Dethatching St Augustine Grass

St Augustine grass happens to be one of the most sensitive types of grass. That being the case, it’s important to know exactly how to dethatch St Augustine grass before you get started. If you’re wondering what thatch is please read our article What is Lawn Thatch? We’ve also written a general article on dethatching, Thatch Removal - Dethatching, which is also worth a read if you’re considering undertaking this lawn maintenance chore.

Specifically related to St Augustine you need to consider a few different variables.

How do I know its time to dethach my St. Augustine grass?
If you have more than a half an inch of thatch, or decomposed plant material, its time to dethatch.  If you examine your grass you should be able to determine if the grass is growing on soil or thatch.  If its that latter you know what to do.

Do I need special equipment for St Augustion grass dethatching?
Yes!  The power tool you rent to dethatch should have vertical blades.  Its also critical you find vertical blades that are adjustable left to right, so you can put at minimum of 3″ between the blades.  This ensure that the stolons aren’t cut permanently damaging your lawn.

When should I dethatch?
Only dethatch when your St Augustine is growing vigorously.  This is usually in the June to July time frame.

What should I do after I’m done dethatching?
Once you’re done dethathing give your lawn a healthy dose of fertilizer and water as its been traumatized and needs some extra nutrients to recover.

Now that the thatch has been removed your St Augstine grass should flourish.  All the restriction of air, water, and fertilizers are removed.  Get that lawn mower blade sharpened!