The Best Fertilizers for Hydrangeas

Hello, my friend, hello again; today we come together to talk about The Best Fertilizers for Hydrangeas and hope the blog can help you.

With suitable soil and an optimal fertilizer, this showy shrub will produce a bounty of large, beautiful blooms.

A perennial favorite in the landscape, hydrangea is hardy in a wide range of growing zones and is a relatively easy keeper. While hydrangeas vary in form, color, and bloom time, they are known for the large flower heads that cover the plants—so large, in fact, the blooms often weigh down the stems. Once established, the hydrangea is one of the summer season’s most impressive shrubs, but it needs fertilizer to reach its full potential.

The best fertilizer for hydrangea plants should contain a blend of nutrients to encourage healthy root and branch development while boosting the color, size, and quantity of flower heads. Don’t just grab a package of garden fertilizer off the shelf, though.

We recommend Espoma Organic Holly-Tone 4-3-4 as our top pick for its versatility, organic formulation, and availability. There are other common hydrangea fertilizer options on the market, including Miracle-Gro Acid-Loving Plant Food and JR Peters Jacks Classic Blossom Booster Fertilizer. However, they do not meet our sustainability guidelines and are not recommended in our top picks due to their potentially harmful ingredients and negative impact on the environment.

Learn what to look for when choosing a fertilizer for hydrangeas, and find out why the following products can help this impressive plant become a focal point in the landscape.

1. BEST OVERALL: Espoma Organic Holly-Tone 4-3-4
2. RUNNER-UP: Down to Earth All Natural Acid Mix Fertilizer
3. BEST BANG FOR THE BUCK: Miracle-Gro Performance Organics Blooms Plant Nutrition
4. BEST FOR BLUE: Dr. Earth Acid Lovers Organic Acid Fertilizer
5. MOST VERSATILE: Dr. Earth GL61100518430 Fertilizer
6. BEST ACIDIFIER: Espoma Organic Soil Acidifier

Before You Buy a Fertilizer for Hydrangeas

Before buying fertilizer for hydrangeas, it’s important to perform a soil test to determine the soil’s pH level and check for nutrient deficiencies. Hydrangea blooms will vary in color based on the acidity of the soil, and if the pH level is too high or too low, it can affect the plant’s ability to absorb essential nutrients from the soil. A soil test can also reveal if the soil lacks certain nutrients, such as nitrogen, phosphorus, or potassium, which can affect the plant’s growth and overall health. Knowing the soil’s pH level and nutrient content enables shoppers to choose the appropriate fertilizer and make any necessary amendments to ensure hydrangeas thrive.

How We Chose the Best Fertilizers for Hydrangeas

To keep hydrangeas growing and blooming bountifully, you need a fertilizer or soil amender that’s made specifically for these acid-loving plants. Our recommendations include a variety of options to help improve the health and beauty of these plants. We’ve selected traditional water-soluble fertilizers that help stimulate root growth, granular fertilizers, and soil amenders that help increase the soil’s acidity to achieve blue flowers.

To qualify as a top pick, a fertilizer should provide the nutrients hydrangeas need for developing strong branches, healthy foliage, and beautiful blooms. Our favorite options effectively increase the bloom rate of hydrangeas, and gardeners can choose between organic and non-organic products.

Our Top Picks

The best fertilizer for hydrangeas will vary depending on the gardener’s goals for this spectacular shrub. Any one of the following fertilizers is well suited for use on hydrangeas, but keep in mind that more is not necessarily better when it comes to fertilizing plants. Follow application instructions carefully. Do not overfeed hydrangeas; rather, err on the side of too little rather than too much and use fertilizer in combination with other soil amendments and an optimal growing location.

Best Overall

Espoma Organic Holly-Tone 4-3-4

See It

The best overall pick is an acid-based fertilizer from a well-known and respected manufacturer in the gardening industry. A granular plant food designed for hydrangeas and other plants that prefer slightly acidic soil, this fertilizer comes in a 4-pound bag of granules. It features a 4-3-4 N-P-K ratio to help hydrangeas get off to a robust start in spring and grow vigorously throughout the summer.

The plant food’s acid formulation gently reduces the soil’s pH level, increasing the chance the hydrangea flowers will be a deep pink, purple, or blue tone. Along with hydrangeas, this fertilizer works well for holly, azaleas, rhododendrons, blueberries, evergreens, strawberries, camellias, and other plants that thrive in acidic soils.

Product Specs

• Type: Granular fertilizer
• NPK Ratio: 4-3-4
• Quantity: Two 4-pound bags

Pros

• This versatile fertilizer is suitable for a wide variety of acid-loving plants
• The slow-release formula of this fertilizer ensures plants only need to be fertilized twice a year
• This product is readily available from major retailers at an affordable price

Cons

• Might need extra applications on alkaline soil
• Smaller box than expected

Get the Espoma Organic Holly-Tone 4-3-4 at Amazon or The Home Depot.

Runner-Up

Down to Earth All Natural Acid Mix Fertilizer

See It

This acidic, granular fertilizer comes in a 5-pound bag and is suitable for use on many types of flowers and plants. One application will provide hydrangeas with a steady 4-3-6 N-P-K diet for about a month. In addition to the N-P-K nutrients, the fertilizer contains additional beneficial ingredients like calcium and magnesium as well as sulfur, which helps to make the soil more acidic.

Designed to encourage large, bountiful blooms, this fertilizer should be spread around the base of the plant at a ratio of 1 pound per 1 inch of trunk diameter. Along with hydrangeas, it’s a great pick for feeding rhododendrons, azaleas, camellias, evergreens, blueberries, raspberries, and strawberries.

Product Specs

• Type: Liquid fertilizer
• NPK Ratio: 4-3-6
• Quantity: 5 pounds

Pros

• The versatile formula is suitable for a wide variety of acid-loving plants
• This fertilizer contains a balance of macro-nutrients as well as magnesium and calcium
• The pH balancing effect of this fertilizer encourages colorful blooms

Cons

• This fertilizer must be applied monthly for the best results

Get the Down to Earth All Natural Acid Mix Fertilizer at Amazon.

Best Bang For The Buck

Miracle-Gro Performance Organics Blooms Nutrition

See It

There’s no need to spend a bundle on plant food. This affordable option features an 8-8-8 N-P-K formulation that promotes more blooms per shrub, along with vibrant flower heads. This is an all-purpose blossom booster that’s suitable for use on a wide variety of perennial and annual blooming plants, including hydrangeas.

It provides various minerals, including copper, calcium, and iron, to supplement common nutrient deficiencies. The water-soluble formulation should be applied every 7 days throughout the growing season for the biggest, brightest blooms and healthiest plants.

Product Specs

• Type: Water-soluble fertilizer
• NPK Ratio: 8-8-8
• Quantity: 1 pound

Pros

• Along with macro-nutrients, this fertilizer includes key micro-nutrients
• This versatile fertilizer is suitable for a variety of flowering plants
• Water-soluble fertilizers are easy to apply evenly

Cons

• This fertilizer must be applied weekly for the best results

Get the Miracle-Gro Performance Organics Blooms Plant Nutrition at Amazon, Lowe’s, or The Home Depot (2.5 pounds).

Best For Blue

Dr. Earth Acid Lovers Organic Acid Fertilizer

See It

Dr. Earth’s acid fertilizer contains only natural ingredients, including alfalfa meal, bone meal, and kelp meal, in a 3-4-3 N-P-K formulation. In addition to nutrients, it contains select strains of probiotics that improve soil health and increase plant performance. Some of its ingredients are designed to reduce the soil’s pH level, too, making the product suitable for use on all acid-loving plants and increasing the chances that hydrangeas will produce blue flowers.

For the best results, apply in mid-to-early spring and then every 60 days afterward. The granules should be mixed with the soil and watered well.

Product Specs

• Type: Granular fertilizer
• NPK Ratio: 3-4-3
• Quantity: 4 pounds

Pros

• This fertilizer continuously feeds acid-loving plants for months
• Along with macro-nutrients, the formula includes probiotics and microbes
• By lowering the soil’s acidity level, this product encourages vibrant blue blooms

Cons

• The strong smell of this product could attract dogs or insects

Get the Dr. Earth Acid Lovers Organic Acid Fertilizer at Amazon or The Home Depot.

Most Versatile

Dr. Earth GL61100518430 Fertilizer

See It

Dr. Earth Flower Girl has a 3-9-4 NPK analysis and includes additional probiotics to boost overall plant health, making it a great option for feeding bulbs, tubers, corms, and rhizomes. It contains eight strains of ecto- and endomycorrhizae, which work together to increase drought tolerance and provide enhanced nutrient availability.

The 4-pound bag of granules is designed to provide slow-release nutrients for several months after the initial application. The formula includes ingredients like fish bone meal, alfalfa meal, feather meal, soft rock phosphate, and mined potassium sulfate, and is GMO-free. It’s free of chicken manure and sewage sludge.

Product Specs

• Type: Granular
• NPK ratio: 3-9-4
• Quantity: 4 pounds

Pros

• This all-purpose fertilizer is suitable for use on a variety of plants, trees, and shrubs
• Macro-nutrients are supplemented with probiotics for optimal overall plant health
• The GMO-free formula doesn’t contain any chicken manure or sewage sludge

Cons

• Some users have reported that this fertilizer encourages gnat infestations

Get the Dr. Earth GL61100518430 Fertilizer at Amazon or The Home Depot.

Best Acidifier

Espoma Organic Soil Acidifier

See It

Gardeners and landscapers looking to create highly desirable blue flower heads need look no further than this soil acidifier from Espoma Soil. While not a strict fertilizer in the common sense—Espoma does not come with an N-P-K ratio—the product does contain elemental sulfur and gypsum that act together to lower the soil’s pH level, encouraging blue hydrangea blooms. For the best results, apply Espoma granules around the plant’s base in early spring before flowerhead buds develop and reapply every 60 days.

It comes in a 6-pound bag and is suitable for use on hydrangeas and other acid-loving plants. Be aware that pH levels adjust gradually. Depending on the soil’s current pH level, two or more applications may be necessary before the acidity is low enough to produce blue flower heads. This product can be used in conjunction with an all-purpose fertilizer to encourage robust plant health as well as blue flower heads.

Product Specs

• Type: Soil acidifier
• NPK Ratio: N/A
• Quantity: 6 pounds

Pros

• This product amends soil for acid-loving plants and creates blue hydrangea blooms
• While it doesn’t contain fertilizer, it also doesn’t conflict with other fertilizers
• This acidifier only needs to be applied every 60 days for the best results

Cons

• This product does not provide plant nutrients and should be combined with a traditional fertilizer

Get the Espoma Soil Acidifier at Amazon or The Home Depot.

Or, DIY Your Own Fertilizer for Hydrangeas

One of the most effective and sustainable ways to make fertilizer for hydrangeas is by making compost from household scraps. Composting is a process of breaking down organic materials, such as fruit and vegetable scraps, leaves, and grass clippings, into nutrient-rich soil amendments that can be used to fertilize plants.

Start by collecting organic materials that are rich in nutrients, such as banana peels, eggshells, coffee grounds, and fish emulsion. Add them to an outdoor compost bin and mix in leaves and grass clippings.

Once the compost bin includes a good mix of materials, add some water and turn the compost pile regularly to provide oxygen and ensure even decomposition. As the compost breaks down, it will transform into a nutrient-rich soil amendment that can be added to the soil around the hydrangeas.

Not only is making compost a great way to provide hydrangeas with natural and healthy fertilizers, but it also helps to reduce waste and minimize environmental impact.

Jump to our Top Picks

What to Consider When Choosing a Fertilizer for Hydrangeas

Like all plants, hydrangeas draw nutrients from water, sunlight, air, and soil, but not all soil contains the nutrients necessary for robust growth and flower development. That’s where hydrangea fertilizer can help. The best fertilizer for any individual hydrangea plant will depend on the gardener’s preferred method of delivering the fertilizer to the soil, and the condition of the existing soil.

Type

Hydrangea fertilizers come in three primary forms: liquid, granule, and compressed spikes. All three offer slightly different benefits.

• Liquid: Available as either a concentrate for diluting with water or a ready-to-use product, liquid fertilizers are quickly absorbed by the plant’s roots and leaves for a fast boost of nutrients. Depending on the product, liquid fertilizers are either sprayed on the plant’s foliage or poured around the plant’s base.
• Granules: One of the most common forms of fertilizers, granule fertilizers can either be dissolved in water and poured on the soil or sprinkled around the plant’s base. Time-release granules, which have a polymer coating, should be worked into the soil around the hydrangeas’ base wit