The best fertilizers for hydrangeas 2023 (2023)

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A perennial favorite in the landscape, hydrangeas are hardy and relatively easy to care for in a variety of growing areas. While hydrangeas vary in shape, color, and flowering time, they're known for the large flower heads that blanket the plants - so large that the blooms often weigh down the stems. Once established, the hydrangea is one of the most impressive shrubs of the summer season, but it needs fertilizer to reach its full potential.

The best fertilizer for hydrangeas should contain a mix of nutrients to encourage healthy root and branch development while enhancing the colour, size and abundance of the flower heads. Don't just grab a packagegarden fertilizeralbeit off the shelf. Instead, read on to 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: Miracle-Gro Acid loving plant food
  2. RUNNER UP: BIOADVANCED All in 1 Rosenpflege
  3. BEST VALUE: Miracle-Gro Water Soluble Bloom Booster Flower Food
  4. BEST FOR BLOOM: JR Peters Jacks Classic Blossom Booster Dünger
  5. BEST BIO: dr Earth 703P Organic Acid Fertilizer
  6. BEST FOR BLUE: Espoma GSUL6 soil acidifier

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What to consider when choosing the best fertilizer for hydrangeas

Like all plants, hydrangeas draw nutrients from water, sunlight, air, and soil, but not all soil contains the nutrients needed for robust growth and flower development. Hydrangea fertilizer can help here. The best fertilizer for any particular hydrangea plant depends on the gardener's preferred method of getting the fertilizer into the soil and the condition of the existing soil.


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

  • Fluid:Available as a concentrate to dilute with water or as a ready-to-use product, liquid fertilizers are quickly absorbed by the plant's roots and leaves, providing a rapid nutrient boost. Depending on the product, liquid fertilizers are either sprayed onto the leaves of the plant or poured around the base of the plant.
  • Granules:One of the most common forms of fertilizer, granular fertilizer can either be dissolved in water and poured onto the soil or sprinkled around the base of the plant. Time release granules with a polymer coating should be incorporated into the soil around the base of the hydrangeagarden tools. They dissolve slowly and provide the plant with a long-term supply of nutrients.
  • Top:Like delayed-release granules, gardeners often use spikes when looking for long-term plant nutrition. This fertilizer is compressed and formed into hardened spikes that the gardener pushes into the soil around the base of the plant. Over the course of 2 or 3 months, the spikes will slowly dissipate and provide nutrients for the plants.

Organic vs. Inorganic Fertilizers

Most fertilizers designed for feeding hydrangeas contain chemicals, but some contain natural ingredients. Both are great for promoting plant health and producing big, beautiful buds. Choosing one type over the other is a matter of personal preference.

  • Inorganic:This type of fertilizer contains chemical and synthetic nutrients. It was formulated in a lab to achieve specific growth results such as: B. larger or more lush flowers or increased acidity, which is desirable when growing hydrangeas. Inorganic fertilizers can also contain time-released ingredients that slowly dissolve and nourish the plant over a period of weeks or months.
  • Bio:Some gardeners prefer to use only natural fertilizers that contain ingredients like earthworm droppings, poultry manure, or compost.Organic Fertilizerscontain no chemicals and may not be as potent as inorganic fertilizers. However, in addition to the nutritional value, they can also help to improve soil health. For example, compost not only provides the plant with nutrients; It also helps drain heavy clay soil better.

N-P-K ratio

Commercial fertilizers are labeled with the amounts of nitrogen (N), phosphorus (P), and potassium (K) by weight, listed on the package as the N-P-K ratio. Hydrangeas benefit from a balanced all-purpose fertilizer such as a 10-10-10 N-P-K that contains equal amounts of each nutrient. A balanced fertilizer promotes healthy foliage as well as lush buds. For gardeners who are specifically trying to increase the amount and size of buds, a fertilizer with a higher concentration of phosphorus (medium number), such as 10-20-10 N-P-K, may be beneficial.


The hydrangea tolerates partial sun, but prefers a mostly shady place in the garden. If possible, place the shrub where it won't get direct sun in late afternoon hot climates. Morning sun is usually acceptable and well tolerated. In northern climes, where afternoon temperatures are moderate, some hydrangeas will also thrive if given some early afternoon sun. It's the combination of hot temperatures and blazing sun that can take a toll on these spectacular shrubs. Hydrangeas like a permanent spot in the landscape, so plant them in pots orbags growmight not allow the shrubs to reach their full potential.

soil condition

Well-drained soil rich in organic matter is optimal for growing hydrangeas. Heavy, loamy and sandy soils benefit from additional organic matter such as compost or dried leaves. By adding organic matter, the gardener increases drainage and increases the soil's phosphorus content, which is favorable for the production of colorful hydrangea flowers. Before changing the floor, it's a good idea to take a sample of the existing soillocal extension officefor testing. The test results include recommendations for creating a healthy, balanced floor.

color and pH

White hydrangea species only produce white flower heads, but with colored hydrangeas something interesting happens when the gardener changes the pH of the soil. The more acidic the soil pH, the more likely the hydrangea flowers will be blue. The pH scale runs from 0 to 14, with 7 being considered neutral. Values ​​above 7 are basic, values ​​below 7 are acidic. The greater the pH variation, the more pronounced the color change in hydrangeas.

  • Neutral:At a neutral pH of around 7, colored hydrangeas will produce flowers in pink to deep pink tones.
  • Alkaline:At pH levels above 7, hydrangea flowers have a bright, clear pink hue.
  • Slightly acidic:When the pH of the soil is around 6, the flowers will take on a deep pink or even slightly red or purple hue.
  • Strongly acidic:When the soil pH is below 6, hydrangea flowers tend to turn blue. This is the most desirable color for many gardeners who regularly change soil to achieve beautiful blue flower heads.

When purchasing hydrangea fertilizers, you may find that many are labeled as acidic fertilizers. In addition to the N-P-K nutrients in the product, acidic fertilizers contain pH-changing additives such as sulfur or aluminum sulphate. For those striving for blue flower heads, it's worth purchasing a soil pH tester to monitor soil pH levels.

Our top picks

To qualify as a top choice, a fertilizer should provide the nutrients hydrangeas need to develop strong branches, healthy foliage, and beautiful blooms. The best fertilizer for hydrangeas depends on the gardener's goals for this spectacular shrub. Any of the following fertilizers are good for use with hydrangeas, but keep in mind that more is not necessarily better when it comes to fertilizing plants. Follow the application instructions carefully. Don't overfeed hydrangeas; Better to go too little than too much, and use fertilizer in combination with other soil amendments and an optimal growing location.

(Video) Top 5 Best Fertilizers for Hydrangeas Reviews in 2022

Overall best


Miracle-Gro Acid loving plant food


The best overall choice is an acid-based fertilizer from a well-known and reputable manufacturer in the gardening industry. This fertilizer is a water-soluble plant fertilizer for hydrangeas and other plants that prefer slightly acidic soil. It comes in a 1 lb box of fast dissolving granules. She features an N-P-K ratio of 30-10-10 to help hydrangeas have a robust start to spring and grow vigorously throughout summer.

For best results, dilute the product with water as recommended and apply around the base of the plant every 7 to 14 days. The plant fertilizer's mild acidic formulation gently lowers the soil pH, increasing the likelihood that the hydrangea flowers will be a deep pink, purple or blue hue.

Product Specifications

  • Typ:Granular Fertilizer
  • NPK ratio:30-10-10
  • Crowd:1 pound


  • Instant acidic plant nutrition
  • Feeds on roots and leaves
  • Increases flowering performance


  • Additional applications may be required on alkaline soils
  • Smaller box than expected

Get the plant food from Miracle-GroAmazonasand atWalmart.

runner up


BIOADVANCED All in 1 Rosenpflege



This flower fertilizer comes in a 32 ounce jar of concentrated liquid and is suitable for many types of flowers. A single spring application will provide hydrangeas with a steady 9-14-9 N-P-K diet for up to 6 weeks. Designed to encourage large, lush buds, this fertilizer should be diluted with water and then poured around the base of the plant. In addition to the N-P-K nutrients, the fertilizer contains insect control to protect plants from Japanese beetles and other pests, and it also contains disease protection to deter powdery mildew and fungi.

Product Specifications

(Video) Spring Hydrangea Care - 5 Tips for Happy Hydrangeas

  • Typ:liquid fertilizer
  • NPK ratio:9-14-9
  • Crowd:32 ounces


  • Promotes strong plants while controlling pests
  • Prevents mildew, block stain and more
  • Lasts 6 weeks
  • Works on more than just roses


  • Must be mixed with water
  • Contains ingredients that may harm bees

Get the BIOADVANCED fertilizer onAmazonasand atWalmart.

best value


Miracle-Gro Water Soluble Bloom Booster Flower Food



No need to spend a bundle on plant food. This affordable option features a 15-30-15 N-P-K formulation that encourages more buds per bush, along with vibrant flower heads. This is an all-purpose bloom booster suitable for a variety of perennial and annual flowering plants, including hydrangeas.

It provides various minerals including copper, boron and iron to supplement general nutritional deficiencies. The water-soluble formulation should be applied every 7 to 10 days throughout the growing season for the largest, brightest buds and healthiest plants.

Product Specifications

  • Typ:Water-soluble fertilizer
  • NPK ratio:15-30-15
  • Crowd:1.5 pounds


  • Encourages more blooms in most flowers
  • Mixes easily in the watering can
  • Improves the size of some plants


  • Must be properly diluted and applied regularly

Get the Miracle-Gro Plant Food atAmazonas,The home depot, AndWalmart.

Best for flowers


JR Peters Jacks Classic Blossom Booster Dünger



(Video) Pruning & Fertilizing My Hydrangeas! ✂️🌿💚// Garden Answer

Those who dream of growing hydrangea bushes covered in blooms should check out this option from JR Peters. It has a 10-30-10 N-P-K formulation specially formulated to produce lush, vibrant buds on a wide variety of flowering plants and shrubs.

This fertilizer is dissolved in water and the solution is then poured around the base of the plant where it is quickly absorbed by the roots. For consistently large buds, apply the product in mid-spring and every 7 to 14 days thereafter. Although the fertilizer's purpose is to boost bud production, it also contains various vital trace elements to supplement healthy shrub growth.

Product Specifications

  • Typ:Water-soluble fertilizer
  • NPK ratio:30.10.10
  • Crowd:1.5 pounds


  • Contains trace elements with fertilizer formula
  • Works for starts, transplants and established plants
  • Increases blooms on most plants


  • The effectiveness may depend on the existing soil conditions

Get the fertilizer from J.R. PetersAmazonasand atWalmart.

Best organic


dr Earth 703P Organic Acid Fertilizer



Boost acid-loving hydrangeas with an all-organic product. The acidic fertilizer from Dr. Earth 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 selected strains of probiotics that improve soil health and increase plant performance. Some of its ingredients are also said to lower the pH of the soil, making the product suitable for all acid loving plants.

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

Product Specifications

  • Typ:Granular Fertilizer
  • NPK ratio:3-4-3
  • Crowd:4 pounds


  • Feeds acid-loving plants continuously for months
  • Contains probiotics and microbes
  • Effective for transplanting or as a mid-season refresher
  • Improves leaf and flower performance


  • Strong odor could attract dogs or insects
  • Feeds acidic plants, but does not lower soil acidity

Get the dr. Earth fertilizer atAmazonas,The home depot, AndWalmart.

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Best for blue flowers

The best fertilizers for hydrangeas 2023 (8)


Gardeners and landscapers looking to create coveted blue flower heads need look no further than this soil conditioner from Espoma Soil. While not a harsh fertilizer in a healthy sense — Espoma has no N-P-K ratio — the product contains elemental sulfur and gypsum, which work together to lower soil pH and encourage blue hydrangea blooms. For best results, apply Espoma granules around the base of the plant in early spring before the flower buds develop and reapply every 60 days.

Espoma's soil acidifier is a purely natural, organic product. It comes in a 6 lb bag and is suitable for use on hydrangeas and other acid loving plants. Note that the pH will gradually adjust. Depending on the current soil pH, two or more applications may be needed before the acidity is low enough to produce blue flower heads. This product can be used in conjunction with an all-purpose fertilizer to promote robust plant health and blue flower heads.

Product Specifications

  • Typ:Granular Fertilizer
  • NPK ratio:Not listed
  • Crowd:6 pounds


  • Improves soil for acid loving plants
  • Takes a long time
  • Does not conflict with other fertilizers
  • Safe and organic minerals


  • You may have to use more than expected

Get the Espoma soil acidifier atAmazonas,The home depot, AndWalmart.

Our verdict

Our top pick is theMiracle-Gro plant food, as it works effectively to enhance hydrangea flower production even when soil conditions are not acidic. For the best option to increase soil acidity, consider theEspoma soil acidifier.

How we chose the best fertilizers for hydrangeas

For hydrangeas to grow and bloom profusely, you need a fertilizer or soil conditioner made specifically for these acid-loving plants. Our recommendations include a variety of options to enhance the health and beauty of these plants. We've selected traditional water-soluble fertilizers that help stimulate root growth, granular fertilizers containing microbes and fishmeal, and soil conditioners that help increase soil acidity to achieve blue flowers. As a bonus, we've also included an all-in-one product that is an effective pesticide and fertilizer that also helps plants resist common diseases.

We've also included some budget options; However, they may require frequent application for effective fertilization throughout the season. Our favorite options effectively increase the flowering rate of hydrangeas, and gardeners can choose between organic and non-organic.

frequently asked Questions

Hydrangeas grow in most regions of the country and are prized for their spectacular blooms, so it's natural to have a few questions about how to make the most of these showy shrubs.

Q: When do hydrangeas start blooming?

In warm climates, hydrangeas begin to bloom in early summer. In northern climes they bloom in midsummer.

(Video) How to Make Your Hydrangea Bloom

Q: What is the best time to fertilize hydrangeas?

It depends on the type of fertilizer. It's a good idea to give hydrangeas an initial feeding in mid to late spring. After that, add additional fertilizer at manufacturer-recommended intervals. Time-release fertilizers may only need to be applied once every 3 months, while other types should be applied every 1 to 2 weeks.

Q: How do I fertilize hydrangeas?

It is important to follow the instructions on the product label. Liquids can be diluted and poured around the base of the plant or sprinkled onto the foliage, while granules are often incorporated into the top inch or so of soil. Fertilizer spikes are placed near the plant base and pushed below the surface of the soil.


What month do you fertilize hydrangeas? ›

Hydrangeas should be lightly dressed with fast-release fertilizer in March, May, and July. Be sure to spread it around the drip line of the branches and not the base. Water well. If the fertilizer you choose is a slow-release type, remember to lightly cover it with soil to activate the fertilizer.

Should hydrangeas be fertilized in fall? ›

Don't fertilize after August. Fall is the time for hydrangeas to begin preparing for dormancy. Fertilizing at this time may stimulate new growth that will be too tender to withstand the winter. In the South, a late May application and another in July would be about right.

What is the best fertilizer for endless summer hydrangeas? ›

Fertilize your Endless Summer Hydrangeas in the spring with Holly-tone for blue flowers or Plant-tone and granulated lime for purple to pink flowers.

Is Miracle Grow OK for hydrangeas? ›

Miracle-Gro Water Soluble Bloom Booster Flower Food

This is an all-purpose blossom booster that's suitable for use on a wide variety of perennial and annual blooming plants, including hydrangeas.

Can you over fertilize hydrangeas? ›

The first rule of thumb is to NOT over-fertilize your hydrangea plants. We suggest one application of granular fertilizer in spring or early summer, and then follow package instructions afterwards. If you over-fertilize, it can burn the root system of your hydrangea bushes and actually inhibit bloom production.

Is 12-4-8 a good fertilizer? ›

A complete fertilizer, such as 16-4-8, 12-6-6 or 12-4-8, is generally recommended, unless the soil test reveals that phosphorus and potassium are adequate.

Are Epsom salts good for hydrangeas? ›

The short answer is yes it will – Epsom Salts is Magnesium sulfate and Sulfur is the mineral that we apply to the soil to lower the pH. You will also be applying Magnesium which should help enhance the color of your foliage since Magnesium is needed for chlorophyll production.

What do you feed hydrangeas in the fall? ›

Remove any debris that fell off from the base of the plant. You want to make sure your soil is free of any weeds, leaves and dead flowers. If you're growing blue hydrangeas, feed with Holly-tone to keep the soil acidic and the blooms bright. Otherwise, opt for Flower-tone.

Should hydrangeas be cut to the ground in the fall? ›

Fall Forward Pruning

Hydrangeas that bloom on new wood can be trimmed from fall through early spring. Smooth and peegee types are in this group and perform well whether cut to the ground, trimmed lightly or left unpruned.

What is 10 20 10 fertilizer good for? ›

Summary. Low nitrogen and potassium, in combination with higher levels of phosphorus, make 10-20-10 a great choice for gardeners looking to improve root development, homeowners looking for a better root system in warm-season grasses or someone who is growing a newly established lawn in from seed.

Should you fertilize hydrangeas every year? ›

Fertilize hydrangeas twice a year, once in the early spring and again in the early summer. Most people apply fertilizer in May when the plants first start to leaf out. Then, feed them again during the growing season, which is around July. A second feeding is especially crucial in warmer climates.

How do you keep Endless Summer hydrangeas blooming all summer? ›

How do you keep Endless Summer hydrangeas blooming? The best location to ensure continuous bloom is one where the plant receives morning sun and afternoon dappled shade. In too much sun, they might stop blooming.

What is the secret to growing hydrangeas? ›

Most hydrangeas will thrive in fertile, well-draining soils that receive plenty of moisture. Add compost to enrich poor soil. Generally, hydrangeas prefer partial sun. Ideally, they will be given full sun in the morning, followed by some afternoon shade to protect from the hot midday sun.

Do coffee grounds help hydrangeas grow? ›

Coffee grounds add extra acidity to the soil around hydrangeas. On a chemical level, this increased acidity makes it easier for the plant to absorb naturally occurring aluminum in the dirt. The effect is pretty blue clusters of flowers.

What is the best fertilizer for roses and hydrangeas? ›

The best fertilizer for hydrangeas is a granular (i.e., not liquid) fertilizer formulated for woody plants. We find that a rose fertilizer, like Espoma Rose Tone, is an excellent choice - after all, roses are flowering shrubs, just like hydrangeas are.

Does baking soda help hydrangeas bloom? ›

The plants begin to produce fuller and healthier blooms. If your hydrangeas just aren't wowing you like they should, give baking soda a try. And while you're at it, try baking soda in the rest of your garden!

Will vinegar help hydrangeas bloom? ›

Some gardeners have started using vinegar to lower their soil pH to change bigleaf hydrangea (Hydrangea macrophylla) bloom colors. Does this actually work? The short answer is kind of; in theory, it can. But is it your best long-term solution for altering your soil pH?

Is 20 20 20 good for hydrangeas? ›

And the right fertilizer will help your plants stay healthy and produce beautiful blooms throughout the growing season. Southern Ag 20-20-20 All-Purpose Granular Fertilizer is a top fertilizer that will work for any hydrangea.

How often should I Fertilise hydrangeas? ›

Most hydrangeas don't need much extra fertiliser, but woody plant guru Michael Dirr, a retired University of Georgia horticulture professor, says you can apply a balanced slow-release fertiliser in late winter to early spring. Be careful: If you apply too much fertiliser, you might get more leaves than blooms.

Should you remove old hydrangea blooms? ›

Removing the spent blooms triggers flowering shrubs to stop producing seeds and instead put their energy toward root and foliage development. This makes plants stronger and healthier, so by deadheading, you'll be doing your hydrangeas a favor.

What is the best combination of fertilizer? ›

Studies have found that the ideal NPK fertilizer ratio of those nutrients for flowering plants is 3-1-2. (That's 3% Nitrogen, 1% phosphorus & 2% potassium.) So look for that ratio on the label of packaged fertilizers; anything close to a 3-1-2, a 6-2-4 or a 9-3-6 should be ideal.

What is 10 15 10 fertilizer good for? ›

Schultz® All-Purpose Liquid Plant Food 10-15-10 is a concentrated product designed to feed all kinds of indoor plants, outdoor plants, flowers and vegetables. Perfect for transplanting, repotting and rooting. It is a micronutrient-rich fertilizer that will promote new growth. Must be mixed with water.

What is a good fertilizer schedule? ›

A full feeding is recommended at least 5-6 times per year. You want to feed your lawn when it's growing most rapidly. However, you should base the frequency on your climate and the type of grass you have. For example, cool season grasses can be fertilized in late spring, but only if necessary.

Does pickle juice help hydrangeas? ›

Use pickle juice in your flower beds to perk up your acid-loving flowers! Flowers such as hydrangea and rhododendron need acidic soil to thrive. And the best part, no toxic chemicals!

Does sugar water help hydrangeas? ›

Add 1/4 cup of sugar to room temperature water. This helps to feed the hydrangeas' stems. Add a few pumps of hand soap to the water. Soap helps to keep bacteria way.

Can I spray vinegar on hydrangeas? ›

Though vinegar can be fatal to many common plants, others, like rhododendrons, hydrangeas and gardenias, thrive on acidity which makes a bit of vinegar the best pick-me-up. Combine one cup of plain white vinegar with a gallon of water and use the next time you water these plants to see some amazing results.

How do you prepare hydrangeas for winter? ›

Bring potted hydrangeas inside.

Potted hydrangeas overwinter best in a garage or basement where the temperature stays cool but doesn't freeze. The plants will go dormant, but you'll still need to water the pots occasionally, about once a month, to keep the roots moist, until spring.

How do you winterize hydrangeas? ›

How to Winterize Hydrangeas
  1. Clean up your fall garden. Late fall is an ideal time to clear an excess of organic matter out of your garden. ...
  2. Water before the first frost. ...
  3. Lightly prune the plants. ...
  4. Add a thick layer of mulch. ...
  5. Wrap with winter protection.
Feb 11, 2022

Should hydrangeas be cut back for winter? ›

Cut back these shrubs in late winter before new growth begins. Because they need to grow and set buds the same year that they bloom, shrubs that flower on new wood generally start blossoming later than old-growth bloomers, beginning in midsummer and continuing until the first frost.

Can I cut back hydrangeas in October? ›

When to prune? Prune these hydrangeas only after bloom in the summer and not in the fall. Old wood hydrangeas start developing their bloom buds for next year in August and September. If you don't prune your hydrangeas real soon, then it is better to wait until next year.

What happens if you don't cut back hydrangeas? ›

What happens if you don't prune hydrangeas? If you don't prune hydrangeas then they can eventually resemble a tangled mass of woody stems, and the flowers will become smaller and less showy. If your hydrangeas are not blooming, lack of pruning is often a reason.

Which hydrangeas should not be pruned? ›

Old Wood Bloomers

Hydrangeas that bloom on old wood do not need pruning and are better off for it. If you leave them alone, they'll bloom more profusely the next season. But go ahead and gently thin or deadhead. Just remember new growth may come, but that new growth will be without blooms next season.

What is 10 20 20 fertilizer good for? ›

10-20-20 fertilizer is a general-purpose fertilizer that works well in vegetable gardens. It works particularly well with beans and root vegetables. Soybeans, green beans, and runner beans all benefit from high-phosphorus fertilizer.

What is 12 12 12 fertilizer used for? ›

Ideal for vegetable and flower gardens, shrubs and landscape plantings. The quick release formula can be applied every 30 days through-out the growing season to provide primary nutrients to promote plant growth.

What is 12 24 12 fertilizer good for? ›

Trini Farmers | 12 24 12 is that a good fertilizer for citrus.

Should I cut off Brown hydrangea blooms in summer? ›

"If you want a longer stem, you can make a deeper cut as long as it is done before July or August when the plant begins forming buds for next year's flowers." For smooth hydrangeas, she suggests removing the faded flowers as soon as they fade to green to ensure a second flush of smaller flowers in the fall.

Should I water hydrangeas every day? ›

The hydrangea should be watered thoroughly at least 3 times a week. Always water the plant all the way around the container, not just in one place. Water should come out the bottom of the pot. Never let it sit in water which will cause the roots to rot away.

Does Epsom salt help hydrangeas bloom? ›

The short answer is yes it will – Epsom Salts is Magnesium sulfate and Sulfur is the mineral that we apply to the soil to lower the pH. You will also be applying Magnesium which should help enhance the color of your foliage since Magnesium is needed for chlorophyll production.

Is 12 4 8 a good fertilizer? ›

A complete fertilizer, such as 16-4-8, 12-6-6 or 12-4-8, is generally recommended, unless the soil test reveals that phosphorus and potassium are adequate.

What does vinegar do to hydrangeas? ›

Hydrangea flowers will be pink in alkaline soil, but change to blue in acidic soil. So, mix up some apple cider vinegar and water, and give all the acid-loving plants a treat. Or change colors of your hydrangeas on a whim from pink to blue.

What color does Epsom salt turn hydrangeas? ›

Does Epsom Salt Change the Color of Hydrangea? Epsom salts are neutral and will not change the pH of your soil. Therefore, they will not affect the colour of your hydrangeas.

How can I thicken my hydrangeas? ›

As a young plant, it is best to prune or pinch your plant in order to build a full bodied, well-branched plant. Every time you cut off the growing tip of a plant, you get twice as many branches and thus in the long-run, more flowers.


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