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The 5 Best Fertilizers for Gardenias

Only the best fertilizers will allow you gardenias to have beautiful blooms. The difference between a good fertilizer and an average fertilizer can be quite different even though the price may be the same. Don’t let marketing hype or poor decisions impact your gardenias.

Our top recommendation is…

Greenpinky’s top pick:
  • Perfect nutrient balance
  • Quality ingredients
  • Great price
Check Amazon for Best Price

Gardenias are absolutely magnificent when they are raised appropriately. Setting your gardenia up for success is crucial. By using the best fertilizer on the market, you will help maximize your chances of raising healthy gardenias. Unfortunately, there are so many different fertilizers on the market that it can be difficult to choose between the different products nowadays. I’ve done the leg work to help you simplify your decision. Keep on reading to learn more.

Comparing Our Top 3 Recommendations for Gardenia Fertilizers

Nelson Acid Loving Plant Food Huge Blooms For Azalea Jasmines Roses Camellias Gardenias NutriStar 9-13-11 (2 LB)
GreenPinky's Top Pick
Scotts Miracle Gro 1850011 Plant Food 4 lb(1.81 kg)
Jobe's Azalea, Camellia & Rhododendron Fertilizer Spikes, 10 Spikes
Nelson Acid Loving Plant Food Huge Blooms For Azalea Jasmines Roses Camellias Gardenias NutriStar 9-13-11 (2 LB)
Scotts Miracle Gro 1850011 Plant Food 4 lb(1.81 kg)
Jobe's Azalea, Camellia & Rhododendron Fertilizer Spikes, 10 Spikes
N-P-K Ratio: 9-13-11
N-P-K Ratio: 18-18-21
N-P-K Ratio: 9-8-7
81 Reviews
158 Reviews
2,158 Reviews
$23.75
$24.99
$13.58
-
Nelson Acid Loving Plant Food Huge Blooms For Azalea Jasmines Roses Camellias Gardenias NutriStar 9-13-11 (2 LB)
Nelson Acid Loving Plant Food Huge Blooms For Azalea Jasmines Roses Camellias Gardenias NutriStar 9-13-11 (2 LB)
N-P-K Ratio: 9-13-11
81 Reviews
$23.75
-
GreenPinky's Top Pick
Scotts Miracle Gro 1850011 Plant Food 4 lb(1.81 kg)
Scotts Miracle Gro 1850011 Plant Food 4 lb(1.81 kg)
N-P-K Ratio: 18-18-21
158 Reviews
$24.99
Jobe's Azalea, Camellia & Rhododendron Fertilizer Spikes, 10 Spikes
Jobe's Azalea, Camellia & Rhododendron Fertilizer Spikes, 10 Spikes
N-P-K Ratio: 9-8-7
2,158 Reviews
$13.58
Healthy Gardenia Shrub
Healthy Gardenia Shrub

The Best Gardenia Fertilizers

These are our top recommended fertilizers for gardenias. They all have the proper N-P-K ratio and utilize top notch ingredients. Below are some short reviews and descriptions of our best picks

Gardenia Fertilizers Nutrients NPK

Best Fertilizers for Gardenias

N-P-K Ratio: 30-10-10

This fertilizer from Miracle-Gro was crafted specifically with acid-loving flowers such as gardenias in mind. A blend of nitrogen, phosphate, potash, and other trace minerals helps to revitalize the soil and deliver nutrients directly to the plant’s roots. In addition, this water-soluble fertilizer is easy to apply with a watering can, sprayer, or garden hose attachment. Best of all, although it’s strong enough to boost growth and flower production, it’s gentle enough that it won’t burn any flowers and won’t harm any of the surrounding plants.

N-P-K Ratio: 9-13-11

Nelson’s plant food is the perfect choice for flowers such as gardenias because it contains a carefully crafted blend of nitrogen, potash, and phosphate and four acidifying ingredients that lower the pH of the soil. In addition, the nitrogen helps to create greener leaves and gently nourishes the roots. Other minerals and ingredients, such as cottonseed and iron, help to strengthen plants and ensure steady growth. The fertilizer begins to work immediately after application, and plants treated with this flower food are often hardier and produce more flowers.

N-P-K Ratio: 9-8-7

Jobe’s fertilizer spikes make feeding indoor or outdoor plants incredibly simple. They can be pushed into the soil near the plant’s roots, where they will deliver a continuous supply of nutrients directly to the plant’s roots. Because these spikes have a slow-release formula, they feed plants for a full season, so it’s best to apply them during the late spring or early summer months. This particular fertilizer also helps to lower the pH of the soil, creating a high acid level for acid-loving flowers such as gardenias. In addition, the spike shape helps to eliminate runoff, and there is much less mess.

N-P-K Ratio: 3-1-2

This liquid plant food was designed specifically with gardenias in mind and contains a balanced blend of nitrogen, phosphorus, and potassium. The plant food can be easily mixed with water and fed to the gardenias twice a month, from early spring to early autumn, and once a month during the rest of the year. The nutrient blend helps to ensure that gardenias get the exact nutrients and acid levels they need to thrive. Gardeners who use this plant food will find that their gardenias grow larger and stronger and produce more flowers.

N-P-K Ratio: 4-5-4

This organic fertilizer is specifically designed to deliver the nutrients flowers need. The fertilizer contains a balanced blend of fish bone meal, cottonseed meal, potassium sulfate, feather meal, kelp meal, and seaweed extract, all of which contain a variety of vitamins and help to raise the acidity level of the soil. In addition, the fertilizer contains seven probiotics as well as endo and ecto mycorrhizae, which help plants become more drought-resistant. Gardeners who use this fertilizer will find that their gardenias are stronger and have larger blooms.

Best Gardenia Fertilizers

Raising Beautiful Gardenias

Gardenias are well known for the pleasant fragrance and attractive creamy-white flowers. These heat-loving plants are native to tropical regions of Africa, Asia, and Australia. They are not the easiest of shrubs to grow so utilizing the best fertilizer possible is important to help maximize your chances of healthy gardenias.

Proper N-P-K Ratio for Gardenias

Gardenias absolutely need the right amount of moisture. They are not drought-tolerant plants. That being said, the soil should not be soaking wet as this will lead to soggy roots and potentially root rot. Ideally, you want a well-draining soil with organic matter to help retain moisture levels that the shrub needs. You want the soil to be consistently moist or slightly damp. Do not let the soil dry out completely (but also do not over water).

It is preferable if you can direct water directly to the base of your gardenia shrub. I’ve found it much easier to use a soaker hose. It saves me both time and also prevents water on the shrub, which attracts pests and makes it prone to diseases.

Gardenias featured image

Sun-Loving Plants

Gardenias are native to areas that receive plenty of sun and heat. When you are initially selecting a site to plant your gardenia, plant it in an area with full sun. It can survive in areas of light shade, but it flourishes best with full sun.

The only problem with full sun is that it can dry out the soil faster. Try to cover the roots with organic mulch to help prevent this.

Bottom Line

Again, I recommend buying the Miracle Gro’s Miracid Fertilizer. Don’t make the mistake of buy any average fertilizer at your local gardening store. Many of them will simply not produce the same results. You cannot go wrong with any of the fertilizers above. 

About the author: Carley Miller is a horticultural expert at TheGreenPinky. She previously owned a landscaping business for 25 years and worked at a local garden center for 10 years. Read More