How to Plant, Grow, and Care For BloomStruck® Hydrangeas

Looking for a popular type of hydrangea that's both easy to grow, and available across most nurseries across many hardiness zones? Bloomstruck hydrangeas are popular for a reason, and are fairly low-maintenance compared to other hydrangea types. In this article, gardening expert Jill Drago examines all you need to know about Bloomstruck Hydrangeas, including their maintenance and care.

Bloomstruck Hydrangea Blossoming in Garden


If you want a flowering shrub that puts on a season-long show, BloomStruck® Hydrangeas are the plant for you. In their native habitat, hydrangeas can cover the mountainsides of Asia. These flowering shrubs have come so far that today they can be seen in most manicured gardens and in wooded areas where they help with erosion control. 

Throughout this journey, the hydrangea has been hybridized quite a bit. The goal was always to make the plant better, stronger, and more beautiful. One of the most amazing hybridizations falls into the endless summer hydrangea group. These hydrangeas have developed to give us two full blooms each year. This allows our gardens to be full of fresh hydrangeas for an extended time.

There are many varieties within the endless summer collection of hydrangeas, but none quite so boldly colored or stunning as BloomStruck®. Let’s learn how to care for the BloomStruck® hydrangea

What are BloomStruck® Hydrangeas?

A close-up of 'BloomStruck' Hydrangea flowers which have a soft blue petals, creating a captivating contrast against the lush green leaves. The leaves are big and wavy, with deep green colors that give a refreshing vibe.
The Endless Summer collection includes the BloomStruck® hydrangea, a type of hydrangea.
common-name common name BloomStruck® Hydrangea
botanical-name botanical name Hydrangea Macrophylla ‘PIIHM-II’ PP25,566
genus genus Hydrangea
plant-type plant type Deciduous Shrub
bloom-colors bloom colors Blue-Purple, Green, Rose-Pink,
sun-requirements sun requirements Partial Shade
water-needs water needs Average
height height 3-4 feet
hardiness-zones hardiness zones USDA 4-9
soil-needs soil needs Acidic, Sandy Loam
where-to-plant where to plant Border gardens, Container gardens, Perennial gardens

The BloomStruck® hydrangea is a member of the Endless Summer® collection. Endless summer hydrangeas are the first hydrangeas to bloom on both old and new wood, providing your gardens with an entire season of fresh gorgeous blossoms.

BloomStruck® will bloom either in shades of blue or pink, depending on the pH of your soil. These colorful mophead flowers will bloom on top of solid and sturdy stems with a reddish-purple tint. The stems and veins of the leaves also have this pretty red hue. The leaves will turn red in fall, continuing the color show that ‘BloomStruck’ promises.

Why You’ll Love Them

The young 'BloomStruck' Hydrangea plant is carefully placed in small black pots on a brown table, surrounded by gardening tools. The plant has a strong stem with green leaves that have a velvety texture. Its roots are neatly arranged, ready to be planted in the soil.
This hydrangea produces two sets of blooms during the growing season.

If you are looking for a bigleaf hydrangea that will keep your garden looking beautiful all season long, BloomStruck® is a great choice for you!

This hydrangea will give you two sets of blooms throughout the growing season, keeping it fresh and full of color for much longer than many other hydrangea varieties.

It is also incredibly easy to care for. Your maintenance schedule will consist of watering and deadheading.


A man is holding a cluster of slender, green trimmed branches of a plant. The trimmed leaves have a glossy bright green color, indicating a healthy state. There is a green garden in the blurred background.
Hydrangeas are an excellent option to begin experimenting with propagation in your garden.

It is prohibited to propagate BloomStruck® hydrangeas for sale because it is a trademarked variety. However, hydrangeas are a great place to start if you want to play around with some propagation in your garden. 

The first step is to gather all the necessary tools. You most likely will have all of the supplies you need right at home:

  • Clean garden snips
  • Empty and clean pots
  • Potting soil or sterile growing medium
  • Water
  • Rooting powder
  • Garden stones or bricks
  • Plastic bag

There are two primary ways to propagate these flowers: cuttings and layering.


Cuttings are pieces of fresh twigs that take root and grow into new plants. To take cuttings:

    1. Fill a pot with a well-drained soil blend or a sterile propagation mix.
    2. Snip a 6-inch section of green growth with a few sets of leaves off your shrub.
    3. Trim the leaves from the bottom few inches.
    4. Dip the cutting in rooting powder.
    5. Stick the cut and dipped end into your pot.
    6. Put a plastic bag over the top of the cutting to create a greenhouse effect.
    7. Keep the cutting in indirect sunlight and keep the soil moist.
    8. Every few weeks, tug on the cutting. When you feel resistance, you have roots!
    9. Transplant using the directions below!


Ground layering is when you bury a stem still attached to the mother plant. As it grows its own roots, it can eventually be cut from the original shrub and transplanted to a new bed.

    1. Select a branch that is growing close to the ground.
    2. Scrape some of the bark off of the branch.
    3. Place the branch into a shallow hole.
    4. Cover the branch with soil and use a stone or brick to keep it in place.
    5. You will notice roots forming in a few weeks.
    6. Cut the new hydrangea from the mother plant and move it to a new area in your yard.

Planting Steps

A man is holding a young 'BloomStruck' Hydrangea plant with green leaves, preparing to plant it in small black pots. The leaves are soft to the touch, with shades of light and dark green, reflecting the plant's vibrant and lively nature. Beside the plant is a small shovel, ready to dig into the soil.
The ideal periods for planting are spring and fall.

The best time of year to plant BloomStruck® hydrangeas is in spring or fall. The cooler temperatures will help the hydrangea establish itself without too much risk of transplant shock. 

Find your perfect partially shaded area in your garden and get digging! The hole should be about twice as wide and twice as deep as the root ball of your hydrangea. Place the hydrangea in the hole and ensure the plant is straight and any holes in the shrub are facing the back. Backfill with your garden soil and compost.

Watering your hydrangeas will be crucial to their success in your garden. Not only will you need to water them heavily for the first two weeks or so, but you must also keep an eye on them for their entire first growing season. This is why I prefer to do my planting in the springtime. 

If you have planted your hydrangeas in a large container, you must check the soil moisture daily. This is because the smaller amount of soil means less available water. If your hydrangea leaves point to the ground, this is a sign that it could use a drink.

How to Grow

BloomStruck® is delightfully easy to care for. Follow the steps and tips below to ensure you are getting the most out of your hydrangeas. 


A potted 'BloomStruck' Hydrangea plant basks in the sun, its green leaves soaking up the light. The leaves have dark parts to it, providing a contrasting texture that enhances its natural beauty. The stem is strong and sturdy, supporting the plant's weight, while also displaying a touch of elegance and grace.
For the best growth, placing it in an area with partial sun is recommended.

These flowering shrubs grow best in partial sun. Partial sun is about 4-5 hours of direct sunlight per day. It is even better if this sunlight is in the morning. Sunlight is vital for hydrangeas because it aids in the production of the flowers, which is pretty much why we are all growing hydrangeas, isn’t it?

However, too much sunlight for a bigleaf hydrangea can burn the leaves and cause them to continually dry out too quickly, which results in plant death over time. 


A silver watering can made of steel is being used to plant small green plants in black pots. The can is held above the pots, and water is pouring out of its spout, providing the plants with the necessary moisture for growth. The small size of the pots suggests that the plants are still young and need proper care.
To promote better water absorption and prevent fungal diseases, it’s best to water the plant at its base.

This hydrangea variety requires an average amount of water, about one inch of water per week. The best practice is to water at the base of the plant. This will ensure that the roots absorb all the water they can while also aiding in the prevention of fungal diseases. 


On a brown table, several green plants are arranged in small black pots. A container filled with dark, rich soil is present, and a small shovel is seen beside it.
Excess water around the roots can result in root decay and other fungal problems.

This variety of hydrangea will grow well in most soil types. The key to keeping BloomStruck® happy is ensuring that your soil can retain some moisture without pooling. Too much water around the roots can lead to root rot and other fungal issues. 

Climate and Temperature

A close-up of 'BloomStruck' Hydrangea leaves in pots is shown. The leaves are moist, with water droplets visible on the surface. The leaves' color is bright green, and the edges are slightly jagged, adding texture to the leaves.
This hydrangea is highly cold-resistant but thrives in colder zones when protected from winter winds.

BloomStruck® is hardy in zones 4-9. This is a broad range; this plant is known for being exceptionally cold-hardy. However, this may not be the best shrub to plant in cooler zones unless you can protect it from winter winds.

If you plant it in warmer zones, take extra care to locate the plant in an area with morning sunlight and afternoon shade. This will ensure that the shrubs do not dry out too quickly. 


Small black pots are arranged on a brown wooden surface, waiting to be filled with dark, rich soil using a small shovel. Some pots already have small green plants in them.
Avoid fertilizing after August since it will promote growth that cannot survive the winter temperatures.

To keep your BloomStruck® hydrangeas looking their best, you may want to add a bit of basic fertilizer in the spring. You may use your general landscape fertilizer, such as a 10-10-10, or you may wish to bump up your blooms with a higher phosphorous fertilizer, such as flower tone.

Do not fertilize your hydrangeas after August. Feeding this late in the season will push growth that won’t be able to withstand the winter temperatures. 

Compost is another great way to add nutrients to your soil while also improving the soil structure. Add an inch or so at any point in the season. I like to do this in the spring and when I add new plants to my gardens. 


With a pair of pruning shears, a man is trimming the stem of a 'BloomStruck' Hydrangea bush that is covered in vibrant pink and purple flowers. The leaves are green and slightly glossy, providing a nice contrast to the delicate petals. The stem is woody and sturdy, allowing for precise cuts to be made.
Deadheading spent blossoms is recommended, although it is not necessary.

To maintain the beauty of your hydrangeas, deadheading spent blossoms is recommended. You do not need to deadhead your hydrangeas if you do not want to. However, because of the re-blooming quality of the endless summer hydrangeas, removing the spent blossoms allows the newer blossoms to shine.


Wearing red gardening gloves, a man is carefully pruning a 'BloomStruck' Hydrangea plant. The flowers have a blue color, and appear to be in full bloom. The leaves are glossy and green, providing a beautiful backdrop to the colorful blooms. The stem is thick and sturdy, allowing for a clean cut to be made.
BloomStruck® hydrangeas don’t need frequent pruning; if necessary, do it in spring.

This variety does not need to be pruned frequently. However, if you need to clean up and do some pruning, the best time to prune is in the spring.

This is the exception to the rule for pruning bigleaf hydrangeas. Endless summer hydrangeas bloom on old and new wood, making the pruning a bit more complicated.

In the spring, when you begin to see new leaves appearing at the base of the plant, you can prune some of the older and woodier stems. Be careful and take your time. DO NOT prune the green, soft buds! Instead, prune away brown and crunchy buds as well as woody stems. 

Changing Their Color

A close-up of 'BloomStruck' Hydrangea flowers is presented. The flowers are a lovely shade of purple, and their petals are densely packed together. The stems are sturdy and red, providing support for the flowers. The leaves are bright green and have a smooth surface, making them an ideal backdrop for the flowers.
The color of blooms depends on the pH level of your soil.

With BloomStruck®, you will either have a combination of blue and purple hydrangea flowers or rose and pink flowers. The pH of your soil is what will determine the color of your blossoms.

  • Lower your pH (more acidic) = more blue and purple
  • Higher soil pH (more alkaline) = pinker flowers

Luckily for all of us, there is a way to alter the color of your bigleaf hydrangea flowers. Start by getting a soil test to determine the pH of your soil. Alternatively, you can wait and observe the flower color when summer rolls around. 

Once you have this information, you can alter your soil’s pH accordingly. Head to your garden center and purchase the appropriate soil amendment. There are many products on the market that are specifically for use in altering your hydrangea flower colors.

If you cannot find these products, apply aluminum sulfate to your soil to make your flowers bluer or lime for pink blossoms. Be sure to read the application rates on the label!


'BloomStruck' Hydrangea flowers are seen covered in tiny aphids. The leaves of the plant are yellowish and show signs of damage, likely due to the pests. The flowers themselves appear to be dry and shriveled, indicating that the plant is struggling to thrive.
You can remove aphids and spider mites by spraying them with water or using neem oil from your local garden center.

This plant does not have too many issues with pests. But, as with any garden plant, you may encounter a few familiar foes throughout the summer. 

Aphids, Japanese beetles, and spider mites are common insects that will munch on your hydrangeas if they can. 

Aphids and spider mites can be removed with the spray from your hose. You can grab some neem oil from your local garden center if this doesn’t work.

Japanese beetles can be knocked into a bucket of soapy water. If Japanese beetles are a big issue, look at your nearby lawn. If you are noticing a lot of grub activity, be sure to treat your lawn. This will help to knock down the beetle population.


A close-up of 'BloomStruck' Hydrangea leaves shows them to be dry and withered, likely due to a fungal disease. The once green and glossy leaves have turned brown and brittle, and they no longer provide the same vibrant backdrop to the flowers. The plant appears to be struggling, and it may require treatment to recover.
This variety stands out from the rest because of its strong resistance to fungal diseases.

Many hydrangeas are known to struggle with fungal diseases. But BloomStruck® has excellent disease resistance, especially when it comes to powdery mildew! This quality makes it a great choice if you live in a humid area where fungal diseases run rampant.

Another way to combat disease is by planting your hydrangeas at the appropriate spacing for their size. They should be planted about 4-5 feet apart from center to center. 

Plant Uses

'BloomStruck' Hydrangeas are among the many garden plants that have been planted in this beautiful outdoor space. The various plants are arranged in a way that creates a stunning visual display, with the Hydrangeas providing pops of pink and purple color. The garden is lush and inviting, and it offers a peaceful retreat for anyone who visits.
The blooms of this hydrangea are exceptional and can enhance the beauty of your flower arrangements.

This hydrangea is pretty when used as a foundation planting or as a hedge. You can also plant BloomStruck® in containers or your cutting garden, as these flowers make excellent additions to your bouquets. 

Frequently Asked Questions

Can I plant BloomStruck® hydrangeas in containers?

Absolutely! BloomStruck® would make a beautiful addition to your container gardens. Planting hydrangeas in large containers is a great option for gardeners who may not have a lot of partial sun in their gardens.

Be sure that your container is very large, it should be twice as wide and deep as the rootball- similar to the hole you would be digging in the garden. Amend your soil before planting your hydrangea by following the instructions on the package.

This is also a really easy way to control the pH of your soil, ultimately resulting in the perfect shade of blue or pink flowers; whichever your heart desires.

Why aren’t my BloomStruck® hydrangeas blooming?

Pruning is typically the reason your hydrangeas are not blooming. Luckily, the BloomStruck® hydrangea does not need much pruning. These hydrangeas are best pruned in the springtime, but if you are not careful you could snip the flower buds right off.

When you are pruning, make sure you are looking closely at what you are removing. Leave the green, soft buds on the plant unless you are willing to sacrifice a few flowers in the name of perfect form.

What are good companion plants for BloomStruck® hydrangeas?

When it comes to planning a garden around BloomStruck® hydrangeas, you want to keep location in mind. These hydrangeas grow best in partially sunny areas, so nearby plants should also be fans of partial sun.

Astilbe, hosta, heuchera, ferns, and pansies would all make excellent choices for companion plantings. Be sure to choose plants that you love – It is your garden, after all!

Final Thoughts 

Adding Endless Summer® hydrangeas is a foolproof way to bump up the drama in your gardens. BloomStruck® happens to be the toughest of the bunch. All of the Endless Summer® varieties are equally beautiful and unique from one another. If you want a beautiful hydrangea with brighter colors, BloomStruck® is for you. 

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