Lawn Care

Best Lawn Fertilizer Schedule: When to Feed Grass

Fertilizing your lawn is an art and so should your lawn fertilizer schedule. When doing so there are two vital factors to consider. They include how much fertilizer to apply and when to apply. However, the basic rule dictates that applying about three pounds of nitrogen in each 1,000 square feet per growing season is the ideal measurement.

The above measurement is ideal for Kentucky bluegrass or when the grass is mixed with a perennial species of ryegrass or a fine fescue. Otherwise, other great species of grass that may also require an ideal Grass fertilizer schedule include St. Augustine, Bermuda and Zoysia. All the same calculating percent nitrogen in the bag and the size of your lawn (in square feet) can be done in many ways.

The easiest method that you could use is dividing the rate of nitrogen desired by the percentage of nitrogen in the bag and the resulting figure will then be multiplied by the square footage of the lawn and divide by 1,000.


Factors Affecting Grass Fertilizer Schedule

Lawn fertilizer application program schedules differ a lot with location, weather/ climate, and the availability of materials among other things. The expertise to apply the fertilizer will also play a key role.

When to Apply a Grass Fertilizer Schedule

Even so, the most common fertilizer schedule that many homeowners can use is this, applying their fertilizer in this routine.

  • Early September apply once for low-quality lawns
  • Early May and September apply twice for low/ moderate lawns.
  • Early May, September, Late October and Early November Apply thrice for high-quality lawns.
  • Early May, Mid June, Early September, Late October, and Early November apply four times. This should be done with irrigation and only for very high-quality lawns.

Lawn Grass Fertilizer Schedule for St. Augustine, Bermuda and Zoysia Lawns

Fertilizer Routine

Here is a good grass fertilizer schedule that will work for any lawn that has St. Augustine, Bermuda and Zoysia. Before the schedule what you must know is that for this type of lawn you will be required to fertilize four times. Here is how you will break it down for a great fertilizer schedule/ routine.

Late February – Early March

You should apply a simple 15 – 5 – 10. This is often for an early green pop up for your lawn. You can buy such a combination of a non-slow release that provides for a fast two-week green – up before getting to the heart of the fertilizing schedule. Combine this with a spot-weed-and-feed treatment if you have a turf only landscape.

Late March – Early April

Apply slow release fertilizers. This should be in ratios of 3 – 1 – 2. Some of the most recommended formulations that you could go with include the following options.

  • 19-4-10 Nitro Phos Super Tuff
  • 18 -4-6 Fertilome’s Zero Phosphate
  • 15-5-10 SouthWest Fertilizer Premium Gold
  • 20-0-10 Bonide Premium Lawn Food

Late June – Early July

The same schedule for the slow release fertilizers should apply. Just like we have seen for Late March – Early April; the best ratio to go with is always 3 – 1 – 2.

October – November

Down here, the best lawn fertilizer schedule for St. Augustine, Bermuda and Zoysia lawns would require you to apply winterize formulas. This provides the lawn with enough winter hardiness to survive through the season. You can use different ratios (as advised by an expert). Make sure that every ratio that you use is designed for the winter/ fall and for a southern grass.

Fungicide Routine

Fungicides should be applied twice a year for the best fertilizer schedule for St. Augustine, Bermuda and Zoysia Lawns.

Usually, the Gray Leaf Spot will leave blotchy spots on your lush lawn especially for the St. Augustine Grass. Apply fungicides between July – September. Combine it with a number of active ingredients such as Daconil or Banner.

Additionally, to control the dreadful Brownpatch fungal disease usually the symmetrical brown circles on your grass, you can use any ideal lawn fungicide with Bayleton, Benomyl, or more specifically Terrachlor between September and October.

Herbicide Routine

Additionally, Lawn Grass Fertilizer Schedule for St. Augustine, Bermuda and Zoysia Lawns dictates that herbicide application is vital. Therefore you should apply them as recommended, usually three times a year.

Late October – Early November

Use at least two different types of pre-emergent herbicides. The moss killer or an All-In-One weed killer will be awesome. This will prevent the many types of weed that lawns experience in February and March. Focus however on broad leaf weeds pre-emergent herbicide and another type for grassy weeds like poa anna.

February – March

You should use the pre-emergent control for grassy weeds again. This is often cool for controlling specific weeds such as Goosegrass, the notorious Crabgrass, and Dallisgrass among others from popping up later on in the summer and during the spring. Balan is great for the job and so is Treflan.

May – Early June

This is often the last application for grassy pre-emergent weeds. It is meant to control the fall weeds from invading from August through to September and more. You can use Amaze or a 2-in-1 herbicide too.

Insecticides Routine

Finally, for the best Lawn Fertilizer Schedule for St. Augustine, Bermuda, and Zoysia there is always something small on insecticides and it states the following.

Never put down any forms of insecticides on your lawn unless you are sure that your lawn has a problem. However, between July through to September always be prepared to counter attack the anticipated damage of the chinch bug. It has a distinctive sign. It is always showing up as irregular shaped spots on your lawn along the edges. Ask an expert’s help before choosing the insecticide to go with.


One thing to take note of is this. From June through to September, if you turf suffers from Chlorosis (if your turf looks yellow) or if it is necrotic you should use an application of either liquid iron or sometimes granular. This should be done once a year and that will do the trick.

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