1、Best Fertilizers for Watermelons

If your watermelons need an instant boost or you missed the fertilization, you can apply an instant/fast release fertilizer; otherwise, slow-release fertilizers are the best choice.

2、What Kind of Fertilizer for Watermelon: Optimal Nutrients for Sweet

I use granular, water-soluble, or liquid fertilizers depending on the plant’s needs and my application preference. Side dressing with calcium nitrate can also promote fruit development.

3、Best Fertilizer For Watermelons [Oct 2026]: Top 6 Picks

To help you determine the best fertilizer for watermelons, we’ve combined a list of the 6 top picks from the market. Read on!

4、Best Fertilizer for Watermelon: Top Growing Guide

Discover my expert guide on the best fertilizer for watermelon to grow sweet, juicy fruits. Learn proper nutrient ratios and timing for a bountiful harvest in your garden

5、The Best Fertilizers for Watermelons and Melons

Discover the best watermelon fertilizer for a bountiful harvest. I share my top picks and tips for growing delicious watermelons.

The Best Fertilizer for Watermelons (2026 Guide)

Discover the best fertilizer for watermelons. This guide explains the 2-stage NPK strategy, when to switch, and tips for sweeter, juicier fruit.

Which Water

Finding the best fertilizer for watermelons can be challenging as there are so many options in the market, but we have created this buying guide to help you choose the best one.

10 Best Fertilizers for Watermelon to Grow Juicy, Sweet Fruit

I’ve found that specialized watermelon fertilizers like LEAVES AND SOUL Professional Liquid Melon Fertilizer (5-1-5) and Farmer’s Secret Fruit & Bloom Booster deliver exceptional results for sweet, juicy fruit.

15 Best Fertilizers for Watermelon: Organic & Inorganic

In this article, we will explore the 15 best fertilizers for watermelon, both organic and inorganic, and provide you with valuable tips on fertilizing your watermelon plants. Organic fertilizers offer a natural and sustainable approach to nourishing your watermelon plants.

7 Picks for Best Fertilizer for Watermelons

A big part of your watermelon success will depend on ensuring your watermelon plants have all the nutrients they need to produce large, healthy fruit. Using fertilizer is a sure way to feed your garden and boost its growth. I’ve listed the best six fertilizers for watermelons. Keep reading to learn more!

Watermelon, as an important summer fruit, has high nutritional demands during its growth. Proper application of water-soluble fertilizers can effectively meet its nutrient needs and promote healthy development. Below are recommendations for suitable water-soluble fertilizers and application methods for watermelons:

I. Nutrient Requirements of Watermelons

1. Nitrogen (N): A key nutrient for protein synthesis, nitrogen is critical during the early growth stages to support leaf expansion and photosynthesis.
2. Phosphorus (P): Enhances root development, disease resistance, and fruit formation/maturation.
3. Potassium (K): Improves drought/frost tolerance and enhances fruit quality and taste.
4. Microelements: Essential elements like iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn) prevent deficiencies that harm plant health and yield.

II. Recommended Types of Water-Soluble Fertilizers

1. High-Nitrogen Formulas: Ideal for early growth to rapidly expand leaf area and boost photosynthesis.
2. Balanced Formulas: Contain diverse nutrients suitable for use throughout the growing season.
3. Microelement-Enriched Formulas: Supplement essential trace elements (e.g., boron, molybdenum) to address potential deficiencies.

III. Fertilization Methods

1. Base Fertilization: Apply organic fertilizers before planting to provide foundational nutrients.
2. Topdressing: Use water-soluble fertilizers matched to watermelon’s阶段性营养需求 based on growth stage and soil tests.
3. Foliar Application: Spray directly onto leaves for quick absorption and efficient nutrient uptake.

IV. Key Considerations

1. Dosage: Over-fertilization may lead to excessive vegetative growth (compromising fruit quality), while under-fertilization slows development. Adjust amounts based on growth stages and soil conditions.
2. Timing: Increase fertilization during peak nutrient demand periods (e.g., flowering and fruit expansion).
3. Environmental Impact: Choose eco-friendly products to minimize chemical pollution.

V. Additional Tips

1. Soil Management: Maintain soil structure and organic matter to optimize root development.
2. Irrigation: Ensure adequate moisture—both excess and deficit negatively affect growth.
3. Pest/Disease Control: Use safe pesticides to protect plant health.

Selecting appropriate water-soluble fertilizers and applying them scientifically can significantly improve watermelon yield and quality. Prioritize balanced, stage-specific fertilization while avoiding overuse to ensure sustainable results.