Endless Summer® hydrangeas are reblooming hydrangeas that flower repeatedly throughout the season. Using the right hydrangea fertiliser in spring and early summer helps encourage healthy growth and continuous blooms from spring until autumn.
Unlike many traditional hydrangeas, Endless Summer® hydrangeas bloom on both old and new wood, allowing them to rebloom throughout the season. With the right care and feeding, these hydrangeas can produce fresh flowers repeatedly, delivering non-stop new flowers until winter.
In this guide, you’ll discover when to fertilise hydrangeas, which fertiliser works best and how to encourage stronger growth and more flowers throughout the growing season.
Why Is Fertilising Hydrangeas Important?
Hydrangeas use a lot of energy to produce their large flowers and healthy green foliage. Regular feeding helps provide the nutrients needed for continuous growth and reblooming.
Fertilising hydrangeas can help:
- encourage new flower production;
- support strong roots and healthy stems;
- improve plant vigour and resilience;
- extend the flowering season;
- promote reblooming throughout summer.
Reblooming hydrangeas such as Endless Summer® especially benefit from additional nutrients because they continue producing new flower buds throughout the season.
Soil Improvement vs Fertilising: What’s the Difference?
Although often confused, improving the soil and fertilising hydrangeas are two different things.
Improving the Soil
Soil improvement focuses on enhancing soil structure and drainage. This is especially useful if your garden has:
- heavy clay soil;
- dry sandy soil;
- poor or compacted ground.
Adding compost or organic matter helps improve moisture retention, drainage and nutrient absorption.
Fertilising Hydrangeas
Fertilising provides essential nutrients such as nitrogen, phosphorus and potassium to support healthy plant growth and flower production.
Healthy soil and proper feeding work together to create stronger hydrangeas with more blooms.
Can Soil Affect Hydrangea Flower Colour?
Yes, soil conditions can influence the flower colour of some hydrangea varieties, including several Endless Summer® hydrangeas.
- Acidic soil generally encourages blue flowers.
- Alkaline or lime-rich soil usually produces pink flowers.
Soil conditions vary across Europe and the UK, so flower colour may naturally differ depending on your location.
If you would like to adjust your hydrangea colour, you can use products designed for blue hydrangeas or add garden lime to encourage pink tones.
What Is the Best Fertiliser for Hydrangeas?
For best results, choose:
- a slow-release fertiliser;
- a fertiliser designed for hydrangeas or flowering shrubs;
- a balanced bloom booster that releases nutrients gradually.
Slow-release fertilisers provide steady feeding over time and help support continuous flowering without encouraging excessive leaf growth.
Endless Summer® hydrangeas are bred for continuous flowering, producing Non-Stop new blooms throughout the season. Using the right fertiliser helps support this natural reblooming habit.
Can You Overfertilise Hydrangeas?
Yes. Too much fertiliser can cause hydrangeas to produce lots of leaves but fewer flowers. Always follow the dosage instructions on the packaging and avoid applying excessive fertiliser, especially late in the season.
When Should You Fertilise Hydrangeas?
Fertilise Hydrangeas in Spring
Apply the first feed in spring as soon as new green growth appears. Depending on the climate, this is usually between March and April in most parts of Europe and the UK.
New growth may appear at the base of the plant or along the stems.
Apply the fertiliser around the base of the hydrangea and water thoroughly afterwards.
Fertilise Hydrangeas Again in Early Summer
A second application in late June or early July helps encourage fresh blooms later in the season. Reblooming hydrangeas such as Endless Summer® respond especially well to this second feed because they continue developing new flower buds throughout summer. Removing spent flowers at the same time can also help encourage reblooming.
How to Encourage More Hydrangea Blooms
To keep your hydrangeas healthy and flowering for longer:
- water regularly during dry weather;
- apply mulch to help retain moisture;
- avoid overfeeding;
- prune carefully depending on the hydrangea variety;
- avoid strong lawn fertilisers near hydrangeas;
- stop fertilising after late July so the plant can prepare for winter.
Proper care combined with regular feeding helps Endless Summer® hydrangeas continue flowering for months. Enjoy Non-Stop Blooms with Endless Summer®
With the right fertiliser and care, Endless Summer® hydrangeas will reward you with beautiful blooms throughout the growing season. Whether planted in borders, containers or cottage gardens, these reblooming hydrangeas provide reliable colour and long-lasting performance year after year. Non-Stop new flowers, until winter. Year after year.
FAQ about Fertilising Hydrangeas
A slow-release fertiliser designed for hydrangeas or flowering shrubs is ideal for supporting healthy growth and continuous blooming.
Most hydrangeas benefit from being fertilised twice a year — once in spring and again in early summer.
Yes. Overfertilising can lead to excessive leaf growth and fewer flowers.
Yes. Endless Summer® hydrangeas bloom on both old and new wood, allowing them to rebloom continuously throughout the growing season.