Florida's Nitrogen Fertilizer Ban from June 1 to September 30: What It Means for Your Lawn

Every year from June 1 through September 30, Florida counties and municipalities prohibit applying fertilizers containing nitrogen or phosphorus to lawns and landscapes — and violating it can result in fines.

Here is what the ban covers, why it exists, and how to keep your lawn in good shape through the summer.

What Does the Florida Fertilizer Ban Actually Prohibit?

Any fertilizer product containing nitrogen or phosphorus cannot be applied from June 1 through September 30.

A few things to know:

• The ban applies to both synthetic and organic fertilizer products
• If the fertilizer bag shows a nonzero first number (nitrogen) or nonzero second number (phosphorus) on its guaranteed analysis label, it cannot go down during the ban
• The restriction covers residential and commercial properties alike, including applications made by lawn care professionals

The fertilizer ban is in effect throughout Florida but specific ordinances vary, so confirm the rules that apply to your address through your county extension office or local government website.

Notable year-round restrictions that also apply:

• No fertilizer within 15 feet of any water body (some counties require 25 feet)
• Fertilizer granules that land on sidewalks, driveways, or streets must be swept back onto the lawn rather than left to wash into storm drains

Why Does the Ban Exist?

Florida summers bring intense, frequent rain. Afternoon storms capable of dropping two or more inches in a single hour are common from June through September.

Florida's sandy soils do not hold nutrients the way heavier soils do. When a hard rainstorm hits a recently fertilized lawn, nitrogen and phosphorus wash off the grass, through storm drains, and into nearby lakes, rivers, bays, and coastal waters.

Once in the water, those nutrients fuel rapid algae growth. When algae blooms die and decompose, they consume dissolved oxygen — creating dead zones where fish and aquatic life cannot survive. These blooms can also pose health risks to people and pets and damage local economies that depend on clean waterways.

The practical reality: applying nitrogen right before a summer downpour is also a waste of money. Most of it leaves the root zone before your grass ever absorbs it.

What Can You Still Apply During the Ban?

The ban does not stop all lawn care. Here is what is generally permitted from June 1 through September 30:

Iron supplements Zero-nitrogen, zero-phosphorus iron products are allowed. Iron can help maintain some green color in the lawn during summer without contributing to runoff.

Potassium (potash) Products containing only potassium — with no nitrogen or phosphorus — are generally permitted and can support turf stress tolerance during the summer.

Slow-release nitrogen applied before June 1 The ban restricts application, not nutrients already in the soil. Polymer-coated controlled-release nitrogen fertilizer applied before June 1 continues releasing slowly through the summer and remains compliant with ordinances. UF/IFAS recommends this approach in their Green Industries Best Management Practices guide. If you plan to use this strategy, apply in the final weeks of May and water it in immediately.

Compost and soil amendments Most county ordinances exempt compost from the fertilizer ban. Check your specific local ordinance to confirm.

What to Expect From Your Lawn During the Blackout

Some color change and slower growth during the ban period is normal — especially in dry summers or on lawns that were not well-fed heading into the season.

A few practices that help your lawn hold up through the summer:

• Mow higher, not lower. Cutting St. Augustine grass too short stresses the plant and opens the door to weeds, pests, and disease. Keep mowing height at 3.5 to 4 inches through the summer months.
• Leave the clippings. Grass clippings decompose and return a portion of nutrients to the soil. During the fertilizer ban, this makes a real difference — do not bag them.
• Water carefully. Overwatering promotes the shallow roots and fungal pressure that Florida's humid climate already encourages. Water only when your lawn shows early drought stress signs, keep your rain sensor functioning, and follow your water management district's current schedule.

What Happens When the Ban Lifts on October 1?

Fertilizer containing nitrogen can be applied again starting October 1 — but most Florida county ordinances require that at least 50 percent of the total nitrogen be slow-release during the off-season period.

Before the first fall application, a soil test is worth considering. It tells you exactly what your lawn needs coming out of the summer and helps you avoid over-applying nutrients that may already be adequate. Your local UF/IFAS county extension office can point you toward approved testing methodology.

Are There Fines for Violating the Ban?

Yes. Fines vary by county and municipality, but violations are enforced by local code enforcement agencies. Lawn care professionals are subject to the same restrictions as homeowners — if you hire a lawn service, confirm they are following the ordinance for your area.

Have questions about what treatments are appropriate for your lawn during the fertilizer ban? Assuregreen Property Services offers lawn care services throughout Tampa Bay and surrounding areas. Contact us to learn more.