​​15 Best Bloom Booster Fertilizers for Your Flowers (2023)

We know that flowering plants need sun, soil, and water to grow and bloom. You need the right light exposure, the right amount of water, and the correct type of growing medium. 

But did you know that plants also benefit greatly from the right bloom booster fertilizer at the right time?

Bloom Boosters are fertilizers that encourage your flowers to create larger and heavier blooms as they have the base nutrients needed to encourage flowers to grow strong. 

You can also promote big buds and optimal flowering with other techniques, such as correct pruning, but bloom-boosting fertilizers work wonders without the additional legwork. 

Below is a comprehensive list of our top 15 bloom booster fertilizers for boastful and vibrant flowers.

What Is A Bloom Booster Fertilizer?

gardener applying bloom booster fertilizer to a purple color flowering plant

Bloom booster fertilizer stimulates vigorous, healthy plant blooms and is essential during flowering for many plants.

This kind of fertilizer contains more phosphorus and occasionally more potassium than usual fertilizers. When given correctly, you can expect to see much larger blooms than you would without. 

What Plants Benefit Most From Bloom Boosters?

As you might have guessed, the plants that benefit most from Bloom Booster fertilizers are those with flower blooms!

It doesn’t matter if you are planting for a fall garden or for any other season garden; the blooms will always benefit from bloom boosters.

Serious growers and avid hobbyists almost demand a bloom booster to support optimal flower production, especially those who enter competitions.

Still, bloom boosters are not a requirement, and you can support strong and vibrant blooms without the upfront costs of specialized fertilizers – although a bit of extra legwork is required to make that happen. 

Benefits Of Bloom Boosters For Flowering Plants

bloom booster fertilizer sticks near red, yellow and white flowers on a wooden table

Encourage Beneficial Microorganisms in the Soil

Bloom boosters speed up the proliferation of plant-friendly microorganisms, and in turn, these micro populations make potassium (K) accessible for absorption and transport by crops.  

Faster flower production will result from having optimal access to the highest quality ingredients and an increased number of beneficial microbes in the soil, protecting your plants from various soil-borne diseases. 

If you take more vitamins and minerals, you will have better immunity and be less likely to catch a cold; the same goes for plant health.

Adjust Soil pH Level

Most bloom booster fertilizers contain organic nutrients that increase the soil’s pH near the plant’s root zone. Increasing pH is helpful for the plant during the flowering stage as it allows proper nutrient uptake and helps the flowers develop well. 

Academic Study on Effects of Soil PH and Growth

In a study by the University of Milan, plant growth and germination was experimented on with different soil pH levels, testing height and general size changes plus reproductive success. 

The objective of conducting this study was to have conclusive results of the consequences of varying soil ph levels and the effects on plant growth. Until this testing, there had been few or incomplete studies.

Aside from limitations of testing in controlled conditions, the tests indicated that soil pH largely influences a plant’s improvement in growth and flowering.

The study concluded that plants grown at ph5 and ph6 were taller and developed leaves faster than ph7. Plants grown at ph7 didn’t produce flowers, whereas plants at ph5 and ph6 had much larger and more buds.

Enhance Soil Oxygen

An at-home soil test shows how many beneficial microbes your soil contains for nutrient cycling. The beneficial bacteria in the soil ensure enough oxygen is produced and transported through capillary action. 

Enhancing soil quality will give your houseplants and flowers a healthy, strong-blooming life. Let’s take a closer look at how you can perform a soil test.

How To Perform A Soil Test in 3 Steps

  1. Mix one-half cup of vinegar with a half cup of soil. If it fizzes up or bubbles, your soil is alkaline.
  2. Mix half a cup of water with half a cup of soil, then add baking soda. If it fizzes up or bubbles, your soil is acidic.
  3. If neither reaction occurs, your soil is balanced or neutral.

What Is In Bloom Booster Fertilizer?

bloom booster fertilizer macro and micro nutrients displayed with plants and soil

Bloom booster fertilizers are excellent bloom stimulators, encouraging plants to produce abundant fruit and rich blooms. 

Bloom Boosters provide macronutrients, essential amino acids, trace minerals, and other stimulants to plants protecting plants against fragility, nutrient uptake deficiency, and diseases. You will not necessarily increase the number of flowers, but it’s not about quantity but quality.

Nitrogen, phosphorus, and potassium are vital minerals in any excellent bloom booster fertilizer because these are the primary elements that plant tissue needs to thrive and produce flowers.

They also boost the soil’s fertility and water retention ability, and during the flowering phase, these fertilizers are the best way to improve plant flower formation, density, quality, and yield.

Bloom Booster Macronutrients

These fertilizers are high in phosphorus and potassium, essential for vigorous flowering. A consistent supply of these necessary nutrients helps boost a plant’s metabolism, quicken cell division, and assist in the growth of larger buds.

Phosphorus supports robust and healthy flower buds and encourages profuse fruiting and blooming, whereas potassium enhances the quality of flowers as it aids in the movement of sugar and water within plants.

You can find more information about this in this academic study.


Phosphorus is a macronutrient that plays a crucial role in the health of plants. It helps plants endure environmental stress and brutal winters while also aiding in forming plant roots and blossoms.

Low phosphorus levels lead to the yellowing and stunting of leaves, resulting in smaller, undeveloped harvests when harvest time rolls around. Too little phosphorus makes plants more susceptible to diseases, resulting in unhealthy or dead plants. 

Like humans, plants can have too much of a good thing, and an overabundance of phosphorus also puts the plants at risk.

The immediate result of too much phosphorus is that the plant cannot absorb other crucial minerals, and you will notice a darkening of parts of the leaf or stunted growth.


Plants with low potassium levels have short internodes and a stocky look, with younger leaves featuring tiny leaf blades and stunted development. Nutritional imbalance hinders blooms and healthy fruit development.

Bloom Booster Micronutrients

Along with the two essential minerals above, most bloom booster fertilizers contain important micronutrients.

Amino Acids

Amino acids are helpful for flowers in several ways, but only some amino acids are beneficial in flower blooming. Some essential amino acids for flowers in most bloom booster fertilizers are L-Phenylalanine, L-Cysteine, and L-Glycine.

These amino help plants regulate enzymes, transport and synthesize proteins, and reduce sulfur, which helps stimulate bud growth, eventually leading to your plants growing heavier and more prominent flowers.


Your bloom booster might also contain carbohydrates that serve as antioxidants, helping your plants clear toxins and absorb more nutrients and moisture. 

Just as you need to eat carbs while working out to encourage power, it’s the same idea for plants; they need the energy to stimulate growth and vitality, which they get in the form of carbohydrates.


Some bloom boosters include humates like fulvic acid, which aid the proper absorption of all nutrients in the solution, making your plants’ roots permeable and positively affecting their flowering stage.

This study sheds light on the rolg of humate in the growth of plants.

Can Bloom Boosters Increase Crop Yields?

bloom booster fertilizer in hands on the white daisy flowers

A bloom booster is a simple yet effective nutritional solution for your plants during their flowering period. This includes bountiful harvests for most food crops like fruits and vegetables. 

They are helpful for gardeners and farmers who want a rapid yield without investing time in learning soil alteration techniques. Also known as flower fuel, bloom boosters are the popular fertilizers your flowering plants need.

When Should You Apply The Bloom Booster Fertilizer?

The best time and way to apply a bloom booster is to soak the roots as soon as the first bud begins. It ensures that your plant has enough phosphorus to circulate water within the plant body and produce chlorophyll.

You should continue applying a bloom booster while your plant is flowering because if its phosphorus level is too low, flowering plants, whether permanent or annual, will stop producing a cascade of blooms.

Still, bloom boosters are a great way to improve root mass and energy conservation at even the earliest growth stages, which I cover in the section below. 

Why Nourish Your Plant At Every Growth Stage With Bloom Boosters?

gardener applying bloom booster fertilizer to a young plant by hand

Provide Essential Nutrients

Getting essential nutrients is crucial throughout the earliest stage of your plant’s development, ensuring you obtain the ideal pH level and the appropriate mix of essential nutrients.

Improve Root Mass

Adding a root mass enhancer to your plant after it reaches the vegetative stage improves root system growth and the plant’s ability to absorb nutrients faster.

Enhance Energy Conversion

Plants need lots of energy to produce a full, big bloom, and applying an appropriate bloom booster replenishes depleted nutrients in your plant during blooming.

These bloom boosters allow your plants more time to provide your desired high-quality flowers.

How Much Bloom Booster Should You Apply?

by hand application of bloom booster fertilizer to purple color flowering plants in pot

You may need to apply bloom booster fertilizer once or twice a week to your garden plants, and these boosters are equally beneficial for food-bearing plants. 

However, if you plan to fertilize houseplants, you should dilute the bloom booster first, following the directions on your fertilizer packaging.

15 Best Bloom Booster Fertilizers In 2023

With hundreds of bloom boosters on the market, you might need clarification on which one you should use. 

Here is my list of the top 15 best bloom booster fertilizers for outdoor and indoor flowering plants in 2023.  

ProductBest ForApplication Frequency
Miracle-Gro Flower FoodAll vegetables, roses, treesEvery 7 – 14 Days
Jobe’s Organic Rose and Flower FertilizerRoses and flowersEvery 4 – 6 Weeks
FoxFam Happy Frog All-Purpose FertilizerVegetables, flowers, ornamental plantsEvery 3 – 4 Weeks
Osmocote Smart-Release Flower FoodPerennials and vegetablesEvery 4 Months
Jack’s Classic Blossom BoosterFlowering plantsEvery 7 – 14 Days
Dr. Earth Flower Girl Organic Bud & Bloom BoosterFlowers, vines, citrusEvery 2 Months
Espoma Organic Bone MealRoses and flowersEvery 8 – 10 Weeks
Scotts Super BloomOutdoor flowers, flower bedsEvery 7 – 14 Days
Farmer’s Secret Fruit & Bloom BoosterFruitsEvery 7 – 14 Days
Ferti-Lome Blooming & Rooting Plant FoodFruit-bearing plants, shrubs, rosesEvery 7 – 10 Days
Flower FuelFlowers (orchids, vegetables)Once a Week or with Every Watering
Envy Bloom SpecialPlants in containers(flowering annuals and perennials) Every 7 – 14 Days
Bayer Advanced Rose & Flower CareRoses and flowersEvery 4 – 6 Weeks
Down to Earth Organic Bone Meal FertilizerFlowering plants and treesEvery 3 – 4 Weeks
Bloom Booster Incredible BulkSmall gardensEvery 2 – 3 Weeks

1. Miracle-Gro Flower Food

My top recommended water-soluble fertilizer is the Miracle-Gro Flower Food solution. The phosphate in this 15-30-15 NPK powder promotes healthy plant growth and flower development.

It’s simple enough to add to your watering can, and you can use it once or twice weekly.

It stands out from other fertilizers since it provides the best results for both annual and perennial flowers.

2. Jobe’s Organic Rose and Flower Fertilizer

Jobe’s Organic Rose and Flower Fertilizer is a granular fertilizer that is a perfect choice for almost all roses and other flowers, with an N-P-K ratio of 3-5-3.

It’s one of the best, fast-acting, organic fertilizers, and you can apply this mixture around perennials, like roses, every 4-6 weeks.

3. FoxFarm Happy Frog All-Purpose Fertilizer

If you don’t want to buy different fertilizers for your plant species, this Happy Frog all-purpose fertilizer is one of the best as it’s an effective flower fertilizer with active organic matter and beneficial soil microbes.

It has a ratio of 6-4-5 (NPK) and promotes healthy soils, it’s good for ornamental and edible plants, and you can use it by easily dissolving it in water.

4. Osmocote Smart-Release Flower Food

Osmocote Flower Food is one of the most well-known fertilizers that also boost blooms, and you can’t go wrong using it.

An N-P-K (nitrogen, phosphorus, and potassium) ratio of 15-9-12 will help your plants grow lush green quickly, and you’ll love this product as it is suitable for beginners because it’s easy to use.

You don’t need to mess with its slow-release granular mix every week because a single application lasts up to four months. 

You can also sprinkle it easily around already-existing plants.

5. Jack’s Classic Blossom Booster

Jack’s Classic is a water-soluble compound that boosts plants grown in less-than-ideal soil as it has a higher nutrient availability than others, with an N-P-K ratio of 10-30-20.

It’s prepared using an appropriate nutrition micronutrient bundle and is ideal for encouraging robust roots, lush foliage, and healthy plants.

6. Dr. Earth Flower Girl Organic Bud & Bloom Booster

With an N-P-K ratio of 3-9-4, This Organic Bloom Booster is a good option for beautiful results in flowering plants.

It also contains fishbone meal, alfalfa meal, potassium sulfate, feather meal, kelp meal, and kelp flour, which are carefully combined to produce happy blooms.

It even contains seven helpful soil probiotics and microorganisms to ensure healthy blooms.

7. Espoma Organic Bone Meal

Espoma Organic Boan Meal is one of the best natural sources of phosphorus for blooming plants.

It contains nutrient additive organic compounds that organically-grown plants need to generate abundant blooms and is an effective organic product.

The N-P-K (4-12-0) also provides enough nitrogen to promote strong leaf development.

8. Scotts Super Bloom Fertilizer

Scotts water-soluble bloom booster fertilizer has N-P-K 12-55-6.

This blend has all the essential micronutrients that young and seasoned blooming plants need and has a high concentration of phosphorus which aids in quicker plant maturation and abundant bud development.

9. Farmer’s Secret Fruit & Bloom Booster

Farmer’s Secret Fruit & Bloom Booster contains zinc, iron, and supplemental macro- and micronutrients.

This potent liquid fertilizer provides the complete package to enhance your plant’s flowering and has an N-P-K ratio of 2-15-15. It’s also suitable for vegetable plants.

10. Ferti-Lome Blooming & Rooting Plant Food

FertiLome Plant Food Granules are water-soluble and concentrate on the general health of your plants, as they encourage the growth of strong roots and more blooms.

You can use it every 7-10 days (N-P-K 9-58-8) during the growing season to enhance flower growth.

11. Flower Fuel

Flower Fuel is a potent mixture of resin and essential oils that helps produce thick and magnificent blooms, as it contains a whopping total of 40 components.

The nutrients include vital vitamins, hormones, and amino acids, and they help plants produce more yield with better taste. (N-P-K 1-34-32) 

12. Envy Bloom Special

With an NPK ratio of 10-50-10, Envy Bloom Special is a water-soluble liquid plant food that has professional-grade nutrients for healthy plant blooms.

As if by magic, you’ll start witnessing results right after its first application.

13. Bayer Advanced Rose & Flower Care

Bayer Advanced is another one of the best organic bloom booster fertilizers with an NPK ratio of 9-14-9. Unlike chemical fertilizers, it’s a safe alternative for floral and vegetative growth.

It’s a three-in-one substance that functions as plant fertilizer but is also disease/insect preventative and is effective for up to six weeks.

14. Down to Earth Organic Bone Meal Fertilizer

Derived from bone meal and containing calcium, Down to Earth Organic Bone Meal Fertilizer is the ideal combination of phosphorus and calcium for strong plant stock and gorgeous flowers.

It also contains nitrogen for aggressive development, and it’s suitable for organic use promoting fertile soil for prolific blooms with bigger flower sizes. (N-P-K 3-15-0) 

15. Bloom Booster Incredible Bulk

Incredible Bulk is another eco-friendly organic bloom booster for your beautiful flowers.

The balanced combination of potash and phosphate boosts flower garden productivity while enhancing color brightness and general potency. (N-P-K 0.1-10-25) 

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