Skip to Content
Dandelion weed in lawn, spraying weed killer herbicide. Home lawn care and landscaping concept

When Is the Best Time to Spray Weed Killer in Florida?

Spraying weed killers in Florida requires balancing effective weed control and lawn protection.

The best time to spray weed killer in Florida is during the spring and fall seasons when weeds are actively growing but before they mature and produce seeds.

Do you know the ideal conditions for using weed killer in your yard? Keep reading to learn about achieving a weed-free lawn in the Sunshine State.

Key Takeaways

  • Spring in Florida is crucial for setting up a healthy lawn, involving pre-emergent herbicides and fertilization to curb weed growth.
  • Summer weed management in Florida requires careful balance, including using post-emergent herbicides and maintaining taller grass to protect the soil.
  • Fall is the time to strengthen lawn defenses with another round of pre-emergent herbicides.
  • Winter lawn care in Florida is less about active management and more about planning and monitoring for the upcoming growth seasons.

Targeting Weeds by Florida Season

Spraying weed killer in Florida lawns requires a strategic approach tailored to each season’s conditions.

Spring (February-May): Prep for Growth

spring season

Spring in Florida signals new growth and germination in the life cycle. This season is crucial for establishing a healthy lawn and preventing weed issues before they start.

To ensure successful weed control while landscaping, it’s essential to focus on critical spring activities, such as:

  • Pre-emergent Herbicides: Apply to prevent weed or grass seed germination.
  • Fertilization: Schedule fertilization to promote healthy turfgrass and root development.
  • Mowing: Mow your lawn regularly to maintain optimal height for your grass type (e.g., 2-3 inches for turfgrass).
  • Seeding (Optional): Plant warm-season grasses like Bermuda or Zoysia, though generally recommended in late spring or early summer.

Summer (June-August): Maintain Control (Cautiously)

summer season

Summer temperatures, especially in Central Florida, are high. Often, careful weed management is required to avoid damaging the lawn. To navigate the summer months effectively, take these precise management tips:

  • Post-emergent Herbicides: Target existing weeds like crabgrass.
  • Watering: Schedule deep and infrequent watering to strengthen the root system.
  • Mowing: Slightly higher (3-4 inches) to shade soil and reduce weed sprouting.
  • Monitoring: Regular checks for weed outbreaks and turf health.

Fall (September-November): Build Defenses

fall season

Fall is a critical period for fortifying your lawn against winter weeds. Transition into these fall defense strategies for ensuring your lawn stays weed-free during the cooler months:

  • Pre-emergent Herbicides: Prevent winter weed germination.
  • Overseeding: With cool-season grasses like fescue for a green winter lawn in North Florida.
  • Mulch: Use around plants to reduce weed growth.
  • Fertilization: Apply to strengthen grass before winter dormancy.

Winter (December-January): Plan Ahead

winter season

Winter in Florida sees reduced weed and grass growth. You can ensure a stronger lawn in the growing seasons by preparing during this quieter time with these winter lawn care tips:

  • Monitoring: Keep an eye on any resilient winter weeds.
  • Planning: Set a schedule for pre- and post-emergent applications in the coming year.
  • Fertilization: Light feeding for areas with cool-season grass.
  • Soil Testing: Check pH and nutrient levels for adjustment.

When to Apply Weed Killers

To manage different types of weeds in horticulture, timing is crucial when applying weed killers, such as pre-and post-emergent herbicides.

Pre-Emergent Herbicides

Granular pre-emergent herbicides are used as preventers. Meaning they prevent weed seeds from germinating.

Target Time


Why This Timing

Late Winter to Early Spring

Best for preventing crabgrass and other summer annual weeds.

Soil temperatures start to rise, which spurs weed germination.

Early Fall

Effective for autumn germinating weeds such as annual bluegrass and chickweed.

Weeds germinating in cooler weather can be effectively curtailed before they take root.

Post-Emergent Herbicides

Post-emergent herbicides kill weeds that are already growing.

Target Time


Why This Timing


As weeds like dandelions begin to bloom and actively grow.

Weeds are in their growth phase, making them more susceptible to herbicides.

Late Summer

When tough perennial weeds are more vulnerable.

Post-emergent herbicides can effectively target and kill tough weeds before they go dormant.

Is It Time to Call the Experts?

If you find that your weed problem persists despite your best hand-pulling efforts, it's a clear sign that professional lawn care help might be needed.

Hiring a professional lawn care company (like us at Native Pest Management) can save time and ensure weeds are managed efficiently. As professionals, we have specialized knowledge and equipment to tackle even the toughest weeds.

It's worth researching us to find the best fit for your needs.