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When To Fertilize Lawn In Flagstaff

May 3, 2016
Brad Bippus

What Kind of Lawn Do I Have?

It’s easy to get spring fever as winter concludes and the days start to warm up.  Many folks begin to think of gardening, green lawn grass, and landscape improvements in March.  Most retailers encourage us to do so by stacking pallets of lawn fertilizer in front of their stores and garden centers. Spring door hangers, flyers, tv, newspaper, and radio ads feature lawn care products and fertilizers.  The enticement of spring is so strong that many people assume April is the best time to fertilize lawns.  But this may not be the case!!

First we need to figure out what type of lawn you have.  Most Flagstaff lawns are comprised of cool-season grasses such as Kentucky bluegrass and turf type fescue blend.  If your lawn needs an irrigation systems and looks like golf course grass, then you have either Kentucky bluegrass or the fescue blend.  There are other types of lawns  that include sheep fescue, blue grama, and blue fescue grasses.  But our focus here will be cool season grasses that most homeowners use for their lawns in Flagstaff.  These other types of grasses will be covered a future blog.

When To Fertilize Lawn In Flagstaff

When To Fertilize Lawn In Flagstaff

Be careful!  Applying a high-nitrogen fertilizer in April may cause grass to grow too fast, before roots can grow to support the lawn. This makes a lawn less tolerant of the brutal June heat.

In most cases, an application of fertilizer in April is not needed when lawns were fertilized the previous fall or when clippings are mulched back into the yard.  If an April application appears to be necessary, apply the fertilizer at a reduced rate.

The Schedule

  • First fertilizing between May 1 to June 15
  • Second fertilizing August 15 to September 15.
  • Third and final fertilizing October 1 to November 1.

The cool-season grasses benefit the most from fall applications of fertilizer, usually sometime in October or November, as shown in the bullet points above.

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