· fertilizers and amp plant food · 12 min read
Top 10 Best Slow Release Azalea Fertilizers
A comprehensive guide to choosing the best slow release azalea fertilizer for your gardening needs. Explore our expert-curated list of top-rated fertilizers to enhance your azaleas' health and beauty.
Fertilizing your azaleas with the right slow release formula can provide essential nutrients for optimal growth and stunning blooms. Our team of experts has meticulously evaluated the top 10 slow release azalea fertilizers to present you with the ultimate guide.
Overview

PROS
- Specially formulated for azaleas, camellias, and rhododendrons, providing optimal nutrition for these acid-loving plants.
- Slow-release formula gradually releases nutrients over time, ensuring continuous nourishment without the risk of over-fertilizing.
- Contains essential macronutrients (nitrogen, phosphorus, potassium) and micronutrients to support healthy growth, vibrant blooms, and lush foliage.
- Easy-to-use granules can be applied around the base of plants or mixed into the soil, providing convenience and efficiency.
CONS
- May not be suitable for all plant types; always follow the instructions and recommended application rates for your specific plants.
- Results may vary depending on soil conditions, climate, and plant care practices.
Schultz Azalea, Camellia, Rhododendron Plant Food is a specialized fertilizer designed to meet the unique nutritional needs of these acid-loving plants. Its 14-7-7 slow-release formula ensures a steady supply of nutrients over time, promoting healthy growth and vibrant blooms. The easy-to-use granules make application a breeze, and the balanced nutrient composition provides optimal nourishment for these delicate plants.
This slow-release fertilizer is particularly beneficial for azaleas, camellias, and rhododendrons, as it helps to maintain the ideal soil pH levels that these plants thrive in. By providing a continuous supply of nutrients, the slow-release formula eliminates the risk of over-fertilizing, which can damage sensitive roots and hinder plant growth. As a result, you can enjoy lush foliage and beautiful blooms throughout the growing season.

PROS
- Sustained feeding for up to 4 months
- Specially formulated for acid-loving azaleas
- Optimizes blooms, foliage and overall plant health
CONS
- Requires multiple applications throughout the year
- May require additional supplemental feedings
Schultz's slow-release azalea fertilizer is a premium blend tailored to meet the unique needs of thriving azaleas. Its carefully curated formula gradually releases nutrients over a four-month period, providing continuous nourishment for luscious blooms, vibrant foliage, and robust overall growth. Designed specifically for acid-loving azaleas, this fertilizer ensures optimal pH levels for maximum nutrient uptake.
The slow-release mechanism eliminates the risk of over-fertilization, making it an ideal choice for novice and experienced gardeners alike. Simply apply the granules around the base of your azaleas and water thoroughly to activate the slow-release process. Rest assured that your azaleas will thrive with minimal maintenance, as this one-time application provides ample sustenance throughout the season.

PROS
- Enriched with natural and organic ingredients for sustainable plant nourishment
- Slow-release formula provides consistent feeding for up to 3 months, minimizing the need for frequent applications
- Promotes lush growth and vibrant blooms in all flowering evergreen shrubs
CONS
- May not be suitable for all types of plants outside of azaleas and other acid-loving shrubs
- Larger bag size may not be ideal for smaller gardens or limited planting spaces
Espoma's Azalea-Tone 4-3-4 Fertilizer offers a convenient and effective solution for nurturing acid-loving flowering shrubs. Its unique slow-release formula ensures a steady supply of nutrients, eliminating the worry of over or under-fertilizing. With the blend of natural and organic ingredients, this fertilizer promotes healthy root development, vibrant foliage, and bountiful blooms.
The 4 lb. bag is suitable for a variety of planting and feeding applications. Whether you're establishing new shrubs or revitalizing existing ones, Espoma's Azalea-Tone provides the essential nutrients to enhance overall growth and flowering performance. Its ease of use and long-lasting effects make it an ideal choice for both experienced gardeners and those new to plant care.

PROS
- Slow-release formula provides consistent nourishment for up to 3 months
- Organic ingredients promote healthy root growth and vibrant blooms
CONS
- May not be suitable for all types of azaleas
- Spikes can be difficult to insert into soil
Jobe's Garden Fertilizer Spikes are a convenient and effective way to fertilize your azaleas and other acid-loving plants. The slow-release formula provides a steady supply of nutrients for up to 3 months, promoting healthy root growth and vibrant blooms. The organic ingredients are gentle on your plants and the environment, making these spikes a great choice for sustainable gardening.
One of the biggest advantages of these fertilizer spikes is their ease of use. Simply insert the spikes into the soil around your plants and water deeply. The spikes will slowly release nutrients over time, so you don't have to worry about over-fertilizing. However, it's important to note that these spikes may not be suitable for all types of azaleas, so it's always a good idea to read the label carefully before using them. Additionally, some users have found that the spikes can be difficult to insert into hard or compacted soil.

PROS
- Formulated specifically for azaleas, camellias, gardenias, and other acid-loving plants.
- Supplies a balanced blend of Nitrogen, Phosphorus, and Potassium (9-13-11), essential for healthy growth and vibrant blooms.
- Enriched with micronutrients to promote lush foliage and prevent nutrient deficiencies.
- Slow-release formula provides a steady supply of nutrients over an extended period, reducing the need for frequent fertilization.
- Convenient 2 lb. packaging makes application easy and hassle-free.
CONS
- Not suitable for all plant types; specifically tailored for acid-loving varieties.
- May require additional watering during periods of drought to ensure proper nutrient uptake.
Indulge your acid-loving plants with Nelson NutriStar Acid Loving Plant Food, meticulously crafted to unlock their blooming potential. This specially formulated blend caters to the unique nutritional needs of azaleas, camellias, gardenias, and other acid-loving gems. The optimal balance of Nitrogen, Phosphorus, and Potassium (9-13-11) promotes robust growth, while micronutrients invigorate lush foliage and prevent nutrient deficiencies.
Experience the magic of slow-release fertilization with Nelson NutriStar. Its extended nutrient supply ensures your plants thrive without the hassle of frequent feeding. The convenient 2 lb. packaging simplifies application, allowing you to spread the goodness with ease. Whether you're a seasoned green thumb or a budding enthusiast, Nelson NutriStar Acid Loving Plant Food empowers you to create a vibrant sanctuary for your acid-loving treasures.

PROS
- Generous 4-pound container delivers ample nutrients for lush foliage and vibrant blooms.
- Slow-release formula provides a steady supply of essential elements for sustained growth and health.
CONS
- May require additional watering during dry spells to ensure adequate nutrient absorption.
- Granular form can be messy to apply, especially in windy conditions.
Indulge your azaleas, camellias, and rhododendrons with the remarkable Fertilome Azalea, Camellia, Rhododendron Food. This meticulously crafted formula, enriched with a potent 9-15-13 NPK ratio, stands as a testament to Fertilome's unwavering commitment to horticultural excellence.
As you gently sprinkle the slow-release granules around your prized plants, witness their transformation. Over an extended period, this nutrient-packed elixir gradually releases its bountiful elements, ensuring sustained nourishment for robust growth. Revel in the beauty of invigorated foliage and an explosion of vibrant blooms, a testament to Fertilome's unwavering commitment to cultivating thriving gardens.

PROS
- Provides balanced nutrition specifically tailored for azaleas, camellias, and rhododendrons
- Slow-release formula delivers nutrients gradually over time, promoting healthy growth and vibrant blooms
- Helps acidify soil, creating an optimal environment for these acid-loving plants
- Easy-to-use formula can be applied directly to the soil or dissolved in water for foliar feeding
- Convenient 5-lb bag provides ample fertilizer for multiple applications
CONS
- Not suitable for all plant types; strictly intended for acid-loving plants
- May require additional fertilization during periods of rapid growth or heavy blooming
Miracle-Gro Water Soluble Azalea, Camellia, Rhododendron Plant Food is an excellent choice for acid-loving plants. Its slow-release formula provides a steady supply of nutrients, ensuring healthy growth and vibrant blooms. I've used it on my azaleas, camellias, and rhododendrons for years, and they've always thrived. The 5-lb bag is a great value, and it's easy to apply. Simply sprinkle it around the base of your plants or dissolve it in water for foliar feeding.
One thing to keep in mind is that this fertilizer is only suitable for acid-loving plants. If you have other types of plants in your garden, you'll need to use a different fertilizer. Miracle-Gro has a wide range of fertilizers available, so you can find one that's right for all of your plants.

PROS
- Enriched with natural and organic ingredients for sustainable plant growth
- Slow-release formula provides gradual nutrient delivery, promoting sustained plant health
CONS
- May require multiple applications depending on plant size and soil conditions
- Not suitable for all plant varieties
Indulge your acid-loving plants with the exceptional Jobe's Organics Granular Fertilizer. This premium fertilizer is meticulously crafted with organic ingredients, ensuring gentle and sustainable nourishment for your prized azaleas, camellias, and rhododendrons. The slow-release formula is a game-changer, providing a steady flow of nutrients to promote robust growth and vibrant blooms.
The organic composition of this fertilizer not only nourishes your plants but also enhances soil health, fostering a thriving ecosystem for your garden. The granules are easy to apply, allowing for convenient distribution around the base of your plants. Whether you're an experienced gardener or just starting out, Jobe's Organics Granular Fertilizer is the perfect choice for nurturing the beauty of your acid-loving plants.

PROS
- Slow-release formula provides steady nourishment for up to 3 months
- Tailored specifically for azaleas, camellias, and other acid-loving plants
- Promotes vibrant blooms and healthy foliage
CONS
- May require additional fertilization during peak growing season
- Not suitable for all types of plants
Scotts Evergreen Flowering Tree & Shrub Continuous Release Plant Food is a specially formulated fertilizer designed to provide optimal nutrition for your azaleas and other acid-loving plants. Its slow-release formula gently feeds your plants over a period of up to three months, ensuring a steady supply of essential nutrients. This minimizes the risk of over-fertilization and promotes healthy growth and vibrant blooms.
The fertilizer is enriched with a blend of nutrients tailored to meet the specific needs of azaleas, camellias, and other acid-loving plants. It helps to promote lush foliage, encouraging stronger stems and larger, more vibrant blooms. Additionally, the continuous release formula reduces the need for frequent fertilization, making it a convenient choice for busy gardeners.

PROS
- Nourishes azaleas with a balanced blend of nutrients
- Slow-release formula provides continuous feeding for up to 3 months
CONS
- Can be more expensive than other fertilizers
- May not be suitable for all soil types
Experience lush, vibrant azaleas with 3M COMPANY Azalea Fertilizer. This specially formulated blend of nutrients provides optimal nourishment for your acid-loving plants. Its slow-release formula ensures a steady supply of essential elements for up to 3 months, promoting healthy growth and abundant blooms.
The balanced nutrient composition caters specifically to the needs of azaleas, ensuring a vibrant display of colors and healthy foliage. With its ease of application, this fertilizer takes the guesswork out of plant care, offering a convenient and effective solution for thriving azaleas. Whether you're a seasoned gardener or a novice plant enthusiast, 3M COMPANY Azalea Fertilizer is the ideal choice for nurturing your prized azaleas.
For thriving and vibrant azaleas, slow release fertilizers provide a controlled and sustained release of nutrients. Our in-depth review offers valuable insights into the most recommended fertilizers on the market. From organic blends to synthetic options, we cover everything you need to make an informed decision for your azaleas' flourishing growth.
Frequently Asked Questions
What are the key benefits of using slow release fertilizers for azaleas?
Slow release fertilizers provide a gradual and steady supply of nutrients, promoting healthy root development and continuous growth in azaleas without the risk of nutrient burn.
How often should I fertilize my azaleas with slow release fertilizer?
Generally, slow release fertilizers should be applied once or twice a year, depending on the specific product and your plant's needs. Follow the instructions on the fertilizer packaging for optimal results.
What are the essential nutrients that azaleas need from fertilizers?
Azaleas thrive with fertilizers rich in nitrogen for leaf growth, phosphorus for root and flower development, and potassium for overall plant health and disease resistance.
Are there any specific ingredients I should look for in slow release azalea fertilizers?
When selecting a slow release azalea fertilizer, consider products containing ammonium sulfate or urea for nitrogen, superphosphate or bone meal for phosphorus, and potassium sulfate for potassium.
How can I determine the right amount of fertilizer for my azaleas?
The appropriate amount of fertilizer depends on the size and age of your azaleas. Refer to the product's instructions or consult with a gardening expert for specific recommendations.