Top 7 Best Fertilizer for Gardenias in 2023

Gardenia is a fragrant, showy, and tropical flower that requires special care to keep it blooming. If you are looking for the best fertilizer for gardenias, this article will be a great guide.

Gardenias bring joy and happiness to everyone who sees them. They are extremely popular and can be found in many places worldwide.

Gardenias are also very easy to grow, making them perfect for beginners who want to start their home garden. But they also require some care and attention to grow and maintain.

First and foremost, gardenias are acid-loving plants and require a soil pH between 5.0 and 6.5 to thrive. Therefore, it is essential to use a specifically designed fertilizer for acid-loving plants.

That being said, here are our top picks of the best fertilizer for gardenias:


Product Name

Editor's Rating


Dr. Earth 703PA Organic Acid Fertilizer

Down to Earth Acid Mix Fertilizer

Perfect Plants Gardenia Liquid Fertilizer

Why Do You Need a Fertilizer for Gardenias

Fertilizers provide plants with the essential nutrients they need to grow and thrive. A fertilizer for gardenias should include an acidic component to provide the necessary acidity that these plants need to flourish.

Without a fertilizer, gardenia plants may not flower or may not produce as many flowers as they could. Fertilizers can also help maintain the health of a gardenia plant by helping to correct nutrient deficiencies.

How to Make Your Gardenia Bloom

To make your gardenia bloom, you must provide it with the right growing conditions. Gardenias need four to five hours of sunlight per day, and they prefer moist, acidic soil. They also need regular fertilization and pruning. If you can provide your gardenia with these conditions, it should bloom regularly throughout the spring and summer.

Gardenia plants flourish in a high level of humidity. You can also feed it a fertilizer specifically for blooming plants. Gardenias may not bloom if they are not getting enough sunlight or are too cold.

What Are the Different Types of Fertilizers

Fertilizers are essential for healthy plants and proper growth. There are three main types of fertilizers:

  • Granular
  • Spikes
  • Liquid fertilizer


Granular fertilizers come in various forms, such as pellets, crystals, or powders. They are easy to spread and distribute evenly over the soil.


Spikes are small fertilizer stakes inserted into the soil near the plant. They release a steady stream of nutrients over time, ideal for flowers and vegetables that grow slowly.

Liquid fertilizers

Liquid fertilizers can be applied with a watering can or spray bottle. The plants quickly absorb them and provide an instant boost of nutrients.

All types of fertilizers can be water-soluble, which means they dissolve in water and can be easily absorbed by the plants. This is the best way to feed young plants or those growing in containers.

The 7 Best Fertilizers for Gardenias

#1. Dr. Earth 703PA Organic Acid Fertilizer

This organic acid fertilizer is made of all-natural ingredients. It is safe for both people and pets, and it comes in a 4lb size. The pro-biotic soil microbes included in this fertilizer help make the soil more acidic, which is beneficial for acid-loving plants like gardenia.

Specially formulated for organic gardening, this acid fertilizer provides exceptional results. The feed lasts several months, and the drought tolerance increases plant performance. This makes it a great choice for environmentally conscious customers who want the best for their plants.

Dr. Earth fertilizer is ideal for acid-loving plants such as azaleas, camellias, maples, and gardenias. It is suitable for use in raised beds and can be applied anytime. It contains no synthetic ingredients, so it is environmentally friendly. This fertilizer is rich in nutrients that help plants grow healthy and strong.

Product Highlights

  • 100-Percent organic formula
  • Make soil acidic
  • Exceptional results
  • No synthetic ingredients
  • Feeds for several months
  • Increased plant performance

#2. Down to Earth Acid Mix Fertilizer

This all-natural fertilizer is blended for acid-loving plants and has a low pH. The formula promotes root growth that helps to resist winter damage. The 5-pound box is an easy way to get the right amount of fertilizer for your needs, and it’s perfect for use on a variety of acid-loving plants.

The 4-3-6 formula is perfect for delivering the nutrients your plants need—the nitrogen, phosphate, and soluble potash help promote healthy growth in gardenia plants.

Additionally, the non-plant food ingredient ensures that the fertilizer is gentle on plants and won’t cause any damage. This acid mix fertilizer is perfect for customers who want to give their plants the best possible care.

Product Highlights

  • All-Natural Fertilizer
  • Specially blended for acid-loving plants
  • Boost resistance to winter
  • Promote root growth
  • 5-pound box

#3. Perfect Plants Gardenia Liquid Fertilizer

Liquid fertilizer is a fast and easy way to provide your plants with the essential nutrients to thrive. This bloom-boosting fertilizer is formulated with all the vital nutrients for flowering bushes.

It promises to deliver consistent blooms and vigorous growth. It’s also easy to use; just mix it with water and pour it on the plants. Best of all, it’s affordable, so you can get the most out of your garden without spending a lot of money.

Gardenia Liquid Fertilizer is a concentrated formula specifically designed for indoor and outdoor flowering plants. It is available in an 8-ounce bottle.

Product Highlights

  • Concentrated formula for flowering bushes
  • Consistent Blooms with all essential nutrients
  • Easy to use and apply
  • It comes in a resealable bottle for effectiveness

#4. Miracle-Gro Water Soluble Plant Food

This water-soluble fertilizer is an easy-to-use fast feed for acid-loving plants. It feeds the roots of your plants, which helps them grow lush foliage.

The fertilizer is specially formulated for gardenia, camellia, holly, hibiscus, hydrangea, and many more, so it’s perfect for gardeners who have a variety of plants in their yard.

There is no need to worry about the correct application rates or getting the fertilizer onto the leaves. This plant food is designed to dissolve in water and be easily absorbed by plants.

It is an excellent choice for gardeners who want to fertilize gardenias. Plus, ironize, and acidify their plants.

You can apply this water-soluble fertilizer every other week, and it’s compatible with any watering can. It comes in a 1.5-pound packing, making it a good value.

Product Highlights

  • Easy and Instant feed
  • Formulated for acid-loving plants
  • Quick results
  • Feed every 1-2 weeks

#5. Jobe’s Fertilizer Spikes

To fertilize gardenias, spikes are an easy and mess-free way to get your acid-loving plants nourishment. This pre-measured and time-release fertilizer will feed your plants for an entire season, and you don’t have to worry about overfeeding them.

Simply insert the spikes around the plant’s perimeter, and they will slowly release the formula straight to the roots. This plant food is perfect for late spring or early summer when you don’t want to deal with a lot of fertilizer runoff. The 10 spikes in this pack will give your plants a healthy boost.

Product Highlights

  • Pre-measured plant food
  • Easy to use spikes with no smell
  • Nourishment straight to the roots
  • Feed for an entire season
  • 10 Spikes packing

#6. Nelson Plant Food for All Acid Loving Plants

This Fertilizer is specially formulated to provide the essential nutrients necessary for the healthy and prosperous growth of gardenia plants. It contains nitrogen (9%), phosphate (13%), and soluble potash (11%).

The three nitrogen sources help to avoid root burn and promote flourishing blooms. Gardenias require acidic soil, and this plant food provides the acidic balance needed for their optimal growth.

Additionally, the plant food is easy to use and helps to ensure that the plants are getting the nutrients they need. Gardenia plants grown in containers may also benefit from using this organic fertilizer, as it will help to keep the soil in the container acidic.

Product Highlights

  • Four acidifying sources
  • Immediate boost
  • It helps to avoid root burn
  • Superior quality fertilizer for gardenias

#7. Jobe’s Organics Soil Acidifier

This soil additive contains Sulfur, which is a natural way to decrease soil alkalinity and make it more acidic for acid-loving plants like gardenias. It is USDA-approved for organic gardening, making it safe for use in your garden.

The granular form makes it easy to apply, and it will help your gardenias thrive. This organic fertilizer is made without any synthetic chemicals, and it’s ideal for gardenia plants, blueberries, and hydrangeas. Plus, the plant food comes in an easy-to-pour 6-pound bag.

Product Highlights

  • Organic Granular
  • Decrease soil alkalinity
  • All-natural Sulfur for acid-loving plants
  • No harmful chemicals
  • USDA Approved for organic gardening
  • Easy pour 6-pound bag

How to Choose the Best Fertilizer for Gardenias

buying guide for the best fertilizer for gardenias

There are a few things to consider when choosing the best plant food to fertilize gardenias.


Gardenias prefer slightly acidic soil, so a fertilizer that is pH balanced is ideal. The plant food should also be high in phosphorus because phosphorus is a key nutrient for gardenia plants.

Nitrogen will also help. That being said, it is best to find a fertilizer specifically designed for acid-loving plants. This will ensure that you are getting the proper nutrients and not a fertilizer too high in nitrogen.

Likewise, it is best to find an organic fertilizer that is low in potassium because potassium can be toxic to gardenia plants.

Soil pH levels are important for plants because they affect the availability of nutrients in the soil. A low pH (acidic) level means more hydrogen ions present than hydroxide ions. This makes nutrients such as phosphorus, potassium, and magnesium less available to plants.

Soil with a pH below 6.0 is considered acidic, and a 7.0 pH is treated as alkaline. Soils with a pH of 6 are ideal for most crops.

NPK Ratio

Gardenia plants need an easily absorbed fertilizer with a high NPK ratio. With approximately 30% nitrogen, 30% potassium, and 30% phosphorus (all in a high-nitrogen form). Phosphorus is the key element that gardenia plants need.

The Roles of Nitrogen, Phosphorus, and Potassium

  • Nitrogen is an essential nutrient for plant growth, as it involves a variety of biochemical processes, including photosynthesis and the synthesis of DNA, proteins, and other molecules.
  • Phosphorus helps in photosynthesis and root development, among other things.
  • Potassium is also an essential nutrient for plant food, helping to regulate water uptake and metabolism.

Type of Soil for Gardenias

type of soil for gardenias

Soil high in organic matter and moisture content is best for gardenia plants. This type of soil will help retain water and nutrients, which gardenias need for healthy growth.

Clay soils are heavy and tend to form hard clumps that don’t drain well. This can be a problem for gardenia plants, which prefer moist, well-drained soil. If you have clay soil, be sure to add plenty of organic matter to improve drainage and air circulation. A raised bed or container may be a better option for you.

Gardenia plants prefer slightly acidic soil with a pH between 5.0 and 6.5. In order to maintain these conditions, it may be necessary to amend the soil with organic matter or peat moss before planting.

You can use a pH test kit to check the soil acidity. A soil pH kit is a tool used to measure the acidity or alkalinity of the soil. The kit contains a vial of pH indicator solution and a glass tube inserted into the ground. The glass tube is filled with the indicator solution, and the color of the solution is used to determine the pH of the soil.

How to Prevent Gardenias From Getting Diseases?

Gardenia plants are susceptible to various fungal diseases, so it is important to take preventive measures to protect them. One way to do this is to water them correctly; make sure the soil is moist but not wet. You should also avoid over-fertilizing, as this can lead to leaf and flower drops. To keep gardenias healthy, you should also remove any dead or damaged leaves and flowers.

Another way to prevent diseases is to ensure that you plant gardenia in the correct soil. Gardenia plants need soil that drains well and is acidic.

Many diseases can affect gardenia plants, but the most common is powdery mildew. The fungus causes this disease and results in a white powdery substance on the leaves and flowers of the plant. The best way to treat powdery mildew is with a fungicide spray. Be sure to follow the directions on the label carefully, and repeat the treatment every 7-10 days until you resolve the problem.

Frequently Asked Questions

When should Gardenias be fertilized?

It is best to fertilize gardenias in the early spring before new growth begins. Gardenia plants need a light application of fertilizer every four to six weeks. Excess fertilizer can damage plants, so it is important to follow the directions on the package.

How do I fix yellow leaves on my gardenia plant?

The yellow leaves on your gardenia plants are likely due to a lack of nitrogen. To fix this, you can add a nitrogen-rich fertilizer to the soil around the plant. Make sure to follow the instructions on the package, and be careful not to over-fertilize, as this can also cause problems for the plant.

Do gardenias like the full sun?

Gardenia plants prefer a full sun location; however, they can tolerate light shade. In areas with hot summers, gardenias may need some afternoon shade.


If you are looking for the best fertilizer for gardenias, look no further than the seven we have mentioned. They will help your plants to grow healthy and thrive. Remember always to read the instructions carefully, as too much of a good thing can be harmful. And finally, enjoy your beautiful gardenias!

Thank you for reading this far! I hope that the information provided in this article will be helpful to you.