Top 10 Best Fertilizers for Watermelon | 2020 Reviews

Watermelon is a delicious and refreshing fruit to eat, especially during the hot summer season. It is nice to eat a watermelon that you have planted yourself in your yard or garden. If you plant your watermelon plant inside your garden, you no longer need to go through the hassle of going out to find and buy a watermelon fruit in your local grocery. You may not have a green thumb like other people, but you can still grow your watermelon plant.

You have to properly take care of your watermelon plant for it to taste good, delicious, and for it to grow in full size. In this review, you will know the different fertilizers from different brands and what these products can offer for your watermelon plants. Listed down below are the ten best fertilizers for a watermelon that can help you grow your plant:

Top 10 Best Fertilizers for Watermelon Reviewed

  1. Smart-Release Plant Food Flower & Vegetable by Osmocote – Best Overall
  2. Continuous Release Plant Food by Miracle Gro – Best Value
  3. Performance Organics Edibles Plant Nutrition by Miracle Gro – Editor’s Choice
  4. Organic Gardening Tomato & Vegetable Plant Food by EcoScraps
  5. Jack's Classic by JR Peters
  6. Organic Tomato & Vegetable Plant Food Fertilizer by The Old Farmer's Almanac
  7. Premium Gold All Purpose Fertilizer by Dr. Earth
  8. Organic Tomato and Vegetable Granular Plant Food by Burpee
  9. All Purpose Planting And Growing Food by Lilly Miller
  10. Organic All Purpose Granular Fertilizer by Jobe's Organics

#1. Smart-Release Plant Food Flower & Vegetable by Osmocote – Best Overall

Smart-Release Plant Food Flower & Vegetable by Osmocote

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Product Specification:

  • Weight: 8.1 pounds
  • Sizes Available: 1 pound, 2 pounds, 4.5 pounds, and 8 pounds
  • Product Variant: Flower & Vegetable, Outdoor & Indoor

You can use Smart-Release Plant Food Flower & Vegetable by Osmocote as a fertilizer in every stage of your watermelon plant life cycle. This fertilizer’s granule is coated with a semi-permeable resin feature, allowing water to enter the granule to dissolve the nutrients. Nutrients such as nitrogen, phosphorus, and potassium are present in every granule that will help develop the watermelon plant. The release of these nutrients depends on its environment’s weather condition; more nutrients can be released during warmer days. You can apply the fertilizer granules on your plant’s soil, but don’t let it touch the watermelon plant; after that, you have to make sure that the plant is thoroughly watered.

ProsCons
Fertilizer has a slow-release of nutrients, and it does not burn the plantsContains microplastic shells
Contains high nutrients that will help your watermelon plant growHas an expensive price
Improves growth development of your watermelon plant
Can be used as fertilizer for up to four months

#2. Continuous Release Plant Food by Miracle Gro – Best Value

Continuous Release Plant Food by Miracle Gro

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Product Specification:

  • Weight: 4.93 pounds
  • Sizes Available: 1 pounds and 4.5 pounds
  • Product Variant: Tomato, Fruits & Vegetable, Rose & Bloom, All Purpose, All Purpose + Weed Preventer, Palm, Citrus & Mango
  • Product Ingredients: Earthworm casting, feather meal, bone meal, kelp, and earthworm casting

Miracle Gro’s fertilizer product, the Continuous Release Plant Food, is a good choice to help you boost your watermelon plant’s growth. This fertilizer was specially made and formulated for watermelon plants to enhance and strengthen its growth and make its color look more vibrant. This fertilizer’s granule contains microbes that will transform its natural components into nutrients for your plant once you apply it. The nutrients that this fertilizer gives can improve your watermelon plant’s root development and enhance its water efficiency. You can use this fertilizer for your watermelon plants for up to three months by simply applying it to the ground, mixing it with the soil up to three inches, and watering it afterward.

ProsCons
Has a micronutrient formula for a stronger plant and for it to be able to produce fruitsCan be a dangerous substance for your pets
Can help you avoid discoloration in your watermelon plot due to calcium deficiencyPoor delivery of the product
Made from natural ingredients that will be able to feed microbes in your plant's soil
You can use the fertilizer for up to three months

#3. Performance Organics Edibles Plant Nutrition by Miracle Gro – Editor’s Choice

Performance Organics Edibles Plant Nutrition by Miracle Gro

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Product Specification:

  • Weight: 1.15 pounds
  • Product Variants: Edibles, All Purpose, and Bold Blossom
  • Formulation of Ingredients: 9-4-12
  • Application Period: Every seven days

Another fertilizer product by Miracle-Gro is the Performance Organics Edibles Plant Nutrition. This fertilizer product is made from aged compost mixed with other organic ingredients that you can use to grow your watermelon plants and other edible plants. This product is listed under OMRI to ensure that it has 100% organic ingredients if you want to grow your watermelon plants organically. This fertilizer contains nutrients like nitrogen, phosphorus, and potassium with a formulation of a 9-4-12 that can help you fertilize up to 265 square feet of your garden in just one container. You can apply this fertilizer by mixing two scoops of the product in every one gallon of water every seven days to let the nutrients soak in the soil absorbed by the watermelon’s roots.

ProsCons
Made from organic ingredients that are mixed with aged compost to enhance growthCan be challenging to dilute the fertilizer in the water completely
Can instantly feed your watermelon plants by dissolving the fertilizer to waterFertilizer product is smaller than what was advertised
Listed under OMRI for being an organic food fertilizer
Fertilizer can cover up to 265 square feet area

#4. Organic Gardening Tomato & Vegetable Plant Food by EcoScraps

Organic Gardening Tomato & Vegetable Plant Food by EcoScraps

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Product Specification:

  • Weight: 4.19 pounds
  • Product Variant: Tomato, Herb and Vegetable, All Purpose, Azalea, Camellia and Rhododendron, Citrus and Avocado, Berry, Rose and Flower, and Leafy Green
  • Product Ingredients: Bone meal, blood meal, calcitic lime, compost and sulfate of potash
  • Product Component: 6% Soluble Potash, 4% Available Phosphate, 5% Nitrogen, 5% Water Insoluble Nitrogen, and 1% Calcium
  • Application Period: Every month

The Organic Gardening Tomato & Vegetable Plant Food by EcoScraps contains different nutrients that will help grow your watermelon plant. This fertilizer product is eco-friendly and recycled leftovers from the food processing industry to create organic fertilizer for your plant while helping the earth at the same time. This product has different variants depending on which fertilizer you need for your gardening, and each particle of this fertilizer contains the nutrients your plant needs. You can apply this fertilizer to your watermelon plant by mixing it into the surface of your plant’s soil and watering it afterward. One pound of this fertilizer can cover up to 50 square feet of area in your garden.

ProsCons
An environmentally friendly product that helps in reducing landfill waste through recyclingFertilizer has an unpleasant odor
Made from recycled food leftovers from the food processing industryCan be harmful to your pets
Clean and does not include manure on its fertilizer ingredients
Can provide you the support that you need for your gardening

#5. Jack's Classic by JR Peters

Jack's Classic by JR Peters

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Product Specification:

  • Weight: 1.5 pounds
  • Available Product Bundle: Two Pack, Three Pack, and Four Pack

The Jack’s Classic by JR Peters is a water-soluble fertilizer that you can use in feeding your watermelon plant. This fertilizer is filled with different micronutrients that will help in enhancing the life of your watermelon plant. You have to mix the fertilizer with water based on the instructions written to absorb the various nutrients it provides. This fertilizer’s potassium level is higher to help the plant produce more watermelon fruit and make its leaves more vibrant. This product comes with a measuring spoon inside its package to help you precisely measure the fertilizer when applying it to the plant.

ProsCons
Specifically made with nutrients that are helpful for fruiting vine type of plantsPoor handling of the product upon delivery
Can strengthen the vines of your plant and can make its leaves greenerHas an expensive price
Includes a measuring spoon side the fertilizer package
Fertilizer contains high potassium component

#6. Organic Tomato & Vegetable Plant Food Fertilizer by The Old Farmer's Almanac

Organic Tomato & Vegetable Plant Food Fertilizer by The Old Farmer's Almanac

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Product Specification:

  • Weight: 2.25 pounds
  • Product Ingredients: Feather meal, bone meal, blood mean, soybean, potash, and sulfate
  • Product Components: 8% nitrogen, 4% phosphorus, and 8% potassium
  • Formulation of Ingredients: 8-4-8

Another organic fertilizer product listed under OMRI is the Organic Tomato & Vegetable Plant Food Fertilizer by The Old Farmer’s Almanac. This fertilizer contains different nutrients from organic ingredients that you can use for indoor and outdoor gardening. You can apply this fertilizer once you’re planting your watermelon plant by mixing 2.5 cups of this fertilizer per 100 square meters that you want to cover. This fertilizer can help enhance the growth of the watermelon and its fruits and color, and it also promotes strengthening the roots of your plant. Once the watermelon plant starts to grow, you can apply the fertilizer every six to eight weeks for the best results.

ProsCons
Listed under OMRI certifying you that this fertilizer is made from organic componentsFertilizer has a bad odor
Contains protein that has high-quality content that is not mixed with manureCan form molds
Package has a resealable bag for easy opening and closing of your fertilizer
Capable of handling up to 250 square feet area of your garden

#7. Premium Gold All Purpose Fertilizer by Dr. Earth

Premium Gold All Purpose Fertilizer by Dr. Earth

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Product Specification:

  • Weight: 12 pounds
  • Sizes Available: 1 pound, 4 pounds, 12 pounds, and 25 pounds
  • Product Component: Protein, carbohydrates, multi-minerals, trace elements, and humic acid

If you are looking for a fertilizer product that is safe to use for pets and also people, you can choose the Premium Gold All Purpose Fertilizer by Dr. Earth. This fertilizer is a good supplement to use while growing your watermelon plant until it reaches its maturity. It is specifically made to help you organically grow your plant while still providing all the nutrients that it needs. This fertilizer can improve your soil’s quality, and it can help nourish the roots of your watermelon plant. Using this product will help your watermelon grow its vines and make its fruit full and rich.

ProsCons
Can help in growing your watermelon with the proper nutrients it can give to your plantThe expiration date of the fertilizer was missing from the product label
Contains organic and non-toxic ingredients that are safe for both pets and humansFertilizer has an unpleasant smell
Environmental and can provide healthy growth for your watermelon plant
Certified under non-GMO project fertilizer

#8. Organic Tomato and Vegetable Granular Plant Food by Burpee

Organic Tomato and Vegetable Granular Plant Food by Burpee

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Product Specification:

  • Weight: 4 pounds
  • Available Product Bundle: 2 pack and 3 pack

If you want to boost your watermelon plant’s growth and health, you can choose this product by Burpee called the Organic Tomato and Vegetable Granular Plant Food. This fertilizer contains nutrients that can improve your plant’s root development, and it has microorganisms that will be beneficial for your watermelon. This product can also improve the soil where your watermelon is planted and provide your plant with a stream of nutrients for up to three months. This product is ideal to use as a supplement for your garden, seed starting, young bedding plants, or patio potted watermelon plants. Using Burpee’s fertilizer product can give long-lasting results to your plants.

ProsCons
Has microbes and proper nutrients that are beneficial for your watermelon plantThe package was already used when the product was delivered
You can quickly feed your watermelon plants and can provide you good resultThe product received was already expired
Provides your watermelon plant all the essential nutrients that it needs
Listed under OMRI for being an organic fertilizer product

#9. All Purpose Planting And Growing Food by Lilly Miller

All Purpose Planting And Growing Food by Lilly Miller

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Product Specification:

  • Weight: 1 pound
  • Formulation of Ingredients: 10-10-10

You can choose the All-Purpose Planting And Growing Food by Lilly Miller if you want your watermelon plant to have a good start. This fertilizer has a 10-10-10 formulation for its phosphorus, potassium, and nitrogen component was acquired from four different sources. This fertilizer contains different nutrients and minerals that will be helpful in the growth of your watermelon plant. This slow-release type of fertilizer can make your plant have steady growth, lush leaves, and productive watermelon fruit. You can use this fertilizer product not just on fruits but also on vegetables.

ProsCons
Slow-release type of fertilizer for the steady growth of your watermelon plantLimited reviews from previous customers
Fertilizer is very easy to use both for in-ground and potted plants
Can make the leaves of your watermelon plant greener
Contains fast-acting components

#10. Organic All Purpose Granular Fertilizer by Jobe's Organics

Organic All Purpose Granular Fertilizer by Jobe's Organics

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Product Specification:

  • Weight: 8.79 pounds
  • Ingredients Formulation: 4-4-4
  • Product Component: Nitrogen, phosphorus, potassium, sulfur, calcium, and magnesium
  • Product Ingredients: Bone meal, feather meal, and sulfate of potash

If you want an all-around fertilizer that you can use for your garden, you will like this Organic All Purpose Granular Fertilizer by Jobe’s Organics. This fertilizer product is packed with different nutrients from organic ingredients to boost your watermelon plant’s growth. This product can enhance the soil condition of the ground to help your plant withstanding disease. It also helps in making your plant survive drought, especially during its growing season. This fertilizer product is ideal to use not just on your watermelon plant but also on your vegetables, trees, shrubs, etc.

ProsCons
You can easily use this fertilizer by simply applying it to the soil of your plantCan attract pest
Can cover an additional 20% square feet compared with other products
Has a biozome that can increase your plant's microorganism activity
Can give your watermelon plant the nutrition that it needs

Top Pick Section

The best fertilizer product to use for your watermelon plant that this review recommends is the Smart-Release Plant Food Flower & Vegetable by Osmocote. This product contains the necessary nutrients your watermelon plant needs to enhance it’s quality and growth development. With this product, you can also choose the right quantity that you need for your gardening since it offers different sizes to choose from. This brand also offers different product variants depending on your need to choose a certain fertilizer specially made for your watermelon plant. This fertilizer product can make the production of your watermelon plant tasty and juicier so you can enjoy the fruit you have planted yourself.


Best of Fertilizer for Watermelon Brands

You now know the different fertilizer products that can be used for your watermelon plant. This section will provide you with additional knowledge about the other factors that will help enhance watermelon growth.

1. Compost

If possible, try to add compost as an addition to the soil where your watermelon is planted. Compost will keep the soil in your garden have good moisture for a long period, which can help improve its soil structure. Watermelon prefers to grow in a type of soil that is fertile, has moisture, and offers good drainage. You can put four inches of compost for its layer and mix it with six inches for its upper soil.

2. Mulch

Mulch is a good soil additive if you want to conserve the soil’s moisture for a long period. With the help of mulch, it can stop the growth of weed in your soil and retain its moisture. You can use grass clippings, weed-free straw, and even shredded newspaper for your mulch. You can simply apply the mulch and maintain its layer on the surface of your soil.

3. Watering

As you water your watermelon, keep in mind that you must avoid watering the plant itself. You also need to avoid overwatering it since this may lead to your plant’s collapse because it lacks oxygen. You can first check the moisture of your plant’s soil to help you avoid overwatering it.


What to Consider When Buying Fertilizer for Watermelon – Buyer’s Guide

When buying a product that will help you with your gardening, you want to purchase the right product worth the money you have spent. List down below are some guidelines and things that you can consider that will help you choose the right fertilizer for your watermelon:

1. Price of Fertilizer

Considering the price of a fertilizer product, you must evaluate factors such as the size and area you will use it for and how often you need to apply the fertilizer. In this way, you will know the quantity of fertilizer you need to buy to avoid wasting money on buying too much fertilizer or buying another batch of fertilizer products. Buying the right amount for your garden will save you time and the effort to go to the store or the hassle of buying online.

2. Fertilizer Variant

It is ideal to find a fertilizer brand that offers different product varieties specializing in a certain plant type. It is recommended to try finding a fertilizer intended for watermelon plants because these fertilizer types will provide the right nutrients that your watermelon needs. Applying a fertilizer that contains the right formula for your watermelon plant will enhance its growth and fruit productivity.

3. Fertilizer Ingredients

List down below are some common ingredients you can find in an organic fertilizer:

  • Plant-Based

The advantage of using a plant-based fertilizer is that it easily breaks down, and it has a lesser smell than other fertilizers. Plant-based fertilizers are also ideal in helping you condition the soil where your watermelon is planted. It can improve the soil’s moisture retention and enhance its quality. The following are some of the plant-based ingredients that you will find in the market: molasses, alfalfa meal, kelp seaweed, compost tea, cottonseed meal, etc.

  • Animal Based

Animal-based fertilizers are mostly made from the manure of animals, blood, and bone meal. These ingredients for organic fertilizers are recommended to use, especially for leafy plants, since they can add a lot of nitrogen. However, animal-based fertilizers can have an unpleasant smell.

  • Mineral Based

Fertilizers with a mineral-based for its ingredients can provide your plant with the necessary nutrients that it needs. Mineral-based can also reduce the pH level, and some of the examples of these minerals are Epsom salt and calcium.

  • Worm Casting

Based on its name, this type of organic fertilizer ingredient came from earthworms. Worm casting is the waste of earthworms that is also called vermicast.  Earthworms consume the compost, and the waste that they release can turn the soil into a fertile type. Worm casting has small and ball-shaped particles, and it can provide your soil aeration, increase soil retention, and better drainage. If you buy a fertilizer with worm casting, ensure that it is not dry, saturated, stinky, and crumbly.

4. Ratio of Fertilizer

For watermelon plants, it needs to acquire both micronutrients and macronutrients.  Phosphorus, nitrogen, and potassium are the main macronutrients a watermelon plant must have for it to be able to grow. The recommended fertilizer ratio for watermelon is for it to have higher nitrogen, especially during the plant’s early growth stage. Phosphorus and potassium are responsible for increasing the production of a watermelon plant. You may apply an NPK with a formulation ratio of 1-1-1, a 5-5-5, 10-10-10, or 14-14-14.

However, applying a high nitrogen type of fertilizer once the watermelon develops can lead to its foliage’s growth than the development of the watermelon.

5. Nutrient Release

Water-soluble types of fertilizer can work faster than other types of fertilizers. However, if you apply a large quantity of it, it can lead to a chemical burn, drying out your plant by siping all of its water content. On the other hand, a slow-release type of fertilizer will not cause any burn to your plant, and you don’t have to apply the fertilizer constantly. Slow-release type of fertilizers can provide you long-term advantages.


Conclusion

In conclusion, having fertilizer will greatly help you achieve the growth that you want for your watermelon plant. Your plant will benefit from the nutrients it gives, and you will also get to enjoy the taste of its produced watermelon fruit. This review contains the guidelines you need to buy the right fertilizer for your plant, or you can also choose from the product list discussed. If you will buy fertilizer for your watermelon plant, this review recommends the Smart-Release Plant Food Flower & Vegetable by Osmocote. With this product’s help, you will like your watermelon gardening experience and happily enjoy the taste of its watermelon fruit.


Frequently Asked Questions – FAQs

What is the reason why do watermelon plants die?

There could be a fungal problem on the soil if a watermelon plant dies. You can pull out the watermelon plant and look for discoloration on its roots or its base. If you found a fungal problem, you can use a fungicide product as a solution to remove these fungi.

How often should you apply fertilizer to your watermelon plant?

You can apply a liquid or water-soluble fertilizer to your watermelon every once a week. While your watermelon plant is still in its growing stage, you can apply a fertilizer that has high nitrogen. You may use a fertilizer that has an NPK 20-10-20 formulation. Once the plant has produced its flower, the fertilizer you should use is a balanced fertilizer with a 20-20-20 formulation.

Is it possible to increase the size of your watermelon fruit?

You can increase the size of your watermelon fruit if you always make sure that its soil has good moisture by regularly checking if it needs watering. You may also apply fertilizer as a supplement to enhance its growth and for larger watermelon produce.

What does it mean when the leaves of your watermelon plant turned yellow?

Causing of yellowing in the leaves of your watermelon could be due to overwatering. It means that the plant has a hard time absorbing the nutrients that it needs since overwatering can wash out the nitrogen on the soil. You can stick your finger to the watermelon plant’s soil to check its moisture and if it needs watering.

What is the ideal season to plant a watermelon?

You can start planting your watermelon seed once the winter season has passed. You can plant it during the spring season. Before planting your watermen seed in your garden, keep in mind that you must place the watermelon seeds indoors first for up to twenty days.

 

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