by 
The Curious Bag
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<h4 class="dechead">On One Hand: Every Few Months
Fertilize your lawn at least five times during the year (every 2-3 months). Fertilization will keep the lawn loaded with the nutrients it needs to keep producing a thick, lush lawn, and can help your grass roots grow deeper and stronger.
On the Other: Twice a Year
Using a slow-release fertilizer just twice a year can potentially be better for your yard because it won't burn your grass. Less frequent fertilization with slow-release products will keep your lawn from losing nutrients because of rain run-offs or any excessive precipitation. Overfertilizing can expose your lawn to diseases and straw buildup.
Bottom Line
Fertilize a lawn several times a year depending on the type of grass and fertilizer you use. Fertilizing at least three times (spring, summer and fall) will keep your lawn healthy all year round.
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