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The best type of fertilizer depends on the type of grass and your desired end result. Generally speaking, slow-release fertilizers are best for grass, as they gradually release nutrients into your soil instead of all at once, which meets the needs of many grass types. However, the tradeoff is that slow-release fertilizers contain phosphorus, which negatively impacts local water quality. Also, some grasses require different formulations to meet the demands of the soil. Test your soil to see how acidic or alkaline it is before choosing a fertilizer. 

Carpetgrass is a low-maintenance grass requiring little fertilization that thrives in subprime growing conditions. However, regular mowing is necessary to avoid the growth of unsightly seed stalks, and you may have to water it frequently to prevent drying out the soil. That includes watering the grass over dry winters to help keep it healthy, and it may start dying out in particularly cold climates where it grows poorly. Carpetgrass can also be vulnerable to some types of turf fungus, so it’s important not to overthatch. 

If your grass is stressed from being over-trimmed, try watering it heavily and then allowing it to recover for at least two weeks before mowing again. If you notice brown patches where the grass has died off because it’s too short, you should remove the dead grass and overseed the area. Leaving dead patches can invite weeds and other problems, so if you want a totally green lawn, getting rid of dead patches should include removing the dead sections before reseeding the area.

Fertilizing is optional after dethatching. However, the period immediately after dethatching is generally considered the best time to fertilize your lawn because the thick debris is now gone. As a result, applying water and fertilizer as the final steps of dethatching can help to spur incredible growth.