17 Exceptional Liquid Fertilizers for Watermelon Growth

Discover the best liquid fertilizer for watermelon, ensuring bountiful growth and succulent sweetness in your garden. Your perfect melon awaits.
BrandMy RatingPrice
Mission Fertilizer
Top Money-Saving Choice
9.2/10
Gardenera
Best for Strong Growth
10.0/10
Pendelton Turf Supply
Best for Versatile Use
9.2/10
Farmer's Secret
Best for Nutrient-Rich Formula
9.2/10
Leaves and Soul
8.8/10

Best Liquid Fertilizer for Watermelon

In the quest for juicy, succulent watermelons, selecting the right liquid fertilizer can make all the difference between a garden full of vibrant green vines and one that yields only disappointment. This guide will illuminate the best liquid fertilizers that nurture these enchanting fruits, promoting lush growth and exceptional sweetness, ensuring every bite is a burst of summer bliss. Dive in to discover the magic of nourishing your watermelon patch with the most effective solutions tailored to satisfy your gardening aspirations.

Top Money-Saving Choice: Mission Fertilizer

Grow 3-1-2 Organic Liquid Fertilizer, Vegitative, Fish Based, Safe, Organic, All Purpose, Nutrient, Plant Safe (8 Ounce)
Highlights
Organic and safe
Easy application process
Nutrient-rich ingredients

We found Grow 3-1-2 Organic Liquid Fertilizer to be our Top Money-Saving Choice, and it's easy to see why!

This affordable, organic option gives your watermelon plants the essential nutrients they crave without burning roots.

With a simple application of just one tablespoon per gallon of water, it's designed for both indoor and outdoor use, making it versatile for any garden.

Plus, the blend of sugar beet extract and fish tankage ensures your plants thrive.

While it does have a strong smell when mixed, we consider the benefits far outweigh this minor inconvenience.

Happy growing!

Be sure to also check out the best liquid fertilizer for arborvitae for more options! Also, here is the price history so you know exactly when to buy!

Price history for Mission Fertilizer on Amazon

Best for Strong Growth: Gardenera Silica

𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 Liquid Silica Plant Supplement - 32oz - WATERMELON Plants Liquid Silica Boost Fertilizer - Stronger Stems & Healthy Leaves for Indoor & Outdoor Watermelons (Makes 180 Gallons)
Highlights
Strengthens plant stalks
Resists environmental stress
Cost-efficient and highly concentrated

When it comes to nurturing our watermelons, we’ve found a gem: the PROFESSIONAL Liquid Silica Plant Supplement! 🌟 Awarded as the Best for Strong Growth, this powerhouse is specifically crafted to strengthen our watermelon plants’ stems and leaves.

With its unique silica formula, it works wonders in reinforcing cell walls, minimizing the risk of breakage.

Plus, it shields delicate leaves from browning, ensuring a vibrant garden.

We love that it’s compatible with both hydroponics and soil gardens, making it a versatile choice. Highly concentrated, this supplement also offers incredible value, promoting vigorous growth while resisting environmental stress.

Give your watermelons the boost they deserve! 🍉

Be sure to also check out the best liquid fertilizer for vegetables for more options! Also, here is the price history so you know exactly when to buy!

Price history for Gardenera Silica on Amazon

Best for Versatile Use: Pendelton Triple 10 Fertilizer

Triple 10 All Purpose Liquid Fertilizer 10-10-10 with Amino Acids (5.5%) & Seaweed Extract (32oz)
Highlights
All-purpose formulation
Easy to measure dosage
High concentrate yields

When it comes to nurturing your watermelon plants, Triple 10 All Purpose Liquid Fertilizer stands out as our top pick for versatile use.

With its balanced 10-10-10 formulation and added nutrients like aminos (5.5%) and seaweed extract, it suits all growth stages.

Whether you're tending to a lush garden or indoor pots, this liquid fertilizer is your trusty sidekick.

Plus, it comes in a user-friendly bottle that makes measuring a breeze!

Just mix 1-2 oz per gallon of water every couple of weeks and watch your watermelons thrive.

Just be mindful of dosage, as overuse may cause leaf yellowing.

Happy growing!

Be sure to also check out the best liquid fertilizer for hibiscus for more options! Also, here is the price history so you know exactly when to buy!

Price history for Pendelton Triple 10 Fertilizer on Amazon

Best for Nutrient-Rich Formula: Farmer's Secret Fertilizer

Farmer’s Secret Fruit & Bloom Booster Fertilizer (32oz) - Super Concentrated - Increases Flowering and Yield on All Varieties of Fruits, Vegetables and Flowers
Highlights
Promotes vibrant fruit growth
Super concentrated formula
Easy to use with watering

We’re excited to share our thoughts on Farmer’s Secret Fruit & Bloom Booster, our pick for the Best Nutrient-Rich Formula.

This liquid fertilizer packs a punch, promoting abundant and vibrant blooms and fruits across a variety of plants, including watermelon!

With its super concentrated formula, just a teaspoon mixed into two gallons of water works wonders—meaning a little goes a LONG way.

We love how easy it is to add to your watering routine every couple of weeks.

Plus, it’s crafted with care in Kentucky by award-winning farmers.

Get ready to watch your garden flourish!

Be sure to also check out the best fertilizer for water propagation for more options! Also, here is the price history so you know exactly when to buy!

Price history for Farmer's Secret Fertilizer on Amazon

Leaves and Soul

LEAVES AND SOUL Professional Liquid Melon Fertilizer | 5-1-5 Concentrate, Liquid Plant Fertilizer for Garden, Healthy Produce, Good Harvest, Multi-Purpose Blend & Gardening Supplies | 8 oz
Highlights
Nutrient-rich formula
Versatile for all melons
Easy to mix and use

When it comes to growing vibrant watermelons, we’re excited to highlight this nutrient-rich 5-1-5 liquid fertilizer from Leaves and Soul.

Its perfect balance of nitrogen, phosphorus, and potassium promotes robust vine growth and sturdy root systems—essential for those juicy melons!

We appreciate how versatile this formula is, catering to both seedlings and mature plants, making it ideal for every stage of your garden.

Plus, it's a breeze to mix with water, simplifying feeding without sacrificing quality.

While tailored applications might be necessary, the promise of a bountiful and flavorful harvest makes this product a standout choice for any melon enthusiast!

Be sure to also check out the best fertilizer for aroids for more options! Also, here is the price history so you know exactly when to buy!

Price history for Leaves and Soul on Amazon

Gardenera Liquid Silica Boost

𝐒𝐔𝐏𝐄𝐑𝐈𝐎𝐑 Liquid Silica Boost Fertilizer and Supplement Spray for Watermelon Plants – Pre-Mixed, Ready-to-Use Liquid Silicon Plant Superfood Mist for Indoor & Outdoor Plants – 8oz
Highlights
Ready-to-Use Formula
Promotes Healthier Plants
Natural Pest Resistance

When it comes to nurturing your watermelons, we’ve found a real gem—the ready-to-use silica spray.

This formulation means no messy mixing; just grab the spray and get going!

We love how it protects those tender leaves from browning and damage, keeping them lush and vibrant.

With its easy foliar application, you’ll see fast results, helping your plants thrive even in tough conditions like heat and humidity.

Plus, it’s eco-friendly and promotes natural pest resistance, reducing the need for harsh chemicals.

Just spray weekly, and watch your watermelons flourish in no time!🌱🍉

Be sure to also check out the best calcium fertilizer for tomatoes for more options! Also, here is the price history so you know exactly when to buy!

Price history for Gardenera Liquid Silica Boost on Amazon

True Organic Liquid Fertilizer for Watermelon

True Organic Liquid Tomato & Vegetable Food – Organic Fertilizer for Superior Harvests – 16 fl. oz. Bottle Covers 30 Sq. Ft.
Highlights
Boosts organic yields
Easy to use
Versatile application

When it comes to growing luscious watermelons, we can't overlook True Organic’s Liquid Tomato & Vegetable Food.

This powerhouse fertilizer brings the magic of organic yields to our gardens, thanks to its nutrient-rich formula and innovative soy protein hydrolysate.

Whether our plants are in the ground or cozy in containers, this versatile solution keeps them thriving, both indoors and out.

Plus, its easy-to-use mixing instructions make it a breeze: just add 2 oz. per gallon of water every two weeks.

While it does have a robust odor and requires frequent application, the generous coverage and outstanding results make it worth it.

Get ready for a watermelon harvest that will impress!

Be sure to also check out the best fertilizers for hydroponics for more options! Also, here is the price history so you know exactly when to buy!

Price history for True Organic on Amazon

FoxFarm Big Bloom

FoxFarm - Big Bloom Plant Food, Liquid Fertilizer Concentrate for Flowers, Fruits, and Vegetables, All Purpose Plant Fertilizer for Indoor & Outdoor Potted Plants, NPK 0.01-0.03-0.7 (Pint)
Highlights
Promotes vibrant blooms
Natural ingredients
Easy to apply

We’re excited to introduce you to FoxFarm Big Bloom Liquid Plant Food, a garden gem that's all about promoting vibrant blooms.

This liquid fertilizer is crafted with a unique micro-brewed formula featuring natural ingredients like earthworm castings and bat guano, ensuring your plants get a full spectrum of essential nutrients.

It's incredibly easy to apply—just mix it with water and watch as it nurtures your veggies, flowers, and herbs to their full potential.

While it may require frequent applications, the intensified fragrance and flavor it brings to your plants make it worth the effort.

Grab some and get ready for a bountiful harvest!

Be sure to also check out the best fertilizer for yews for more options! Also, here is the price history so you know exactly when to buy!

Price history for FoxFarm Big Bloom on Amazon

Miracle-Gro

Miracle-Gro Performance Organics Edibles Plant Nutrition - Organic Plant Food Feeds Instantly, for Tomatoes, Vegetables, Herbs and Fruits, Promotes a Bountiful Harvest, 1 lb.
Highlights
Instant plant food
Works for various plants
Covers large area

We're excited to share our thoughts on the Miracle-Gro Performance Organics Edibles Plant Nutrition!

This organic fertilizer is perfect for feeding your watermelons, tomatoes, and a variety of other garden favorites.

It offers instant nourishment to your plants, which we found truly helpful for faster growth.

While it covers a generous area of up to 265 sq. ft. when used with the Miracle-Gro feeder, we did notice it can be a bit tricky to dissolve and comes with a strong smell.

Remember to apply it every seven days for optimal results.

Overall, it's a great choice for a thriving garden!

Be sure to also check out the best fertilizer for snake plant for more options! Also, here is the price history so you know exactly when to buy!

Price history for Miracle-Gro on Amazon

Espoma Grow! Liquid Fertilizer for Watermelon

Espoma Organic Grow! Liquid Concentrate Plant Food - All Purpose Fertilizer for Indoor & Outdoor Plants. for Organic Gardening. 16oz Bottle Pack of one
Highlights
Contains organic ingredients
Improves plant growth noticeably
Easy to use and measure

When it comes to nurturing your watermelon plants, Espoma Organic Grow! truly stands out as a top contender.

We love that this liquid fertilizer is packed with natural proteins, enriched with kelp extracts and humic acids.

The 2-2-2 analysis ensures balanced nutrition, making it easy to see noticeable growth in your plants.

Although the strong smell might not win any awards, the results certainly do!

It's straightforward to use—just mix, water, and let nature do its magic every 2-4 weeks.

Plus, with its organic certification, it’s a wonderful choice for eco-conscious gardeners.

For lush watermelons, we highly recommend Grow!

Be sure to also check out the best fertilizer for passion fruit for more options! Also, here is the price history so you know exactly when to buy!

Price history for Espoma Grow! on Amazon

True Organic

True Organic All Purpose Liquid Plant Food - Liquid Fertilizer 16oz - CDFA, OMRI Listed for Organic Gardening NPK 3-2-2
Highlights
100% organic ingredients
Easy to apply
Visible plant improvement

When it comes to nurturing your watermelon plants, True Organic All Purpose Liquid Plant Food makes quite the splash!

We absolutely love that it’s made with 100% organic ingredients, ensuring your garden remains safe and environmentally friendly.

With just a 2 oz mix per gallon of water every two weeks, we’ve seen remarkable results – think vibrant, healthy plants thriving in a 30 sq ft area!

Admittedly, the smell can be a bit off-putting, and dissolving takes some patience, but the visible improvement in growth makes it worthwhile.

If you’re aiming for a bountiful watermelon harvest, this fertilizer is definitely worth a try!

Be sure to also check out the best fertilizer for jasmine plant for more options! Also, here is the price history so you know exactly when to buy!

Price history for True Organic on Amazon

TPS Nutrients

Water Plant Fertilizer, Complete Liquid Water Plant Food, 8 oz (250mL)
Highlights
Promotes healthy growth
Vibrant foliage
Easy care instructions

We’re excited to share our thoughts on TPS Nutrients Complete Fertilizer for watermelons!

This American-made gem is designed to ensure your watermelon plants flourish with healthy growth and vibrant foliage.

The easy-to-follow care instructions make it a breeze for both seasoned gardeners and newbies alike.

While it’s a newer entrant in the market, its promising formulation is worth a shot, even though it currently only comes in one size and has limited reviews.

If you’re aiming for a bountiful watermelon harvest, this liquid fertilizer might just be your ideal companion!

Be sure to also check out the best fertilizer for ginger plant for more options! Also, here is the price history so you know exactly when to buy!

Price history for TPS Nutrients on Amazon

EZ-GRO Fertilizer Liquid Fertilizer for Watermelon

EZ-GRO 20 20 20 All Purpose Fertilizer - All Purpose Liquid Plant Food - Lawn, Flowers, Herbs, Vegetables - Best Way to Grow Healthy Plants - Garden-Growing Miracle Nutrients - 1 Qt / 32 fl oz
Highlights
Balanced nutrition for all plants
Fast-acting liquid formula
Strengthens root and leaf development

When it comes to achieving a bountiful watermelon harvest, we wholeheartedly recommend the EZ-gro 20-20-20 Liquid Fertilizer.

This all-purpose formula is perfect for anyone seeking balanced nutrition for their plants, thanks to its fast-acting liquid blend.

With a simple mix-and-apply process, you'll see results in no time—ideal for both novice and seasoned gardeners.

While we love how it strengthens root and leaf development, ensuring your watermelons grow strong and healthy, we caution you to be mindful of measuring to avoid any burning.

Nevertheless, this fertilizer is a fantastic choice for luscious gardens!

Be sure to also check out the best fertilizer for willow trees for more options! Also, here is the price history so you know exactly when to buy!

Price history for EZ-GRO Fertilizer on Amazon

Bonide Plant Food

Bonide Houseplant Liquid Plant Food 10-10-10, 8 oz Concentrated Fertilizer for Indoors, Use Every Time You Water
Highlights
Promotes healthy growth
Consistent nutrient delivery
Easy to use

When it comes to nurturing your watermelon plants, Bonide Liquid Plant Food is a contender you won't want to miss! Specifically designed for houseplants, this liquid fertilizer delivers a balanced 10-10-10 nutrient profile, ensuring your watermelons receive optimal support for healthy growth.

It’s simple to use; just mix 1/8 tsp with a quart of water during your regular watering routine, making feeding a breeze.

However, do keep in mind a few hiccups, like possible nozzle clogging and the occasional shipping issue.

Still, with over 1,300 glowing reviews, this little bottle packs a punch for your garden!

Be sure to also check out the best fertilizer for mango trees for more options! Also, here is the price history so you know exactly when to buy!

Price history for Bonide Plant Food on Amazon

Farmer's Secret Fruit Tree Booster

Fruit Tree Booster Fertilizer (32oz) - Super Concentrated and Phosphorus Rich - Formulated for All Fruit Trees Including Peach, Banana, and Apple
Highlights
Super concentrated formula
Boosts fruit production
Supports critical growth phases

When it comes to nurturing your watermelon plants, Farmer's Secret Liquid Fertilizer is a game-changer!

This super concentrated formula is specifically crafted for those vital early growth stages, ensuring that your fruits are not just healthy, but also producing abundantly.

It’s amazing how a mere teaspoon diluted in water can transform your garden routine—just one gallon will go a long way!

However, we’d advise caution to avoid over-fertilization.

While there are minor durability concerns with the bottle, the benefits of increased fruit production truly shine through. Dive into the secret of a fertile garden with this excellent choice!

Be sure to also check out the best fertilizer for maple trees for more options! Also, here is the price history so you know exactly when to buy!

Price history for Farmer's Secret Fruit Tree Booster on Amazon

TPS Nutrients Palm Fertilizer Liquid Fertilizer for Watermelon

TPS NUTRIENTS Palm Tree Fertilizer for All Palms and Ferns, Liquid Plant Food, 32 oz (1 Quart)
Highlights
Easy to mix
Nutrient-rich formula
Ideal for all palms

We’ve found the ultimate solution for nurturing your palm trees with the TPS Nutrients Liquid Palm Tree Fertilizer.

Mixing is a breeze—just 2 tablespoons per gallon of water and you’re set!

This nutrient-rich formula not only promotes robust root development but also revitalizes those gorgeous fronds, ensuring your palms thrive both indoors and outdoors.

While it’s generally effective, keep in mind that it may not work for every variety and requires thoughtful application.

Still, for a convenient year-round solution, this fertilizer effortlessly fits into our garden routine.

Get ready for vibrant growth and health!

Be sure to also check out the best fertilizer for redbud trees for more options! Also, here is the price history so you know exactly when to buy!

Price history for TPS Nutrients Palm Fertilizer on Amazon

FoxFarm Soil Trio

FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint)
Highlights
Complete Nutrient System
Noticeable Plant Growth
Easy to Mix & Use

When it comes to nurturing our watermelons, we’ve found that FoxFarm’s trio of liquid fertilizers—Big Bloom, Grow Big, and Tiger Bloom—are our best friends in the garden!

This complete nutrient system works wonders, promoting lush vegetative growth and bountiful fruit production.

While the strong smell might take some getting used to, the easy mix and application make it a breeze to use every time we water.

Just remember to follow the proper dosing for the best results.

With an impressive 4.7-star rating from fellow gardeners, it’s clear that this powerhouse trio has earned its place in our gardening toolbox!

Be sure to also check out the best fertilizer for root vegetables for more options! Also, here is the price history so you know exactly when to buy!

Price history for FoxFarm Soil Trio on Amazon

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