When and How to Fertilize Palm Trees in Lee & Collier County

When and How to Fertilize Palm Trees in Lee & Collier County

Palm trees are iconic symbols of Florida living—especially in Lee and Collier County, where they line streets, decorate landscapes, and create that signature tropical vibe. But to keep your palms looking healthy, green, and vibrant, proper fertilization is essential.

In this blog, we’ll cover the best time to fertilize palm trees, the right type of fertilizer to use, and how to apply it effectively in the unique conditions of Southwest Florida.

Why Fertilizing Palms Is Important

While palm trees are relatively hardy, they are nutrient-hungry, especially in our sandy, well-draining Florida soils. Without proper feeding, palms often suffer from:

• Yellowing or browning fronds

• Frizzle top (manganese deficiency)

• Potassium and magnesium deficiency

• Slower growth and poor overall health

Correct fertilization helps palms resist pests, tolerate drought, and maintain their lush, tropical appearance all year round.

When to Fertilize Palm Trees in Lee & Collier County

In Southwest Florida, palm trees grow most actively during the warm, rainy season—so that’s the best time to feed them. The general fertilization schedule is:

Three to Four Times Per Year:

• Early Spring (March)

• Late Spring (May–June)

• Late Summer (August–September)

• (Optional) Late Fall (October–November) – for sandy soils or nutrient-deficient palms

Avoid fertilizing in winter when palm growth slows and nutrients may leach away without benefit.

Choosing the Right Fertilizer for Palm Trees

Look for a slow-release granular fertilizer specifically formulated for palms. The ideal fertilizer should have:

• Balanced NPK ratio (Nitrogen-Phosphorus-Potassium), such as 8-2-12 + 4Mg

• Added micronutrients like magnesium, manganese, and iron

• Controlled or slow-release formulation to avoid nutrient burn and ensure long-term feeding

Florida-Friendly Tip:

Use fertilizers approved by UF/IFAS (University of Florida Institute of Food and Agricultural Sciences) for South Florida palms. Avoid quick-release or high-phosphorus lawn fertilizers that can damage palms and leach into waterways.

How to Fertilize Palm Trees Properly

Measure the Trunk Diameter

Use this simple rule of thumb:

1.5 lbs. of fertilizer per inch of trunk diameter, measured about 4 feet above the ground. (Max 15 lbs. per tree per application.

Spread Evenly Around the Drip Line - Do not place fertilizer at the base of the palm! Instead, spread it evenly in a wide circle under the canopy (drip line), where the roots are actively absorbing nutrients.

Water Thoroughly After Application - Watering helps activate the fertilizer and reduces the chance of burn.

Avoid Fertilizer Spikes or Liquid Feeds - These don’t provide enough nutrients and can cause imbalances. Stick to slow-release granules unless directed otherwise by a professional.

Signs Your Palm Tree Needs Fertilizer

• Yellow or brown older fronds

• Frizzled or deformed new growth

• Translucent or thin leaves

• Poor overall growth or palm decline

If symptoms persist even after fertilization, your palm may need micronutrient correction, such as manganese sulfate or magnesium sulfate—but always test your soil first or consult a professional.

Palm Tree Fertilization Mistakes to Avoid

• Using lawn fertilizer on palms

• Fertilizing during drought or dry soil conditions

• Applying too close to the trunk

• Over-fertilizing in winter months

• Skipping essential micronutrients

Need Help with Your Palm Trees?

At Tree Trunk Landscapes, we specialize in tropical landscaping and palm care throughout Lee and Collier County. Our certified team uses Florida-friendly methods and locally approved fertilizers to keep your palms healthy, green, and thriving in our unique Gulf Coast climate.

Let your palms shine as bright as the Florida sun.