:
People that have St. Augustine grass and a lot of trees around. These areas tend to have a very low pH and will need lime added once or twice a year.
People with Centipede and their problem area being around concrete (driveway, sidewalks, etc.). These areas tend to have too high of a pH and will need to have amendments added that contain Sulfur (aluminum sulphate or Ironite) which will lower the pH.