Bloomstruck Hydrangea: A Color-Changing Blue/Pink/Purple Hydrangea

With so many types of hydrangea to choose from, it can be hard to select the right one for your garden. That said, there are a few all-time favorites, and the Bloomstruck Hydrangea is certainly one of them.

Bloomstruck Hydrangea is a cultivar of Hydrangea macrophylla known for its large vibrant flowers, which range in color from pink to purple and even blue, depending on the acidity of the soil. These compact flowering shrubs are a re-blooming type of hydrangea, growing flowers both on old overwintered wood and new spring growth. These low-maintenance plants are absolutely stunning in the garden and home landscape.

Read on to learn all about Bloomstruck Hydrangeas!

Bloomstruck Hydrangeas: The Basics

The Bloomstruck Hydrangea is a deciduous flowering shrub with mophead hydrangea flowers (Hydrangea macrophylla). They typically bloom from July to August but can bloom slightly earlier in the spring if the conditions are correct. BloomStruck® Hydrangea is sold by Endless Summer® hydrangeas.

The Bloomstruck Hydrangeas grow flowers in large bunches. This type of hydrangea is well known because the color of the flowers can change color based on the pH level of the soil. The flowers on the Bloomstruck Hydrangea can be violet, blue, or pink. Adding lime to soil can encourage the Bloomstruck plant to grow pink flowers, while adding sulphur to the soil can encourage growth of blue flowers.

The reddish-purple branches are largely covered by the dark green leaves, especially during the summer months. Branches set overwintering flower buds in the fall, which then bloom early the next spring. This plant is a reblooming type of hydrangea, and also grows flower buds on fresh green spring stems.

Bloomstruck Hydrangea Flower

If you want to change the color of the flowers on the Bloomstruck Hydrangea in your garden, you can mix aluminum sulfate or lime into the soil in the fall or early spring, before winter comes and the flowers bloom in the summer. If you want the Bloomstruck Hydrangea flowers to be blue, add aluminum sulfate. If you want the Bloomstruck Hydrangea flowers to be pink, add lime to the soil. You can create the colors you want to see in your garden!

Bloomstruck Hydrangea grows to be 3 to 4 feet tall and can grow to be 4 to 5 feet wide. These are plants that take up a large amount of space, so make sure that when you plant Bloomstruck Hydrangeas, you do not plant them too close to each other. If you plant two of these plants too close together, they will grow into each other and look very squished. It’s also possible that their growth will be stunted. You also will not be able to see all of the flowers, which would be unfortunate.

Bloomstruck Hydrangea Flowers - Pink

Bloomstruck Hydrangea Plants

Here are some nurseries that offer Bloomstruck Hydrangea plants:

BloomStruck® Hydrangea is an Endless Summer® bigleaf hydrangea cultivar.

How To Plant Bloomstruck Hydrangeas

It is very easy to plant Bloomstruck Hydrangeas . They grow best when they are in partial shade, but they will grow while in full sun where the sun is not overly harsh and the plant is well-watered. In very warm climates, it is best to plant bloomstruck hydrangeas in partial shade rather than full sun because the flowers can become dry or scorched if they are in direct sunlight for too long in dry climates.

When you plant a Bloomstruck Hydrangea, dig a hole that is large enough to cover the root ball, and place your hydrangea into the hole. Make sure that you plant your Bloomstruck Hydrangea in soil that drains well and is fertile so your plant has enough nutrients to grow.

After you cover the root ball in soil, water the area around the Bloomstruck Hydrangea until the soil is moist, but not wet. If you do not want to water your hydrangea frequently, or do not want to check the soil often, add mulch to the top of the soil. The mulch will help preserve the moisture in the soil so you can water your Bloomstruck Hydrangea less frequently.

You should see your Bloomstruck Hydrangea bloom during the summer after you have planted it, but don’t be worried if it does not bloom in the same year that you planted it. It may need some time to get used to its new environment, or you may have planted it too late in the season for it to properly bloom on time. This is a perennial plant that will be back next year, so you can look forward to it blooming then.

Changing The Color Of Bloomstruck Hydrangea Flowers

Flower color depends on the pH of the soil in contact with plant roots. To change the color of Bloomstruck Hydrangea blooms, add either an acidic or an alkaline amendment to the soil around the plant.

  • Add lime to soil for pink flowers
  • Add sulphur to the soil for blue flowers
Bloomstruck Hydrangea - purple

Pruning Bloomstruck Hydrangea

You do not have to prune Bloomstruck Hydrangeas, but doing so can promote new blooms, especially if the winter season was harsh on the plant and overwintered buds have died. If you do want to prune your Bloomstruck Hydrangea after a harsh winter, do so in the late winter or early spring, before the growing season begins.

Routine pruning of Bloomstruck Hydrangea is best done right after the blooms have finished in the summertime. This allows the plant to set new buds in the fall which will overwinter for an early spring show of flowers. If you want to keep the Bloomstruck Hydrangea flowers, cut the branch that supports the flowers where two branches meet. This will not damage the rest of the Bloomstruck Hydrangea, and may even promote new growth.

Mary Jane Duford

Mary Jane is a home gardener who loves creating healthy, welcoming spaces (indoors and out!) - About Mary Jane (

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