Fertilizer Blackouts

Need to grow turf during a fertilizer blackout?
TopDressing during the Florida Blackout
Adam Burton applying Mirimichi Green during the Florida fertilizer blackout.

Beat the blackout

States and municipalities are increasingly enacting fertilizer application restriction periods, known as blackout dates.

What is a fertilizer blackout?

During a fertilizer blackout both homeowners and professional landscapers / applicators are restricted in their use of Nitrogen and/or Phosphorus containing fertilizers.  The specific regulations vary and you should check with your local extension agent if you are unsure what rules may apply to you.

Why are there fertilizer blackout dates?

Runoff from excessive nutrient application can lead to toxic algae blooms, harming aquatic ecosystems and the people who rely on them.

What can I use to “fertilize” during a fertilizer blackout?

You can still grow great turf, improve soil fertility, and continue to impress customers with lush, green grass during a fertilizer blackout.  

Mirimichi Green recommends 5 core products for consideration when you need to grow turf during a fertilizer blackout. These products all support healthy soil and make current nutrients more bio-available to the plants.

  • Release ZERO – An organic liquid soil amendment, Release Zero can be sprayed on the leaves or drenched into the soil. This organic liquid concentrate from our Release Line delivers nano-sized miconutrients without restricted NPK. Zero means zero NPK.
  • CarbonizPN – Our original bulk soil amendment. This substantial product is best applied with a motorized spreader either under new sod, or topdressed over an existing lawn.
  • LESCO CarbonPro-G – An easily spreadable granular, this product delivers premium organics, activated biochar, and added microbes for optimal soil health. (exclusively sold at SiteOne Landscape Supply)
  • Essential-G – An easily spreadable granular, this product delivers premium organics, activated biochar, reclaimed coffee grounds, humate, and silicon for optimal soil health.
  • ByoSpxtrum (Bio•Spectrum) – A water soluble powder, this complex combination of microbes, microbial food, soil amendments, and critical enzymes can be sprayed alone or with other liquid applications. This microbial fertilizer that will take the unavailable nutrients already in the soil and make them available to the plant without an additional synthetic fertilizer application.

Which product / products should I chose during a fertilizer blackout?

Use any these products individually or mix and match to your available equipment and needs.

For example, use Mirimichi Green Release Zero to provide essential plant micronutrients along with a carbon-building soil amendment to promote the growth of beneficial soil biology and the “mining” of existing soil N-P-K. Mining N-P-K in this manner unleashes nutrients already latent in the soil profile but previously unavailable for plant consumption, all without additional application or risk of runoff. For help with your program, contact your field rep or live chat with us here. 


As of this writing, 32 Florida counties have or contain municipalities which have fertilizer restrictions in place. Thanks to the University of Florida and the Institute of Food and Agricultural Sciences for compiling this information. Last updated 06/06/2019.

They are:

  • Alachua
  • Brevard
  • Broward
  • Charlotte
  • Citrus
  • Collier
  • Columbia
  • Duval
  • Escambia
  • Hendry
  • Hernando
  • Hillsborough
  • Indian River
  • Lake
  • Lee
  • Leon
  • Manatee
  • Marion
  • Martin
  • Orange
  • Osceola
  • Palm Beach
  • Pasco
  • Pinellas
  • Polk
  • Sarasota
  • Seminole
  • St. Johns
  • St. Lucie
  • Suwannee
  • Volusia
  • Wakulla

For more specific information, please refer to the table below. You can filter and click on individual rows for more information.

Florida Fertilizer Ordinances

Legal disclaimer

While most regulations restricting fertilizer are targeting macronutrient blends of NPK with guaranteed analyses, some regulators exclude anything containing even trace amounts of these elements which would include composts and most other soil amendments as well.

Accordingly, Mirimichi Green disclaims all express and implied warranties regarding the legal compliance for products recommended and compiled here, including but not limited to any warranty of accuracy, completeness, currency, reliability, or fitness for a particular purpose. Mirimichi Green encourages users to review the full text of applicable ordinances, to contact officials and experts in relevant local jurisdictions and County Extension Service offices with questions, and to seek professional legal counsel for information and assistance in complying with regulations.

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