Top 7 Best Fertilizers for Gardenias | 2021 Reviews (Scotts)

Gardenias are one of the favorite must-haves in a garden. It has a beauty that symbolizes purity and glamor that will make your gardens look fresher and vibrant. It comes with a white, red, and pink variation that looks classic when they bloom. You can put it as a centerpiece of your dining table or as a bridal bouquet.

Growing gardenias at home are possible if you have the right tools, which include fertilizers. Plant food makes them look better and away from pesticides. Since there are too many choices in the market, we made the task easier for you.

In this article, you will find the top-selling and most rated fertilizers for gardenias. We can guarantee you that these are all reliable products from well-known brands.

Top 7 Best Fertilizers for Gardenias Reviewed

  1. Shake ‘n Feed All Purpose Plant Food by Miracle-Gro – Best Overall
  2. Smart Release Plant Food Outdoor and Indoor by Osmocote – Best Value
  3. Cal-Mag Plus by Botanicare – Editor’s Choice
  4. Nutrient-Rich and pH Adjusted Rapid Growth Garden Potting Soil Mix by Happy Frog
  5. Flower Girl Premium Bud & Bloom Booster by Dr. Earth
  6. Turf Builder Winter Guard Fall Lawn Food by Scotts
  7. Performance Organics Blooms Plant Nutrition Granules by Miracle Gro

#1. Shake ‘n Feed All Purpose Plant Food by Miracle-Gro – Best Overall

Shake ‘n Feed All Purpose Plant Food by Miracle-Gro

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  • Item Weight: 5.04 pounds
  • Dimensions: 7.5 x 9.8 x 4.25 inches
  • Duration of Feeding: Three months
  • Area of Coverage: 180 sq. ft.
  • Ratio of Application: ½ cup per 10 sq. ft.

Feeding your plants, particularly gardenias, is an essential routine that you must not miss. A flower’s quality may depend if it is a fed or an unfed plant. If you are only beginning to learn what to use for your gardens, Miracle-Gro’s Shake & Feed catalog is the safest and most reasonable pick. It is effective, cost-efficient, and long-lasting. 

In less than $3, you will have a 4.5-pound fertilizer that nourishes the top and bottom parts of the soil. It targets the roots so that it can fully sustain your flowers and vegetables. This formula is suitable for plants grown in the ground or a container. It does not hurt the soil; instead, it treats and makes it a more livable space. 

Like other products, you must make sure that you used the right amount of this solution for your plants. An excessive amount of it may burn them. It instructs that you only need half a cup in every ten sq. ft. Mixing it with water is not needed because it is ready-to-use.

All you need is to remove the applicator cap, peel off the seal, and flip it open. Spread it evenly and lightly mix to the soil up to three inches. Water the soil and your plants consistently. This formula will last on your soil for up to three months. Reapply it and watch your gardenias bloom as you have never seen such beauty before. 

Some users noticed that their vegetables grew twice the regular size of a normal zucchini or carrot. It can also salvage dying flowers from drying out. Plus, it also hastens your plant’s growth because of its rich and organic components.

Make flowers bloom faster, and vegetables grow bigger
Burns the soil if you miss the ratio
Nourishes the top and bottom layers of the soil
May kill young shrubs
A single application is good for three months
Reasonable price

#2. Smart Release Plant Food Outdoor and Indoor by Osmocote – Best Value

Smart Release Plant Food Outdoor and Indoor by Osmocote

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  • Item Weight: 2.11 Pounds
  • Dimensions: 3.65 x 2.5 x 8.9 inches
  • Duration of Feeding: 6 months
  • Ratio of Application: 3 tbsp. per 4 sq. ft.

Every gardener’s secret weapon is to find a fertilizer that can keep their plants alive and well. Osmocote’s Smart-Release Plant Food Outdoor and Indoor are among the best-selling items in the gardening world if you plan to grow some gardenias. It promises a long-lasting effect and healthier flowers.

This product has 11 essential nutrients that improve your seedlings’ soil’s quality, roots, and health. Whether you keep them inside or outside of your homes, expect this formula to have the same effect. It applies to any varieties of flowers, vegetables, and other seedlings. It can also feed them for up to six months, so you do not need to spend a lot on fertilizer.

Like the first one, it is a granulated formula that asks gardeners not to overdo their concentration. You may add it to a gallon of water or put it directly to your plants. Three tablespoons are enough for a single and regular pot. Please do not forget to water them regularly, so that you will have the best results in a few weeks or months.

You will reap the benefits of using Osmocote in no time; instead of buying gardenias, plant them, and hope that they will not wilt over time. It can also save dying plants and watch them bloom again.

Cost-efficient since reapplication is after six months
Plastic shells do not degenerate along with the nutrients
Good for indoor and outdoor plants
The new formula has plastic-coated granules
Salvages dying plants and flowers
Covers more pots or bigger lawns
Perfect for the winter season

#3. Cal-Mag Plus by Botanicare – Editor’s Choice

Shake ‘n Feed All Purpose Plant Food by Miracle-Gro

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  • Item Weight: 8 ounces
  • Dimensions: 5.1 x 2.3 x 7.3 inches
  • Fortified with Iron, Calcium, and Magnesium supplements
  • Included Formula: 2-0-0 NPK

One way of showing love to your gardenias is to water them daily. While this is a good routine, you can make it better with Botanicare’s Cal-Mag Plus. With daily application, you will see how your flowers and vegetables get healthier every day.

Calcium is an essential nutrient because it ensures that your plants stay healthy and strong. Manganese is responsible for keeping the plant’s ability to absorb more food, boost photosynthesis, and enhance the fruits and flowers’ qualities. All these benefits you will get from a Botanicare product.

The Cal-Mag Plus corrects your gardenias and other plants’ deficiencies so that it can regenerate and revitalize. You can add it to your fertilizer when it is time to feed your plants. Adding it to your plant sprayer is another way of using this item daily. You can use it for your indoor and outdoor plants with similarly effective results. 

Once you notice that your flowers and plants’ colors are starting to turn yellow, add this formula to water. Give it a day or two, and they will look healthier again. However, this item can be a little expensive if you are on a tight budget. It is not as cost-effective as the first two products since you may need to use it daily.

Boosts health, photosynthesis, and growth of flowers
Can be harmful to several plants, like ghost pepper
Improves the yellowing and dry quality of the leaves
More expensive than other items
Has 11 nutrients for overall plant growthThe mixture drips from the bottle
Can be added to fertilizer or sprayer
Good for indoor and outdoor plants

#4. Nutrient-Rich and pH Adjusted Rapid Growth Garden Potting Soil Mix by Happy Frog

Nutrient-Rich and pH Adjusted Rapid Growth Garden Potting Soil Mix by Happy Frog

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  • Item Weight: 8 pounds
  • Dimensions: 1.4 x 17.9 x 13.9 inches
  • Size: 12 quarts of potting soil
  • Ingredients: Soil Microbes, Earthworm Castings, Bat Guano, and Aged Forest Products

Some brands incorporated fertilizers with potting soils. One of them is Happy Frog, and its popular product is the Nutrient-Rich and pH Adjusted Rapid Growth Garden Potting Soil Mix. You do not need to think of which soil and fertilizer to use with this two-in-one formula. Is it worthy of an $18 price? 

From its description, this potting soil is more suitable for container use. It comes with soil microbes and mycorrhizal fungi that produce nutrients useful to your gardenia’s growth. The composted forest humus adds moisture to your flower’s roots so that it can absorb solutions better. By using this mixture, expect an increased amount of flowers that will bloom from each pot. 

Another factor that you will adore about this product is the pH balance it provides to your plants. It makes them absorb more nutrients and allows roots to grow at an optimal level. Unlike the regular soil, this one lets your plants absorb all the nutrients from any liquid mixture as it holds the hydrating solution well. The more water your plants absorb, the stronger and healthier they become. 

Many customers are happy when using any of Happy Frog’s items. Their flowers consistently bloomed, and insects do not pester their indoor plants. Some may find the price a lot expensive than other potting soil brands, but you get what you will pay because of its effective results.

Flowers and other plants grow rapidly with this healthy soilTends to stay wet for too long that causes molds
Balance pH and improves the roots of the flower
Good for container plants only
Discourages insects to pester on plants
Unreasonable price
Holds and absorbs liquid solutions well
Two-in-one fertilizer and potting soil

#5. Flower Girl Premium Bud & Bloom Booster by Dr. Earth

Flower Girl Premium Bud & Bloom Booster by Dr. Earth

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  • Item Weight: 4.1 pounds
  • Dimensions: 3 x 8 x 10 inches
  • Duration of Feeding: Several Months
  • Ingredients: Fishbone Meal, Alfalfa Meal, Feather Meal, Soft Rock Phosphate, and Mined Potassium Sulfate

Dr. Earth is true to its goal of providing earth-friendly materials for your gardening needs. The brand’s products are not too expensive, and they are all beginner-friendly. The Flower Girl Bud & Bloom Booster is not an exception to the brand’s quality.

The first thing that makes this item stand out is its organic components. Unlike other brands, the grains of this fertilizer is not made from plastic. It has 100% natural ingredients that are healthy for your soil and plants. We can assure you that it has no strain of GMO, chicken manure, and sewage. The bacteria coming from these materials are not healthy for your greens and flowers. 

Because of the probiotics found in its formula, your gardenia will have stronger roots, better buds, and more beautiful bloom. The fertilizer’s premium quality neither burns the soil nor dries the plant. You do not need to add more chemical fertilizers because it has everything you need to grow your flowers. Those pots that aren’t blooming for years will have changes as soon as you use this item. 

Because it is organic, it is not harmful to your pets. You must not worry if you find your dog munching in the soil where you put this solution. However, it would help if you still kept it out of your children’s reach. You can expect to have a floral and colorful summer as it lasts for several months in your pot’s soil.

Makes the roots stronger and the flowers’ quality better
Not suitable for indoor plants because of the smell
Does not have GMO, chicken manure, and sewage
The strong odorous smell from the solution
Hydrates plants and flowers that are drying out
Toxic to children
Easy to apply and does not hurt the soil
100% natural and organic

#6. Turf Builder Winter Guard Fall Lawn Food by Scotts

Shake ‘n Feed All Purpose Plant Food by Miracle-Gro

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  • Item Weight: 12.54 pounds
  • Dimensions: 16 x 12 x 3 inches
  • Area of Coverage: Up to 5000 sq. ft.

Summer is the perfect season to grow your plants, like gardenia. However, preparing your lawn should begin in the winter when your soil is still dry. With Scotts’ Turf Builder, you can fertilize your soil to keep it moist, hydrated, and rich in nutrients in the cold weather. Once the sunny season arrives, you are off to a great start for your plants.

This product is unique from the previous items because it has a wider coverage of up to 5000 sq. ft. You will also use this to prepare a healthy and rich soil for your plants; instead of putting it while they are growing. The best thing about it is it helps you prepare when planting season is about to begin. You do not want your gardenia to be planted on dry and weak soil. 

What makes it a must-have is it can surpass drought or the extreme cold. It prepares your lawns to absorb more water and nutrients to improve the plants’ roots. Once you have sprinkled this formula on your lawn, it would be best to water it from 6 AM to 10 AM because you will lose lesser water due to evaporation. 

Since it is more of a soil fertilizer than a flower fertilizer, you should keep in mind that it may cause the growth of unwanted greens, like crabgrass and clover. You need to keep an eye on these weeds because it might affect the soil’s quality where you will plant your gardenias. It is also crucial that you avoid applying it with a too concentrated mix because it might tear your lawn instead of keeping it healthy.

Can withstand extreme weather during the winter season
May increase growth of unwanted grasses
Improves the roots of your plants and flowers
Harms soil with a concentrated mixture
Protects and enriches your lawns
More expensive than other brands
Have a wider area of coverage
Hydrates the soil

#7. Performance Organics Blooms Plant Nutrition Granules by Miracle Gro

Performance Organics Blooms Plant Nutrition Granules by Miracle Gro

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  • Item Weight: 3.43 pounds
  • Dimensions: 4.13 x 7.5 x 9.8 inches
  • Area of Coverage: 165 sq. ft.

Miracle-Gro is a force to reckon with when it comes to fertilizers. Topping our list is an item from this brand, and we will finish it with another product from them. The Performance Organics catalog has an impressive lineup of fertilizers that are 100%natural. It maintains the same quality that other popular Miracle-Gro items uphold. 

It comes with a classic bottle packaging with a purple cap. Unlike others, this product produces results within a week. You will notice that your flowers are blooming better, and they are looking healthier. Unfed plants are incomparable to flowers that eat nutrients from Performance Organics. 

Like most fertilizers, this one is ready-to-use. It would help if you did not mix it with waters to affect the product’s effectiveness. Sprinkle an even amount to your pots or lawns, and mix it with the soil up to three inches. You will see a more vibrant garden after a few weeks. You can reapply this product after four to six weeks. 

Your gardenia will probably bloom as you have never seen it before. The formula is focused on making flowers look fresher and improve the quality of the leaves, stems, and petals. However, you may notice that the solution’s odor will stick to your flowers or your edibles. You may get a little conscious of the solution in this case.

For the best results, you have to follow the product label to avoid damaging your soil or plant. Also, keep an eye on your pet dogs because it may attract their sense of smell. The formula’s odor is a bit strong that your pets may get attracted to digging your pots or soil.

Improve the quality of the soil and vibrancy of flowers
The strong odor sticks to flowers and edibles
Focused on flower bloom
May entice fungus to germinate
See results in one week
The smell is attractive to dogs

Top Pick – Best Fertilizer for Gardenias

You can leave your gardenias unfed in your backyard. However, you do not want to see them dead by the end of the week. That is why you must nurture them with love so that you can witness how they bloom into perfection. Doing it does not take a lot as long as you find the right fertilizer for them.

We mentioned seven of the most reliable and famous brands of floral fertilizers. Miracle-Gro’s Shake ‘n Feed All Purpose Plant Food tops our list because it is friendly to first-timers and experts. No more mixing into water or another liquid formula because you can apply it directly to the soil or your potted plants. Plus, it takes three months before you will need to reapply it. 

Gardening is a relaxing way to free your mind from the hustles and bustles of life. You will feel extraordinary happiness once you see your girls start to bud and bloom. Make that a reality by following our guides on how to keep them rich and healthy.

Best Brands of Fertilizers for Gardenias

Miracle-GroAs you noticed, we featured two products from Miracle-Gro because they garnered top ratings from their customers. As the name implies, the brand brings a miracle to your dying flowers and edibles. With the right amount to the soil, it can fortify your plants’ roots so that they will look alive again. Results may vary, but some of their products may show signs of improvement in a few weeks. 

The price may not be extra affordable, but it is reasonable. You do not have to use the formula daily since some require at least a month before you must reapply it. Welcome the spring and summer with pride because of your beautiful gardenias fed by the nutrients from Miracle-Gro.

OsmocotePeople became more interested in growing indoor plants. If you are one of them, you may be wondering what fertilizer is effective for them. Osmocote has solutions that are great for outdoor and indoor use. They are rich in nutrients that can improve the plants’ photosynthesis despite not getting enough sunlight.

Because of this brand, growing gardenias in your apartment is now possible. However, you have to make sure that you followed the product labels correctly. Too much concentration may damage the soil, so you have to check your measurements. 

BotanicareIf you are into organic products, then Botanicare might be your perfect buddy. For decades, the brand strives to improve its products’ qualities as an add-on to your usual fertilizers. If you observed that the leaves are losing their green pigments, it might be because of the lack of a particular nutrient. With Botanicare, you can pick a specific product that would aid your plants. 

The most important thing that you need to do is identify what your plant needs. Gardenia mostly grows during spring and summer, so you may find some solutions that would hydrate them throughout these seasons.

Three Things That Beginners Need to Know When Gardening – Buyer’s Guide

Learning about gardening may be challenging, but it is a fun activity. It allows you to focus on how to improve the quality of your plants. Sunlight, water, and nutrients are the top three things that your flowers need to grow. While the first two are readily available anywhere, enriching them with nutrients can be a tricky task. Jot down these three things that you need to learn about gardening. 

#1. Understand the Numbers in the Product Labels

The key nutrients found in the fertilizer are nitrogen, phosphorus, and potassium. When you read product labels, you will always see numbers written this way 10-20-10. They correspond to the number of nutrients found in your fertilizer.

In a 100g bag of fertilizer, you get 10g of nitrogen, 20g of phosphorus, and 10g of potassium. This sequence is uniform to all brands. In this case, you have 40g of nutrients, and the rest are humus, fillers, and other essential components. 

Knowing this trick means learning how to weigh which nutrient is more prominent in one product and how it differs from others. This way, you become a smarter consumer when buying fertilizer. You can also ask for a home test kit if you are not yet confident about your choice.

#2. Test Your Soil Before Fertilizing All of It

Beginners may get excited about the promises of an enriched lawn or garden. However, you must test your gardens’ quality first before applying any formula to aid its improvement. To do this, you can take a sample of the soil when it has more moisture. Please put it on a pot and send it to a cooperative or a laboratory that focuses on soil testing. 

If you a hectic schedule, the safest way to treat your soil is to pour two to three pounds of fertilizer in every 100 sq. ft. if you have a 10-20-10 formula. You can also refer to the product label to know how much you should use if it is your first time using your soil for gardening. 

#3. Find a Plant Food Filled With Nutrients

Check on products recommended by many customers when it comes to fertilizers. It would help if you researched before buying a particular brand. Some products have odors that attract pests, so there is a higher chance that they will dig your plants. You may need to mix it with water while others are ready-to-use.

You have to keep in mind what your goals are when gardening. Do you need products that have immediate effects, or would you rather go on something that can last long before reapplying? Are you into convenience or quality? You have to consider many things, and you can begin with the products we listed in this article. 


In summary, fertilizer for gardenias come in different brands and components. What matters is that you know how to read product labels, instructions, and your plants’ needs. Being new to gardening is an exciting experience, but you have to equip yourself with knowledge about different solutions that you can use for your flowers.

We highlighted here the best products that would help in fertilizing your plants. Topping our list is Miracle-Gro products because they are effective and cost-efficient. They are less harmful and do not need a daily application. If you have a hectic schedule, the brand’s products are ready-to-use. All you need is pour it evenly into your soil and potted plants. 

The key to enjoying the fertilizer’s maximum potential is following its set of instructions. Measurement is crucial so that you will not harm your lawns, gardens, and flowers.

FAQs (Frequently Asked Questions)

What are the best fertilizers for flowering plants?

Plants need three essential elements, and they are nitrogen, phosphorus, and potassium. However, your fertilizer must have more phosphorus because it is responsible for foliage, root system, and flowers’ blooming. Check the number of nutrients found in your chosen product, so you will know if it has enough phosphorus content. 

Also, it might be more helpful if you use granules instead of liquid fertilizer. The former lasts longer in the soil, so you do not need to reapply the product more than once a month.

Do I need to put fertilizer on my gardenia?

Yes, you do. It may cost you a few dollars, but it has some advantages that you must not miss. For one, fertilizers are nutrient-specific. If you know what your gardenia needs, it is easier to find a formula that would help you salvage the plant. Second, fertilizers do not only enrich your flowers. It also improves its freshness and vibrancy. Finally, most of them have a fast-acting formula and can stand any extreme weather making it more effective to your needs.

Do fertilizers have any disadvantages?

Some fertilizers are harmful to the soil if you do not follow the product labels. Since it has specific elements, excessive use of it may dry out your soil. One of the functions of fertilizer is to hold more water to hydrate your plants. If the concentration is too much, the amount of water may exceed its normal capacity. Fertilizers may also affect the pH balance of the soil. However, some brands make sure that their products improved the soil’s pH level instead of destroying it.

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