7 Best Flower Fertilizers For Blooming Plants | How To Apply

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Jun 21, 2023

Have any of your plants ever failed to blossom as you had hoped? They are adorable in the catalogs. So it stands to reason that you anticipate seeing the same picture-perfect blossom show in your yard. Only for it to struggle and sputter.

What prevents your plants from blooming?

I’ll go through every reason your plants may not be performing as they should here, along with what you can do to repair it. Insufficient nutrient availability is the most frequent reason for the lack of blooms, so we’ll start there.

Flowering plants won’t have the energy to develop and maintain buds if they don’t have consistent availability to essential macro and micronutrients and the trace elements needed to increase them. No matter how much sunshine and water they get. The great news is that by finding the best flower fertilizer for your specific plants and shrubs, this problem may be rapidly rectified.

Best Flower Fertilizers

Please read to the bottom for my comprehensive list of the best fertilizers for healthy plants to learn how to enhance blooms and color there. Here are my two top recommendations for the finest flower fertilizer if you need fast, trustworthy guidance.

Which nutrients promote flower growth?

According to studies, plants can detect seasonal changes depending on the amount of sunshine they get and the ambient temperature. Enzymes and proteins are triggered by a rise or reduction in these variables to either speed up or slow down growth and bud formation. Add weather variables to the equation, and flower production will also be impacted.

But even if all these conditions are ideal, plants that lack access to essential nutrients will only produce a few flowers.

Macronutrients like potassium, phosphorus, and nitrogen are necessary for all plants to grow and blossom. However, phosphorus propels the development of buds, fruit, and seeds. Those are the main aims of the reproductive process in flowering plants.

N-P-K Ratio for the Development of Flowers

An NPK ratio heavier on phosphorus and potassium than nitrogen benefits flowering plants. However, whether they are decorative fruiting plants or blooming plants determines when they will profit.

For the duration of the season, one NPK ratio is adequate for ornamentals (and certain vegetables). Using a balance of around 1:3:2 is advised to reflect the percentages of nitrogen, phosphorus, and potassium.

Most fruiting plants, however, have varying nutritional requirements at various stages of development. Giving additional nitrogen initially will improve the performance of fruit trees, berry bushes, melons, and squash. As the buds begin to form, choose other phosphate and potassium.

Effect of Soil pH

A pH range between 5.8 and 6.5 is optimal for cultivating vegetables and numerous ornamentals. The pH range that fruit trees like is 6.0 to 7.5. At the same time, plants like hydrangeas, azaleas, and berry bushes thrive on soil with a pH between 4.0 and 5.0 (lower pH, more excellent acidity).

No matter what your blooming plants want, it’s crucial to get it correctly. Why? Because nutrients become too mobile when the pH of your soil is too low. Meaning they accidentally overfertilize your plants since they flood the earth. Severe plant damage may result from this.

The reverse occurs when the pH is too high. The inability to go toward plant roots results in nutrients being trapped in the soil.


Minerals and trace elements, sometimes known as secondary nutrients, are just as crucial to the health and vitality of plants as macronutrients. Iron, manganese, copper, and boron are a few of them.

With the assistance of their micronutrient counterparts, macronutrients can carry out their functions to the fullest extent.

Minerals combine with nitrogen to create the complex molecules required for structural elements like leaves, stems, and roots. Generating the green chlorophyll cells that enable photosynthesis in plant leaves is the first step in this process.

Minerals, phosphorus, and potassium aid the creation of healthy and plentiful buds, flowers, fruits, and seeds.

Types of Fertilizers for Flowers

There are versatile alternatives for diverse applications and planting preferences among four main fertilizer types.

  • Quick Release – Options that are liquid or water-soluble provide rapid nutritional absorption. It is causing hastened plant development and growth.
  • Slow Release – Concentrated granules and spikes provide a consistent supply of nutrients over a long period with minimal chance of plant burn.
  • Organic – Produced from minerals, plant material, and animal byproducts that offer essential nutrients. It was simultaneously feeding plants and enhancing soil richness.
  • Inorganic – Produced with minerals and compounds — can result in a rapid growth spurt. However, it can pollute the soil and provide minimal fertility.

Liquid Fertilizer

Pre-mixed, concentrated, and water-soluble granules are available for liquid fertilizers. These may be applied around your plants using a watering can or hose connection.

Additionally, liquids might be either organic or synthetic. In either case, the earth quickly transfers nutrients to the root system. Some are also designed to be used as foliar sprays, which may provide yellow foliage immediate relief.

Controlled Release Granules

Depending on the manufacturer, slow-releasing granules may provide constant, regulated sustenance for up to nine months and are very easy to use. Less effort for you and fewer applications as a result. These also have a lower propensity to harm plants, such as by burning the roots.

By raising the temperature of the soil, nutrients are released. These nutrients are subsequently consumed by soil bacteria and fungi and changed into a form that plants can readily absorb.

Organic vs. Synthetic Fertilizers

The decision between an organic and synthetic flower fertilizer comes from gardening preferences, application preferences, and desired results.

Nutrient levels in organic foods are comparable to plants in the wild. They have a low risk of contamination, may feed your plants for more extended periods, and improve soil fertility.

Minerals and materials generated in laboratories are used to mass-make inorganics. These can result in more lush foliage and blooms but might also pollute the soil and adjacent water supplies.

Flower Fertilizer Reviews

Research on product testing and reviews require time, money, and effort. For your convenience, I’ve conducted extensive research on various flowering plants in my garden, both edible and decorative. Here are my top 7 recommendations for fertilizers that will make healthy plants blossom more often.

1. Down to Earth Organic Bone Meal Fertilizer 3-15-0


  • A convenient supply of organic nutrients
  • Contains essential micronutrients for optimum plant health.


  • Could have an earthy odor

This slow-releasing bone meal alternative, which I discussed at the beginning of the post, lasts for up to four months and provides a consistent supply of phosphorus and calcium to my annuals and perennials—Resulting in a profusion of magnificently colored and sized blossoms.

Additionally, these granules worked incredibly well while my melons, squash, and tomatoes were in the blooming period. My yield significantly increased due to better blooming and less bud loss.

New transplants should mix in 1-2 tbsp each hole and then water well. During the growth season, side-dress established plants with 2-4 oz each month.

2. Jack’s Classic Blossom Booster Fertilizer 10-30-20


  • For use with watering cans or hose attachments, quick dilution
  • Exceeds expectations, extends the bloom duration


  • For plants growing in vibrant soil, not advised

No product appears to comprehend the imperfection of everyone’s soil more than this phosphorus-rich recipe from Jack’s Classic. This water-soluble choice will feed flowers blooming in “basically just dirt” to “moderately fertile soil.”

This may be diluted to the desired strength and used to inject my plants with the proper nutrients. I saw robust plants that we’re generating copious amounts of blossoms and had a higher drought tolerance.

Use once a week on blooming plants by combining one teaspoon with 1 gallon of water (or more for further dilution).

3. Jobe’s Organics Rose & Flower Fertilizer Spikes 3-5-3


  • Roses and other floral bushes may benefit from proper nourishment.
  • Longer feeding times and fewer applications with slow release


  • Possibly with a little higher price point than competing brands

These Jobe’s spikes are designed to promote pricey flowers. But with an NPK, that could also help other bloomers. So I experimented with this rose fertilizer spike on a few of my collection’s rose varietals. A few lilacs and peonies were also there.

They’re pretty little and straightforward to shove into the loamy soil around my potted and ground-planted plants, which surprised me. The plant kind didn’t impact performance. Unexpectedly huge buds soon appeared, hinting at future rich beauty and scent.

How To Use: When new growth begins in the spring, sprinkle this mixture of beneficial microorganisms and organic nutrients around perennial flowers like roses every 4-6 weeks.

4. Espoma Organic Bone Meal 4-12-0


  • Natural organic phosphorus and nitrogen supply
  • Aids in breaking up dense, clay soil


  • For plant species that need extra potassium to bud, not advised

Espoma’s equivalent ratio to Down-to-Earth’s is 10 pounds for every 100 square feet (instead of 2.5 pounds), but you only need to apply it once or twice every season instead of monthly.

If you grow your plants organically, there is no better way to feed blooming plants with the natural phosphorus they need to generate an abundance of flowers. Additionally, this NPK provides just enough nitrogen to promote strong leaf development.

How to Use: Trees and shrubs of varying sizes will need either 1 or 2 pounds of application. Use 2 ounces, or one tablespoon, and incorporate it into the soil for each potted plant.

5. Ferti-lome Blooming & Rooting Soluble Plant Food 9-58-8


  • Emphasizes strong root structure to sustain massive, vivid foliage and blooms
  • Sufficient versatility for both veggies and ornamentals


  • The use of phosphorus-sensitive plants is not advised.

These water-soluble Ferti-some granules are designed to promote overall plant health. They are encouraging strong root growth to produce more flowers and healthy foliage.

The plants I tried this on had enormous leaves; some had contrasting vein colors that looked just amazing against the vivid bloom colors.

By the middle of August, I often see some yellowing on my plants from the heat. But since this is also designed to promote resistance to environmental challenges, I didn’t notice any of the plants I tested.

For each gallon of water used, mix two teaspoons into the mixture. Then, during the growth season, repeat every one to two weeks.

6. Scotts Super Bloom Plant Food 12-55-6


  • Effective in both extreme and arid environments
  • prolongation of the bloom period on single-season bloomers


  • To prevent root burns, frequent watering may be essential.

When applied as instructed, this water-soluble, phosphorus-rich mix from Scotts guarantees rapid nutrition while guarding against root burn. My blooming annuals must be started inside since my area has a limited growth season.

On my petunias, pansies, and nasturtiums, this NPK generated many vibrant flowers and accelerated plant maturity for a more extended bloom period!

Naturally, this NPK ratio will also work for perennial shrubs, blooming bulbs, and bushes.

How to Use: Pre-moisten the soil before applying. Next, combine two tablespoons with one gallon of water and water as usual. Every 7 to 14 days, repeat.

7. Miracle-Gro Shake N Feed Rose And Bloom 10-18-9


  • It contains organic components that feed soil microorganisms.
  • Contains essential micronutrient


  • Not advised for soil that is high in fertility

With its straightforward “shake and feed” administration technique, I discovered that this Miracle-Gro granular alternative worked well in the nutrient-depleted soil surrounding several of my potted bloomers.

Each granule is designed to appeal to grazing soil bacteria, which transform nutrients into easily assimilated forms.

Along with the veining and colors in the leaf, the paint on my container selections got more vivid. I no longer saw the browning that would often indicate a nutritional shortage along the margins of the leaves.

How to Use: Spread a spoonful of it over a square foot of soil. Drape on dry. Never add water ahead of time.

Advice on Fertilizing Flowers

The secret to the success of flower seedlings is to wait to fertilize them until they are well-established outdoors because fertilizer might be sensitive to little plants.

After ornamentals are established, a phosphorus-rich NPK will supply the ideal ratio of nutrients for abundant flowers and luxuriant foliage.

When the plant is young, a greater nitrogen NPK will promote robust root development and plant structure in blooming vegetables. More phosphorus will boost wholesome flowers and fruit after the buds have formed.

Make sure your phosphorus-rich flower fertilizer has some sulfur to maintain the ideal pH for acid-loving bloomers so they can produce.

Flowering plant fertilization schedule

Depending on the fertilizer’s composition and delivery technique, you should fertilize blooming plants, whether perennials, annuals, bulbs, or shrubs, at different times of the year.

Slow-release granules and spikes are typically sprayed once when the first new shoots show in the spring. Then, a second time in the summer or the autumn (again, depending on the brand).

When plants are dormant in winter, flowering perennials don’t need fertilization. Even if they are kinds that bloom in the winter and only partly hibernate.

Additionally, liquids should be begun in the spring and continued as the manufacturer directs for the growing season.

When Should I Apply Fertilizer?

The frequency of fertilization varies depending on the technique of administration. For instance, new treatments every four weeks are advised for the quick-acting, organic bone meal from Down to Earth. Compared to the slow-release formula of Espoma, which only requires one treatment in the spring and another in the autumn.

Water-soluble choices like Jack’s Classic and MiracleGro’s BloomBooster formulation should be used every two weeks for constant feeding. Due to water and fertilizer leakage, potted plants’ frequency may be even more significant.


Well, the results are in! The plant type will determine which fertilizer is best for your bloomers.

Regardless of the species, most will eventually need a larger phosphorus dosage. In such case, I suggest going to Down to Earth and picking up some Organic Bone Meal.

The majority of blooming veggies will first need more nitrogen. However, the whole growth season will benefit from a 1:3:2 NPK ratio for these decorative bloomers as they bud. Jack’s Classic Blossom Booster is the ideal option in certain circumstances.

I suggest Jobe’s Organics Rose & Flower fertilizing Spikes for a simple fertilizing method. Simply bury them in the dirt around your floral plants for richer soil and vivid, long-lasting flowers.

The choice of fertilizer you opt for can significantly influence the vibrancy and longevity of your flower gardens. Organic fertilizers, derived from natural sources, nourish not only your flowering plants but also the soil, fostering a healthy ecosystem. They offer a multitude of benefits including slow release of nutrients which promotes sustained leaf growth and colorful blooms. On the other hand, water-soluble fertilizer or liquid plant food like chemical fertilizers, provide an immediate nutrient boost which can be very beneficial when you want to invigorate your flowers bloom quickly.

However, it’s essential to balance the use of organic and chemical fertilizers to maximize their benefits while minimizing potential harm. Regularly fertilize flowers and flowering shrubs, especially those in your flower beds, with the appropriate fertilizers, be it a slow release fertilizer or a water-soluble one. Always bear in mind that over-fertilization can be harmful, hence the importance of understanding how to correctly fertilize flowering plants.

Fertilizing flower gardens with the best flower fertilizers enhances the beauty of your green space, helping your flowers to flourish and present the most vibrant and appealing colors. This not only creates a picturesque landscape but also makes your time and effort worthwhile. Your choice between organic fertilizer and chemical variants, or a blend of both, will be determined by your specific needs and the nature of your plants. By learning and applying these practices, you will ensure your flowers bloom spectacularly season after season.

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