Fertilizing Hydrangea – How To Get Hydrangea Blooming All Season Long

Hydrangeas are beloved by gardeners for their stunning and bold blooms. These versatile plants can make a powerful statement in any landscape design, but to maximize their potential beauty and vibrancy, proper fertilization is key.

With an understanding of how to provide the right nutrients for your hydrangeas, you can keep them healthy and maintain a vibrant display year after year.

There are a variety of hydrangea species available, and each type may have slightly different requirements when it comes to fertilization. To ensure optimal growth and blooms, it’s helpful to identify the specific species of hydrangea you have in your garden.

Once you know what type of hydrangea you are working with, you can choose the best fertilizer formula, timing, and application methods for your plants.

Understanding the nutritional needs of your hydrangeas is essential to achieve a beautiful and healthy garden. A well-planned fertilization program can address potential deficiencies and support a lush, vibrant display throughout the growing season.

By tailoring your approach to suit the unique needs of your plants, you’ll be rewarded with stunning blossoms that capture the eye and brighten up any garden space.

Know Your Hydrangea

Types of Hydrangea

There are several types of hydrangea to be aware of when planning your garden. These include:

  • Bigleaf hydrangea (Hydrangea macrophylla): The most common type, known for their large, vibrant blooms usually in shades of pink, blue, or purple.
  • Panicle hydrangea (Hydrangea paniculata): These hydrangeas have cone-shaped flower clusters and typically bloom white, turning pinkish-red as the season progresses.
  • Smooth hydrangea (Hydrangea arborescens): Recognized for their round, white flower clusters and hardiness in colder climates.
  • Oakleaf hydrangea (Hydrangea quercifolia): As the name suggests, these plants have oak leaf-shaped foliage and cone-shaped flower clusters that transition from white to deep pink.

Understanding the type of hydrangea you have will help you provide the right care and fertilizer for your plant to achieve healthier blooms.

purple Hydrangea

Understanding Soil pH

The soil pH plays a significant role in hydrangea growth and bloom color. Some hydrangea types, such as bigleaf hydrangeas, change color based on the pH level of the soil. Here is how soil pH affects color in bigleaf hydrangeas:

  • Alkaline soil (pH 6.0-7.0): The hydrangea flowers will be pink or reddish hues.
  • Neutral soil (pH 7.0): The hydrangea flowers will be purple.
  • Acidic soil (pH 4.5-6.0): The hydrangea flowers will be blue.

To determine the pH of your soil, you can use at-home soil testing kits available at garden centers. Once you know your soil’s pH level, you can adjust it, if necessary, using soil amendments like lime (to raise pH) or sulfur (to lower pH). This understanding of your hydrangea’s preferred conditions will help you make more informed decisions when it comes to fertilizing and maintaining healthy plants.

Choosing the Right Fertilizer

When it comes to fertilizing hydrangeas, choosing the right fertilizer is essential for promoting healthy growth and vibrant blooms. There are various types of fertilizers available, each with its own benefits and drawbacks. In this section, we’ll discuss two primary categories of fertilizers: chemical fertilizers and organic options.

Chemical Fertilizers

Chemical fertilizers are widely available and provide a quick boost of essential nutrients to your hydrangeas. When selecting a chemical fertilizer for hydrangeas, consider using one that has a balanced ratio of nitrogen, phosphorus, and potassium (N-P-K) for optimal growth. Some popular choices include:

  • 10-10-10: This all-purpose fertilizer contains equal amounts of nitrogen, phosphorus, and potassium.
  • 12-4-8: A fertilizer with a higher nitrogen content, this option can help promote lush foliage growth in addition to blooms.

To ensure that your hydrangeas receive the correct amount of nutrients, carefully follow the application instructions provided on the fertilizer packaging.

Organic Options

For gardeners who prefer a more eco-friendly approach, there are several organic fertilizer options available. These options can help improve soil health and promote strong root development while providing vital nutrients to your hydrangeas.

  • Compost: Incorporating compost into the soil around your hydrangeas is an excellent way to deliver necessary nutrients while improving soil structure.
  • Fish emulsion: Rich in nitrogen, this fast-acting liquid fertilizer can be easily applied around the base of your plants.
  • Bone meal: A good source of phosphorus, bone meal encourages strong root growth and can be mixed into the soil or sprinkled around the base of your hydrangeas.

Regardless of which type of fertilizer you choose, be sure to apply it during the appropriate times: early spring, late spring, and midsummer are ideal for fertilizing hydrangeas. By selecting the right fertilizer and applying it correctly, you’ll be well on your way to a thriving hydrangea garden with an abundance of beautiful blooms.

When to Fertilize

The timing of fertilizing hydrangeas is crucial for their overall health and flowering. Deciding when to fertilize depends on whether you’re working with established plants or newly planted hydrangeas.

Established Plants

For established hydrangeas, it’s generally best to fertilize them in two main stages:

  • Early spring: Apply the first round of fertilizer once the plant is out of dormancy and starts actively growing, typically around late March to early April. It’ll give the hydrangea a good boost for the growing season ahead.
  • Late spring: The second round of fertilizer should be applied around 4-6 weeks after the initial feeding. This occurs around late May to early June, just before the plant starts blooming, helping it develop strong roots and vibrant blooms.

Keep in mind that over-fertilizing can lead to more foliage growth and less flowering, so it’s essential to stick to the recommended schedule and not to apply too much fertilizer as well.


Newly Planted Hydrangeas

For newly planted hydrangeas, here’s how to fertilize them:

  • After planting: Once you’ve planted the hydrangea, apply a slow-release granular fertilizer or an organic fertilizer like compost or well-rotted manure. This will provide the nutrients needed for initial establishment.
  • Following year: Treat your new hydrangea as an established plant by following the early and late spring fertilization schedule mentioned above.

Remember that different varieties of hydrangeas might have specific requirements. Always check the label or ask for advice at the nursery where you purchased your plant to ensure you’re giving your hydrangea the best possible care.

How to Apply Fertilizer

Granular Application

Applying granular fertilizer to your hydrangea is a simple process. Before beginning, make sure you follow the manufacturer’s instructions on the fertilizer package. Start by measuring the fertilizer according to the recommended dosage.

Next, evenly distribute the granular fertilizer around the root zone of the hydrangea plant. This will allow the nutrients to be easily absorbed by the roots. Be sure to keep it a few inches away from the main stem to avoid potential damage or burn. Then, gently mix the granules into the top layer of soil using a rake or your hands. This will ensure that it is well-incorporated and ready for use by your hydrangea plant.

After applying the fertilizer, water the area thoroughly. This step is crucial, as it will help to dissolve the fertilizer and bring the nutrients to the roots.

Liquid Feeding

If you prefer using a liquid fertilizer for your hydrangea plants, make sure you have the appropriate equipment for mixing and applying the liquid feed. This includes a watering can or a hose-end sprayer, as well as a bucket for mixing the solution.

Begin by mixing the liquid fertilizer according to the manufacturer’s instructions. The specific concentration and application rates may vary depending on the brand and formulation, so be sure to follow these guidelines closely.

Once the fertilizer is properly mixed, apply it evenly to the hydrangea plant, focusing on the root zone. As with the granular application, avoid getting the liquid fertilizer directly on the stem of the plant. This can cause damage or even burn the plant.

To finish, water the area thoroughly to help distribute the liquid fertilizer into the soil. This will ensure that your hydrangea plant gets the best uptake of nutrients from the fertilizer, promoting healthy growth and beautiful blooms.

Fertilizer Tips for Specific Hydrangea Types

Bigleaf Hydrangeas

Bigleaf Hydrangeas (Hydrangea macrophylla) are among the most popular hydrangea varieties. They generally prefer a slightly acidic soil with a pH between 5.5 and 6.5. To maintain this pH and acidity, choose a fertilizer specifically designed for acid-loving plants, such as a 10-10-10 or 12-4-8 granular fertilizer with added micronutrients. Apply fertilizer in early spring, and if needed, a light feeding in mid-summer. Over-fertilizing can cause excessive leaf growth and reduced bloom production. To encourage vibrant bloom colors, consider adding aluminum sulfate or a soil acidifier for blue blooms, or apply garden lime for pink blooms.

Panicle and Smooth Hydrangeas

Panicle hydrangeas (Hydrangea paniculata) and Smooth hydrangeas (Hydrangea arborescens) are more adaptable to various soil conditions but still appreciate some care. A slow-release, balanced fertilizer/soil amendment, such as a 10-10-10 or 14-14-14, works well for these varieties. Fertilize once in early spring, as new growth emerges.

For both Panicle and Smooth hydrangeas, it’s essential to keep the soil consistently moist during the growing season. A layer of organic mulch around the base of the plant will help maintain soil moisture and temperature, while also adding essential nutrients over time.

Remember to always water thoroughly after fertilizing to help distribute the nutrients evenly around the roots and prevent fertilizer burn.


What to Avoid


Fertilizing your hydrangea should be done with care and attention. It’s crucial to avoid over-fertilizing, as this can lead to damaged roots and unappealing foliage. To prevent over-fertilizing, it’s best to:

  • Follow the recommended application rates on the fertilizer label, ensuring that you’re providing just the right amount for your plants.
  • Time your applications properly by only fertilizing during the growing season, typically in early spring and late summer.

Excessive Nitrogen

Hydrangeas require a balanced nutrient mix to thrive, so it’s important to avoid excessive nitrogen. Too much nitrogen can cause lush, green leaves at the expense of blooms and overall plant health. To strike the right balance, keep these tips in mind:

  • Choose a balanced fertilizer designed for hydrangeas, which typically have a 10-10-10 or 12-4-8 NPK ratio (Nitrogen, Phosphorus, and Potassium).
  • Monitor your soil’s nitrogen levels with a soil test to determine if additional nitrogen is needed or if adjustments should be made to your fertilizing approach.

By avoiding over-fertilizing and excessive nitrogen, you will promote healthy hydrangeas with vibrant, long-lasting blooms.

Monitoring Your Hydrangea’s Progress

Keeping a close eye on your hydrangea’s progress will allow you to catch potential issues early on and ensure that your plant is getting the nutrients it needs.

When monitoring your hydrangea, make note of the following:

  • Leaf color: A healthy hydrangea’s leaves should be a vibrant green. Pale or yellowing leaves may indicate a nutrient deficiency, while brown or wilting leaves can be a sign of over-fertilizing or another problem.
  • Flower color: One of the unique aspects of hydrangeas is their ability to change flower color based on the pH level of the soil. Pink flowers indicate alkalinity, while blue flowers signal acidity. If you notice an undesired color change, you may need to adjust the soil pH by adding acidifying or alkalizing amendments. Keep in mind that white hydrangeas will maintain their color regardless of soil pH.
  • Flower abundance: If your hydrangea doesn’t produce many flowers or has weak blooms, it may be lacking nutrients. Inadequate sunlight or pruning mistakes may also contribute to this issue.
  • Growth rate: Limited growth could suggest that your hydrangea requires more nutrients, but it might also indicate overcrowding, improper pruning, or poor soil conditions.

Regularly monitoring your hydrangea’s progress can help you address any concerns and keep it healthy. Paying attention to these factors and adjusting your care routine accordingly will ensure your hydrangea receives the appropriate nutrients and flourishes.



In conclusion, fertilizing hydrangeas is an essential practice to ensure their health and enhance their flowering potential. By following the tips mentioned in this article, you will help your hydrangeas thrive and reach their full potential.

To summarize, it’s necessary to:

  • Understand the needs of your specific hydrangea variety
  • Choose a high-quality fertilizer with the right N-P-K ratio
  • Apply it at the right time in the growing season
  • Properly water the plant to avoid root damage

Remember, a friendly gardener always pays attention to the needs of their plants, so carefully observe their growth to know if any adjustments to your care are needed. Happy gardening!