Is it advisable to dethatch St. Augustine Grass zone 9 . How deep can you go without hurting or completely ripping it up? Any advice for this process would be appreciated. Thanks Cindy
St. Augustine Maintenance
Certified GKH Gardening Expert
St. Augustinegrass lawns don’t usually have a thatch problem unless they were over-fertilized and were mowed infrequently in the past. Before you dethatch, go out and examine your lawn grass. Is the grass growing on the soil or on a layer of thatch? If the thatch is less than ½ inch thick, you should not dethatch.