Best Bloom Booster Review — Organic and Natural Soil Fertilizers to Boost Flower, Bloom and Blossom Growth

Some bloom boosters are dry and water soluble while others are liquid-based. On the other hand, some bloom boosters are organic, and others are inorganic, with each having its own pros and cons. We have researched five of the best bloom booster brands in the market, showcasing a fertilizer from each to help you find one that best meets your gardening needs.

When it came to choosing our top 5, we did out best to choose a variety of types, because everyone’s needs are different. This meant that we didn’t have room for some other really great organic bloom boosters for soil. So, if the products we reviewed are not what you were looking for, we went ahead and researched a few other quality organic fertilizers to boost your blooms and blossoms!

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Nutrient Ratio
Our Top Choice
Fox Farm Liquid Nutrient Trio Soil Formula
Fox Farm is a reputable, family-owned business with a focus on manufacturing high quality garden products such as dry and liquid fertilizers, soil conditioners, etc.
Fox Farm is a well-known brand, and the fertilizer comes in a complete bloom booster package with great ratings on Amazon. It’s a perfect choice for late-season fruits and flowers.
The cost of this 3-pack liquid fertilizer is relatively high.
Liquid nutrient
3-pack/32 oz each
Twice every week
Grow Big 6-4-4;Tiger Bloom 2-8-4
Best Value
JR Peters Classic Blossom Booster
JR Peters Inc., established in 1947, is a brand that manufactures fertilizers for specialty agriculture, horticulture and retail markets.
The fertilizer is rich in phosphorous, usable during transplanting due to fast nutrient absorption and ideal for indoor/outdoor use to boost flowering in plants.
The fertilizer isn’t organic, hence excessive application can kill plants and microorganisms living in soil.
Water soluble for flowers
1.5/4/8 Pounds
Every 7 to 14 days
Advanced Nutrients Bud Candy Bloom Booster
Advanced Nutrients is a popular brand that manufactures highly nutritious and superior hydroponics fertilizer for improved plant taste and growth.
Advanced Nutrients is a renowned brand. The fertilizer comes in larger packages, is organic and the best choice for a long-lasting organic bloom booster for commercial use.
The fertilizer is costly.
Liquid plant sweetener fertilizer
23 liters
1 to 6 weeks during flowering
Not Specified
General Hydroponics KoolBloom Fertilizer
For over 40 years, General Hydroponics has been an innovative brand that uses modern research and manufacturing processes to enhance the quality of agriculture.
Kool Bloom has good pricing, is available in 4 sizes and focuses on early transition stage from vegetative to flowering. It promotes faster ripening and enhanced flower density.
The fertilizer isn’t ideal for large scale use.
Liquid fertilizer
1 quart/0.95 liters
Based on normal watering schedule
Miracle-Gro® Water Soluble Bloom Booster
Miracle-Gro is part of the ScottsMiracle-Gro brands that offer various products for gardening, lawn care and home protection amongst them being pest and weed control solutions.
The fertilizer can be used both indoors and outdoors, it’s easy to administer and retails at an affordable cost.
None has been reported by users.
Water soluble fertilizer
4 pounds/1.8 liters
Every 2 weeks/7 to 14 days

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What is the Best Bloom Booster for Your Soil?

Nutrient-rich bloom boosters guarantee that your plants will get all the foods they need to grow healthily for optimal results. A good plant booster coverage and type ensure that even the roots of your plants gain access to the nutrients, and you choose an application mode based on the type of fertilizer. Your choice of a plant growth booster should also come in the right quantity to cater to all your plants. Before we get to our featured brands, we want to give a shout out to Dr. Earth who has a complete line of organic fertilizers, plant foods and bloom boosters. We simply didn't have room for six!

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Our Top Choice
Fox Farm Trio Soil Formula is meant to bring your plants to life through consistent cycling of nutrients and healing root systems for better plant support. Don't need all three? Fox Farm Big Bloom comes in a single liquid bloom booster pack. Opt for this organic bloom booster if you want to increase nutrient cycling and heal the roots of your plants.

Fox Farm Liquid Nutrient Trio Soil Formula: Includes Organic Big Bloom Booster Fertilizer, Grow Big Plant Food & Tiger Bloom Fertilizer


Fox Farm Trio Soil Formula is used all season long to obtain luscious fruits and maximum blooms. The Big Bloom fertilizer is perfect for your late-season mature fruits and flowers. There’s no better way to bring your plants to life than by using these organic fertilizers. Fox Farm offers not just high quality gardening products, but also superior customer service. Its organic fertilizers are aimed at creating a naturally attractive Earth.

First apply Grow Big Hydro to boost green growth in your plants. It facilitates compact, vegetative and lush growth in plants. The moment your plants begin budding, apply Tiger Bloom to facilitate bud development. It’s fast-acting, ultra-potent and rich in phosphorous. Boost your nutrient cycling and heal the roots of your plants using the Big Bloom liquid fertilizer. It’s ideal for use throughout your growing season.

Oh, and by the way the Big Bloom® Liquid Plant Food is formulated for use on all plants and can be used every time you water. And what's even better it is made from OMRI Listed® and Registered CDFA Organic Input Material.

Best Value
JR Peters Blossom Booster is a professional formula for all your indoor and outdoor flowering plants. The traditional bloom booster fertilizer is perfect for brightening both your interior spaces and outdoors with natural colors. Growing orchids? JR Peters' Classic Liquid Orchid Bloom Booster is blended with an enhanced micronutrient package which provides optimal nutrition for strong roots and green foliage

JR Peters Jacks Classic No.4 Blossom Booster Fertilizer – 10-30-20 Water Soluble Plant Food for Bigger Blooms


Designed to unleash nutrients slowly within 16 weeks, your plants are bound to enjoy vigorous growth. Brighten your home both on the inside and outside with beautiful, colorful flowers by applying this professional plant formula. Other than guaranteed proven quality and nutrient ratio, your plants can absorb the nutrients either through their leaves or rooting systems.

Whether you’re tending to vegetables, fruits or flowering plants such as marigolds and impatiens, this formula is a good choice. What’s more, JR Peters has been in the industry for more than 63 years, long enough to know what you want for your plants. Moreover, the firm is run by gardeners.

Available in 3 sizes (1.5, 4 and 8 pounds), JR Peters Blossom Booster comes with a free measuring spoon for easy and accurate fertilizer application. When you use this fertilizer as directed by the manufacturer, its safety factor protects you from burning. The fertilizer is rich in micronutrients to give your plants maximum nutrition. This ensures that your plants develop green foliage and strong, healthy roots.

Advanced Nutrients Bud Candy can help you improve flower production for larger flowers with stronger sweetened aromas, brighter colors and increased resins. Your plants also get to enjoy improved immunity. Need fertilizer to cover the multiple needs of your plants and flowers? Consider the Advanced Nutrients Bloom, Micro and Grow three pack to to ensure their plants get the maximum amount of nutrients!

Advanced Nutrients Bud Candy Soil Fertilizer - Bloom Booster for Larger Flowers, Stronger Roots And Faster Floral Maturation


Available in 7 sizes (.250, .5, .95, 1, 4, 10 and 23 liters), the Advanced Nutrients Bud Candy is what you need to ensure your plants have more resins, a better aroma and taste and blossoming large flowers. Your plants also get improved floral growth, stronger rooting systems and strong immunity.

The fertilizer exploits your plants’ genetic potential, energizing them for maximum growth. Advanced Nutrients understands that you need your plants to grow fast and produce high yields, hence the manufacture of fertilizers to realize just that.

Manufactured for root absorption, Bud Candy is rich in amino acids, carbohydrates and vitamins your plants need. Whether you’re a horticulture farmer or simply tending to your garden, this fertilizer will come in handy to ensure you obtain maximum yields.

General Hydroponics Kool Bloom is a liquid fertilizer aimed at improved flowering, better ripening of fruits and enhanced fragrances and essential oils production. It’s the formula your plants need for large weighty fruits and flowers and enhanced potency. Want more than just a bloom booster? The General Hydroponics Flora Grow, Bloom, Micro Combo Fertilizer Set contains omplete Primary, Secondary and Micro Nutrients for enhanced yields and better crop quality.

General Hydroponics Liquid Kool Bloom Fertilizers – Encourages Abundant Flowering, Available in 4 Sizes


General Hydroponics Kool Bloom gives your plants the health and robustness they need to keep flowering year-in, year-out. Sweeten your garden of fruit trees and heighten their bloom size. Fortified with various nutrients such as potassium and phosphorous, this is the fertilizer your plants need to give optimal yields.

General Hydroponics has a team of engineers, scientists and researchers who work in its modern facilities to come up with products and solutions that won’t just foster the growth of your plants, but ensure that you get high yields year after year. The nutritious transporting acids and vitamins (with stress-reducing abilities) in the fertilizer impart great flavors and unique aromas while boosting essential oil production.

Your plants also benefit from improved flower development and fruiting. For optimal results, apply the liquid bloom booster at the beginning of the reproductive cycle to foster the development of heavier fruits and larger flowers. Facilitate ripening and bolster bloom boost by applying dry Kool Bloom within the last couple of weeks in the reproductive cycle.

Miracle-Gro Flower Food is a unique fertilizer rich in phosphorous for fast-action, increased bloom yield and improved color. It’s ideal for your perennials and annuals planted in window boxes, containers, etc. We are exited to let you know that Miracle-Gro also offers organically formulated bloom boosters too. Take a look at Miracle-Gro Performance Organics Blooms Plant Nutrition Granules!

Miracle-Gro® Water Soluble Bloom Booster® Flower Food Refill – Specially Formulated for More Abundant and Colorful Flowers


Whether your perennials or annuals are in window boxes, containers, etc., this fertilizer works just fine. It’s the key to attaining blooming and colorful yields all-year round. Miracle-Gro is a household name in home gardening and a brand popular for its range of fertilizers that have proven effective. What’s more, the brand has been in the market for years, hence trusted.

Miracle-Gro Flower Food fertilizer has a double feeding action (via leaves and roots) for fast plant development and improved blooms. Designed for instant action, the fertilizer is safe when used properly during applications and produces quick results. This means you’re safe from the risk of getting burned. Your plants are also safe from getting killed.

This particular product is water solubable granules, but Miracle Gro also offers LiquaFeed Bloom Booster Flower Food if you prefer to pour your bloom booster fertilizer directly into the soil.

How to Choose the Best Bloom Booster For Your Vegetables and Plants

Bloom boosters are familiar to farmers, gardeners or anyone else with a special interest in plant production. Bloom boosters, much like lawn fertilizers, are nutrient-rich to enhance crops, thereby promoting flowering and the growth of strong plants with greater yields.

Technology has changed the way the world operates. Even with advances in technology, the method of growing plants has remained the same. The nutrients in soil must be replenished to keep your farm or garden productive.

Bloom boosters are packed with plenty of phosphorous and potassium to boost plant flowering and fruit development. Other essential elements incorporated in these fertilizers include amino acids, trace minerals and organic stimulants responsible for strengthening stems, roots and leaves while preventing weaknesses, deficiencies and diseases.

With the current world population, resources have decreased while food demands have tremendously increased. This has created a need for increased fruit, vegetable, and grain production to meet the growing demand. With bloom boosters, your garden or farm can double its production levels to meet the increased food demand.

Although nature has its ways of renewing the fertility of soil, the increased population comes with increasing human activities, pollution and environmental changes that hamper the renewing process, rendering it insignificant. Traditionally, land was left untilled for some seasons to renew and replenish. With high crop turnovers, soil is unable to replenish adequately, resulting in lower-nutrient foods.

Whether you have a small garden in your back yard or engage in large-scale, commercial food or flower production, if you desire a boost in the growth of plants in your flower garden then bloom boosters are crucial. You'll also want to consider getting a backpack sprayer to help apply the booster evenly and efficiently.

First decide whether you want liquid or water soluble bloom boosters and your preferred application method. This is a mixed review of different types of bloom boosters and we hope that this guide will help you make an informed decision.


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The prices of bloom boosters vary based on numerous factors. They’re highly influenced by brand type, element composition and percentages, solubility, packed quantities, and other essential factors such as government regulations. For $10 or less, you can get a 250ml bloom booster; these come in handy if you have a small garden or you’re working on a tight budget.

Powder bloom boosters are less expensive than their liquid variations. With $7-$15, you can get a 250g packet of bloom booster, which can be diluted with 200 gallons of water. Popular brands with high-end and highly effective bloom boosters have their products retailing at $100 or more for a one-liter bottle.

Note that larger quantities of bloom boosters retail at better prices. If you store them well, they can serve you for a longer period of time. Consider these types of bloom boosters if you’re involved in commercial gardening or grow your plants for a profit.


Bloom boosters offer plants the essential nutrients at the required stages in their development. With the right bloom booster used on your plants, you can expect an abundant harvest. With proper nutrient combination, a balance is created in the nutrition levels required for healthy plants. You need to know your plants and their nutritional needs to be able to pick the right bloom boosters for your plants.

Here are the important things to look for in bloom boosters:

  • Type such as flowering, PK and root boosters
  • The right quantity for all your plants
  • Bloom booster coverage to meet the size of your garden or farm
  • Application method and frequency of application
  • Nutrient ratio to meet your plants’ needs for essential nutrients

With the right bloom booster, your plants can grow faster and bloom as you expect for enhanced growth and production in fruits, food or flowers.

Construction and Design

Shopping around for the right bloom booster? Here are the important factors to consider before purchasing a bloom booster:

Type – The type of bloom booster you buy depends on your intended use and need. Do you need to boost your plants’ flowering, budding, stems, leaves or roots? Study the stages of your crops to know what you need at any given stage.

Flowering boosters stimulate the flowering process in plants when they’re at half-life to promote the development of quality and quantity of your flowers. The ratio of bloom booster components is aimed at increasing fruit development, which is a critical part of the flowering process.

PK boosters provide the required ratio of potassium and phosphorus, which are responsible for boosting the development of flowers and fruits. On the other hand, rooting boosters promote the development of roots to ensure strength and stability of plants. The right ratio or combination of components formulated in rooting boosters support the development of healthy roots, especially for root crops such as potatoes, arrowroots and cassavas.

Quantity – The right quantity of bloom boosters you need is directly proportional to the size of your garden or farm, or the number of plants you want to enhance their growth. Available in various quantities, opt for small quantities if you are a small-scale gardener or simply need to test a particular brand first before investing heavily in one.

It is economical to purchase bloom boosters in large quantities if you are a large scale gardener or you are sure of the particular brand.

Coverage – If you own large tracts of land, buy a bloom booster with a large coverage area. Know the size of your farm or garden to be able to choose the right coverage.

Application Method – Bloom boosters are either in liquid or powder form. Choose the form of bloom booster to buy depending on your intended application method and know how frequently any given product is recommended for application before buying one. Whichever brand you opt for, follow the manufacturer’s instructions and recommendations for the best results.

Nutrient Ratio – Bloom boosters are comprised of potassium, phosphorus, magnesium, amino acids and other nutrients suitable for crop production. Since different plants have different nutrient needs, which are also dependent on the fertility of your soil, buy a bloom booster with the right nutrient ratio for your plants. If you’re not sure, consult a local agro vet for advice.

Performance and Ease of Use

Analyzing your crops or plants and soil needs are key factors if you want to gain from the full benefits of bloom boosters. With the need at hand, you will be able to pick a bloom booster from different brands available on the market. Buy a bloom booster that’s proven to be efficient and effective in promoting the growth of your plants.

Look for manufacturer's instructions for guidance on how to use the bloom booster for maximum results. If you’re a beginner gardener or using a certain type of bloom booster for the first time, consult with an agro vet to be sure. The ratio or component combination of the bloom booster to water is also important to attain optimal results.


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Get the Best Bloom Booster of 2023!

Whether you need to fertilize your backyard garden or acres of farmland for improved yields, there’s a bloom booster out there to meet your specific needs. We hope that with our review of five of the top bloom boosters, you’ll be in a position to pick the right fertilizer to meet your gardening needs. In case you need something different, check out our other fertilizer reviews.

Our Top Choice
Fox Farm Liquid Nutrient Trio Soil Formula
Best Value
JR Peters Classic Blossom Booster
Advanced Nutrients Bud Candy Bloom Booster
General Hydroponics KoolBloom Fertilizer
Miracle-Gro® Water Soluble Bloom Booster

Bloom Booster FAQs

What is bloom booster fertilizer?
Bloom booster fertilizer is a fertilizing agent that supports healthy, consistent flowering in plants. Thus, it has potassium and phosphorus, which are vital macronutrients when it comes to blooming boosting. By increasing the bloom, the fertilizer helps a plant to develop the best possible flowers.
When do you add a bloom booster?
The best time to add a bloom booster is in the early stages of flowering. As soon as you notice the growth of bright green tendrils or flower buds, apply some bloom booster. That gives the plant the right amounts of phosphorus for chlorophyll development. Phosphorus is also essential since it promotes water movement to the growing flowers. It would help if you kept applying bloom booster during the entire flowering season. The recommended interval of application is after every one or two weeks.
How do you apply a bloom booster?
To apply a bloom booster, spread it on the soil surface around the roots. The fertilizer will dissolve into the water, reaching the roots of the plants. Once the roots absorb it, the fertilizer will boost growth in the flowers.