Hydrangeas are a garden favorite, prized for their large, showy blooms and lush foliage. However, different types of hydrangeas have slightly different needs, and choosing the right organic fertilizer is key to helping them thrive. Whether you’re growing bigleaf, panicle, oakleaf, smooth, mountain, or climbing hydrangeas, this guide will help you select the best fertilizer for your plants to promote healthy growth and abundant flowers.
Top Six Types of Hydrangeas Commonly Grown in America.
Before choosing an organic fertilizer, it’s important to know which type of hydrangea you’re growing:
- Bigleaf Hydrangea (Hydrangea macrophylla) – Known for their large, colorful blooms that change based on soil pH (blue in acidic soil, pink in alkaline soil).
- Panicle Hydrangea (Hydrangea paniculata) – Produces cone-shaped white flowers that mature into pink and can thrive in full sun.
- Oakleaf Hydrangea (Hydrangea quercifolia) – Recognizable by its oak-shaped leaves and white blooms that turn pinkish-purple in fall.
- Smooth Hydrangea (Hydrangea arborescens) – Features large, round white or greenish blooms, such as the popular ‘Annabelle’ variety.
- Mountain Hydrangea (Hydrangea serrata) – Similar to bigleaf hydrangeas but more compact and cold-hardy, with blooms that also change color based on soil pH.
- Climbing Hydrangea (Hydrangea anomala subsp. petiolaris) – A vining variety that climbs walls and trellises, producing lacy white flowers.
Best Organic Fertilizers for Hydrangeas
Espoma Organic Holly-tone (4-3-4) – Best for Bigleaf, Oakleaf & Mountain Hydrangeas
An organic fertilizer formulated for acid-loving plants, such as Holly-tone, is the best choice for hydrangeas that thrive in lower pH soil, including bigleaf hydrangeas, oakleaf hydrangeas, and mountain hydrangeas. This slow-release, all-natural fertilizer enhances soil conditions with beneficial microbes and supports strong root development and overall plant health. If your hydrangeas are young, struggling, or need a nutrient boost, Holly-tone is an excellent option.
Espoma Organic Flower-tone (3-4-5) – Best for Maximizing Blooms
For gardeners who want to maximize flower production across all hydrangea varieties, Flower-tone is the ideal choice. With a higher phosphorus content, this fertilizer encourages larger and more vibrant blooms. The added potassium strengthens plants, improving their resilience to environmental stress. If your primary goal is stunning, long-lasting floral displays, Flower-tone is your best bet.
Espoma Organic Plant-tone (5-3-3) – Best for General Growth
A balanced, all-purpose organic fertilizer like Plant-tone provides nutrients for overall plant health. While it’s not specifically formulated for hydrangeas, it can be used if you’re looking for a simple, well-rounded option. However, if flower production is your priority, Flower-tone will yield better results.
Which Espoma Fertilizer Is Best for Your Hydrangeas?
- Bigleaf, Oakleaf & Mountain Hydrangeas: Thrive with Holly-tone to maintain the right soil acidity and overall plant health.
- Panicle & Smooth Hydrangeas: Benefit most from Flower-tone to encourage larger, more colorful flowers.
- Climbing Hydrangeas: Can use Flower-tone for enhanced blooming and Plant-tone for overall vigor.
- General Maintenance: Plant-tone works as a broad-spectrum fertilizer but is not specifically bloom-focused.
Pro Tips for Fertilizing Hydrangeas:
- Test Your Soil First: Conduct a soil test before fertilizing to determine pH levels and nutrient needs. This will help you choose the most effective organic fertilizer.
- Fertilizing Schedule Matters: Feed your hydrangeas in early spring as new growth emerges and again in mid-summer for a second boost.
- Avoid Late-Season Fertilizing: Refrain from fertilizing in late summer or early fall, as this can promote tender new growth that may not harden off before winter, leaving your plants vulnerable to frost damage.
- Consider Soil Amendments: If your soil is too alkaline, adding Espoma Soil Acidifier can help maintain the right pH for blue hydrangea flowers.
- Use a Starter Fertilizer when planting: When planting, we recommend applying a high-quality organic starter fertilizer like Espoma Organic Bio-tone Starter Plus to help give your new plants the nutrients needed for successful establishment and root development.
Where to Buy Espoma Products:
Looking to purchase the right organic fertilizer for your hydrangeas? Find Espoma products at your nearest garden center or online retailer by visiting the Espoma Where to Buy page.
By selecting the right Espoma fertilizer and following best practices, your hydrangeas will thrive, rewarding you with breathtaking beauty season after season. Happy gardening!
Featured Products:
