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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.

Depending on the species, most fescue grasses thrive in USDA hardiness zones 3 through 8, though some varieties can thrive as far as zone 10. While it’s a cool-season grass, it has the unique ability to adapt and thrive in many different types of climates. For this reason, you'll mostly find fescue grasses throughout the transitional temperature zones of the country.

The best fertilizer for thick Bermuda grass is an organic fertilizer with an N-P-K ratio high in nitrogen, low in phosphorus, and low in potassium. Organic fertilizers help Bermuda grass grow stronger and healthier by retaining water well, supporting microbiome life, and promoting long-term soil health. However, this type of fertilizer is more expensive than synthetic fertilizers. 

Overfertilizing can burn and kill the grass as well as upset the soil's nutrient balance, leaving your grass prone to disease and infestation. You'll know that you have overfertilized your burn when you have recently fertilized and begin to see brown and yellow patches of dead grass that need to be reseeded.