Don’t Be In A Hurry To Fertilize Your Lawn

March 6, 2010

Warmer weather is arriving, but don’t be in a hurry to fertilize your lawn — that’s the word from the University of Florida IFAS Extension office.

Even though it is still winter, now is the time of year that local garden centers begin major advertising campaigns to sell lawn fertilizers. It is too early to fertilize your lawn.

Fertilize when the lawn is actively growing

theresafriday.jpgWarm-season lawns, including St. Augustinegrass, zoysiagrass, and centipedegrass go dormant in winter in Northwest Florida. Fertilizing now would be a waste of time and money. Why shouldn’t you fertilize warm-season grasses when they are dormant? First, when grasses are dormant, their roots are not able to absorb or use the nutrients from fertilizers. By the time the grass does begin actively growing, most of the nitrogen you applied will have been lost from the soil. A safe time to apply your first lawn fertilizer is around April 15th.

Don’t feed the weeds

Fertilizing while the grass is dormant actually encourages more winter weeds, because you are fertilizing the weeds instead of the lawn. Without competition from the lawn, these weeds will grow faster and become more prolific as a result of dormant fertilizer applications.

Lastly, fertilizing lawns during their transition into dormancy in the fall or out of dormancy in the spring may encourage lawn growth that is more likely to be injured from winter kill. Bare spots and thinning of the lawn as well as delay in spring green-up may occur when lawns are forced to grow when they should be dormant.

Combo products not the answer

ferti.jpgMany of the products available are convenient “weed and feed” products that combine a pre-emergent herbicide and fertilizer in one application. Unfortunately, the ideal time to apply a pre-emergent herbicide is very different than the ideal time to apply fertilizer for warm-season lawns.

In northwest Florida, the recommended application window to maximize the effectiveness of preemergent herbicides is typically between February 15 and March 5.

The application timing for these products is critical since they must be applied before summer annual weeds germinate in spring. It’s always better to apply preemergent herbicides a little earlier rather than too late. And don’t forget to activate them by watering them into the lawn.

For St. Augustine grass, centipede grass, and other warm-season grasses, buy fertilizer that is separate from the pre-emergent herbicide. Apply each at their recommended times.

Finding a separate pre-emergent herbicide, not in weed-n-feed form, may be difficult. Some ones to look for include: benefin (Sta-green Crabgrass Preventer, Hi-Yield Crabgrass Preventer), pendimethalin (Pre-M, Pendulum, Turf Weedgrass Control, Halts Crabgrass Preventer), and bensulide (Green Light Betasan Crabgrass Preventer).

Start with a soil test

A soil test is always a good starting point before investing in fertilizer or lime. Your local University of Florida County Extension office can help you get started.

Theresa Friday is the Residential Horticulture Extension Agent for Santa Rosa County.

Comments

7 Responses to “Don’t Be In A Hurry To Fertilize Your Lawn”

  1. mikedad on April 8th, 2022 10:46 am

    Ok,
    so here it is 8 Apr and Ivet done nothing is it too late anything I can do now to weed or fertilize my messy lawn? thx

  2. Laurie Joyce on March 30th, 2018 3:34 pm

    I forgot to put down the pre-emergent! Is there anything I can do now to stop the weeds?

  3. Gary in FWB on February 18th, 2017 12:42 pm

    Good to know. We moved into the area over the winter and I was thinking I should fertilize the St Augustine soon. Today is Feb 18 so instead I will treat with a pre-emergent herbicide.

    BTW, what is a good or best fertizer type or brand for NW FL Panhandle?

  4. Daharleymon on April 15th, 2016 8:23 am

    Short and to the point, very informative. Thanx!!

  5. Cynthia Walsh-Scanlon on March 15th, 2010 8:12 pm

    Thank you very much for this information. I almost made the mistake of fertilizing my lawn.

  6. Mrs.Goodie on March 6th, 2010 5:22 am

    Thank you for this information.

  7. Deni on March 6th, 2010 12:28 am

    Thanks! Very useful information.