Best Reblooming Hydrangea – Unlock Continuous Blooms All Season Long

ByRimon Chowdhury Updated on

Oh, the timeless charm of hydrangeas! We all adore their magnificent, globe-like blooms or delicate lacecap clusters. But let’s be honest, there’s nothing quite as disappointing as a hydrangea that gives you one spectacular show and then calls it a season. If you’ve ever yearned for a garden filled with vibrant hydrangea flowers from spring until fall, you’re in the right place.

You see, many traditional hydrangeas bloom only on “old wood”—the stems that grew the previous year. A harsh winter or an ill-timed prune can easily wipe out an entire year’s worth of flowers. But what if I told you there’s a secret to endless summer color?

That’s where the best reblooming hydrangea varieties come in! These botanical marvels are bred to bloom not just on old wood, but also on “new wood” that grows in the current season. This means more flowers, a longer blooming period, and much more resilience against unexpected weather or pruning mishaps. This guide will walk you through everything you need to know, from selecting the perfect variety to mastering their care, ensuring your garden bursts with continuous hydrangea splendor.

Understanding Reblooming Hydrangeas: The Science of Continuous Color

Before we dive into specific varieties, let’s chat a bit about what makes a reblooming hydrangea so special. It’s truly a game-changer for gardeners!

Most rebloomers are cultivars of Bigleaf Hydrangea (Hydrangea macrophylla) or Mountain Hydrangea (Hydrangea serrata). These incredible plants possess the genetic ability to produce flower buds on both the previous year’s growth (old wood) and the current year’s growth (new wood).

This “new wood” blooming trait is what gives them their common name: everblooming hydrangeas. If the initial flush of blooms on old wood gets damaged by a late frost or you prune incorrectly, don’t despair! The plant will simply produce new stems and new flower buds throughout the summer, giving you a second, third, or even fourth wave of blossoms.

Old Wood vs. New Wood: Why It Matters

Traditional hydrangeas, like many heirloom Bigleaf types, only bloom on old wood. This makes them vulnerable.

  • Old Wood Bloomers: Flower buds form in late summer or early fall on the stems that have grown that year. These buds then overwinter and open the following spring/summer. If winter is too cold, or if you prune in late fall, winter, or early spring, you risk cutting off all those precious buds.

  • New Wood Bloomers (Rebloomers): These form flower buds on stems that emerge in the current spring. This means even if the old wood dies back or is pruned, new growth will still produce flowers later in the season. It’s a fantastic insurance policy for consistent color!

Many of the best reblooming hydrangea varieties offer the best of both worlds, blooming on both old and new wood. This ensures an early summer display from old wood and a continuous show into fall from new wood.

Choosing the Best Reblooming Hydrangea Varieties for Your Garden

Now for the fun part: picking your plants! There are many fantastic choices, each with unique characteristics. Here are some of my personal favorites that consistently deliver:

1. ‘Endless Summer’ Hydrangea Series

This is arguably the series that revolutionized the hydrangea world, making the phrase “best reblooming hydrangea” a household term. ‘Endless Summer Original’ was the first widely available reblooming Bigleaf Hydrangea, and the series has expanded beautifully.

  • ‘Endless Summer Original’: Classic mophead blooms, usually pink in alkaline soil and blue in acidic soil. Reliable and robust.

  • ‘BloomStruck’: Known for its incredibly strong, reddish-purple stems and deep green leaves with red petioles. The flowers are vibrant rose-pink or blue-purple, depending on soil pH. It’s more compact and heat tolerant.

  • ‘Twist-n-Shout’: A stunning lacecap variety with intense pink or periwinkle blue flowers. Its sturdy red stems add year-round interest. It’s a real showstopper!

  • ‘Summer Crush’: Features rich raspberry red or deep purple blooms, making it a standout. It’s also more compact, perfect for smaller spaces or containers.

2. ‘Let’s Dance’ Hydrangea Series

Another excellent series by Proven Winners, ‘Let’s Dance’ varieties are known for their strong stems, vibrant colors, and consistent reblooming performance. They tend to be a bit more compact than some ‘Endless Summer’ varieties, making them ideal for smaller gardens.

  • ‘Let’s Dance Rhythmic Blue’: Offers beautiful deep blue or pink mophead flowers, depending on your soil. It has a lovely dense habit.

  • ‘Let’s Dance Can Do!’: This Mountain Hydrangea (Hydrangea serrata) hybrid is particularly hardy and boasts vivid pink or blue lacecap flowers. It’s a great choice if you’re in a colder zone.

3. ‘Invincibelle’ Hydrangea Series (Smooth Hydrangea)

While most rebloomers are Bigleaf or Mountain types, the ‘Invincibelle’ series offers reblooming Smooth Hydrangeas (Hydrangea arborescens). These are incredibly hardy, reliable, and produce huge, long-lasting flowers, often in shades of pink or white.

  • ‘Invincibelle Spirit II’: Features lovely pink mophead flowers that mature to a darker rose. It’s very cold-hardy and blooms reliably year after year.

  • ‘Invincibelle Wee White’: A dwarf variety perfect for containers or front borders, producing abundant white flowers that age to soft pink. Don’t worry—these flowers are perfect for beginners!

When selecting, always check the plant tag for mature size, hardiness zone, and specific light requirements to ensure it’s a good fit for your garden.

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Site Selection and Planting Your Reblooming Hydrangea

Getting your hydrangea off to a good start is crucial for continuous blooms. Proper site selection and planting make all the difference.

Ideal Location and Light Conditions

Reblooming hydrangeas thrive in a spot that receives part shade. This usually means morning sun and afternoon shade, especially in warmer climates.

Too much direct sun, particularly the intense afternoon sun, can scorch their leaves and cause flowers to fade quickly. Too much shade, on the other hand, can reduce flowering and lead to leggy growth.

Think about the spot in your garden that gets about 4-6 hours of sun, ideally in the morning. A location near a deciduous tree that provides dappled shade in summer is often perfect.

Preparing the Soil

Hydrangeas prefer rich, well-draining soil. They don’t like “wet feet,” so avoid areas where water tends to pool.

  1. Test Your Soil: If you can, do a simple soil test. Hydrangeas love slightly acidic to neutral soil (pH 5.5-7.0). For blue flowers on Bigleaf varieties, you’ll need acidic soil (below 6.0 pH) and aluminum sulfate. For pinks, aim for more alkaline soil (above 6.0 pH) with garden lime.

  2. Amend the Soil: Dig a hole twice as wide as the root ball and just as deep. Mix in plenty of organic matter like compost, aged manure, or peat moss. This improves drainage and provides essential nutrients.

Planting Steps

Planting is straightforward, but a few details ensure success.

  • Remove from Container: Gently slide the plant out of its nursery pot. If the roots are circling tightly, tease them apart with your fingers.

  • Positioning: Place the plant in the hole so that the top of the root ball is level with or slightly above the surrounding soil. This helps prevent crown rot.

  • Backfill: Fill the hole with your amended soil, gently tamping down to remove large air pockets. Avoid burying the stem too deeply.

  • Water Thoroughly: Give your newly planted hydrangea a deep, slow watering. This settles the soil around the roots.

  • Mulch: Apply a 2-3 inch layer of organic mulch (like shredded bark or pine needles) around the base of the plant, keeping it a few inches away from the stem. Mulch helps retain moisture, regulate soil temperature, and suppress weeds.

Essential Care for Abundant Flowers

Once planted, your reblooming hydrangea needs consistent care to keep those flowers coming. It’s not difficult, but attention to detail pays off big time!

Watering Wisely

Hydrangeas are thirsty plants, especially when establishing and during dry spells. The name “hydra” in hydrangea is a clue!

Aim for deep, consistent watering. Instead of frequent shallow sprinkles, water deeply two to three times a week, ensuring the soil is moist several inches down. You can check this by sticking your finger into the soil. In hot, dry weather, they might need daily watering, especially if they are in containers.

Fertilizing for Flower Power

A balanced fertilizer can encourage more blooms. Don’t overdo it, though, as too much nitrogen can promote leafy growth at the expense of flowers.

Apply a slow-release granular fertilizer formulated for flowering shrubs in early spring, just as new growth begins. Look for a fertilizer with a slightly higher phosphorus content (the middle number in the NPK ratio, e.g., 10-20-10). Avoid fertilizing late in the season, as this can stimulate tender new growth that won’t harden off before winter.

Managing Soil pH for Color Change

For Bigleaf and Mountain Hydrangeas, soil pH dictates flower color:

  • Blue Flowers: Requires acidic soil (pH 5.5 or lower) and the presence of aluminum. You can acidify soil with elemental sulfur or peat moss, and add aluminum sulfate for the blue pigment. Apply in early spring.

  • Pink Flowers: Requires alkaline soil (pH 6.0 or higher) and the absence of aluminum. Add garden lime to raise pH. For truly vibrant pinks, you might need to limit aluminum uptake.

Changing flower color takes time and consistent effort. Remember, white hydrangeas (like ‘Invincibelle Wee White’) will always stay white, regardless of soil pH.

Pruning Your Reblooming Hydrangea for Repeat Performance

Pruning reblooming hydrangeas is much less stressful than with old-wood bloomers. Since they bloom on both old and new wood, a mistaken cut won’t cost you an entire season of flowers.

When to Prune

The best time to prune most reblooming Bigleaf and Mountain Hydrangeas is after their first flush of blooms in early summer. This encourages new growth that will produce more flowers later in the season.

You can also do some light shaping or remove dead/damaged branches in late winter or early spring before new growth truly emerges. Avoid heavy pruning after mid-summer, as it might remove developing flower buds for the next season’s old-wood blooms.

How to Prune

  1. Deadheading: This is the most common and beneficial pruning task. Once a flower fades, snip it off just above the first set of healthy leaves or a developing bud. This signals the plant to put energy into producing more flowers, not seeds. This is key to maintaining a long season of blooms from the best reblooming hydrangea plants.

  2. Removing Dead or Damaged Wood: Anytime you see dead, diseased, or broken branches, cut them back to healthy wood or to the ground. This improves plant health and air circulation.

  3. Shaping and Rejuvenation: If your plant becomes too large or leggy, you can remove up to one-third of the oldest, thickest stems right down to the ground in late winter/early spring. This encourages fresh, vigorous growth. This is called rejuvenation pruning and is a pro tip for maintaining shrub vitality.

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Always use sharp, clean pruning shears to make clean cuts and prevent disease.

Troubleshooting Common Issues

Even the most resilient reblooming hydrangeas can encounter a few hiccups. Here’s how to address common problems:

No Blooms or Sparse Flowering

This is probably the most frustrating issue. Here’s what to check:

  • Too Much Shade: If your plant isn’t getting at least 4-6 hours of sun, it might struggle to produce flowers. Consider transplanting it to a sunnier spot.

  • Over-Fertilization: Too much nitrogen (the first number in the NPK ratio) promotes leafy growth at the expense of flowers. Switch to a fertilizer with higher phosphorus.

  • Winter Damage: Even rebloomers can have their old wood buds damaged by extreme cold. The good news is new wood should still produce blooms later.

  • Pruning Errors: While more forgiving, heavy pruning late in the season can remove developing new wood buds. Stick to deadheading and light shaping after early summer.

  • Immature Plant: Sometimes, young plants just need a year or two to establish a strong root system before they start blooming profusely.

Pests and Diseases

Reblooming hydrangeas are generally quite resistant, but keep an eye out for:

  • Aphids: Small, soft-bodied insects that cluster on new growth. A strong spray of water or insecticidal soap can usually control them.

  • Powdery Mildew: A white, powdery coating on leaves, especially in humid conditions with poor air circulation. Ensure good spacing between plants and consider a fungicide if severe.

  • Leaf Spot: Various fungal spots can appear. Remove affected leaves and ensure good air circulation.

Healthy, well-cared-for plants are always more resilient to pests and diseases.

Wilting Leaves

Wilting is almost always a sign of insufficient water. Check the soil moisture. If it’s dry, water deeply. If it’s soggy, you might have root rot, which is more serious. Ensure good drainage during planting to prevent this.

Frequently Asked Questions About Reblooming Hydrangeas

Do reblooming hydrangeas need winter protection?

While many rebloomers are hardy, protecting them in colder zones (like zone 5) can help preserve old wood blooms for an earlier show. Apply a thick layer of mulch around the base in late fall, and consider covering smaller plants with burlap or a breathable frost cloth during extreme cold snaps. For container plants, move them to a sheltered location like an unheated garage.

How long do reblooming hydrangeas bloom?

They typically start blooming in late spring to early summer on old wood, and then continue to produce new flushes of flowers on new wood until the first hard frost in fall. This can mean continuous blooms for 3-5 months or even longer in ideal conditions.

Can I grow reblooming hydrangeas in containers?

Absolutely! Many compact varieties, especially from the ‘Endless Summer’ and ‘Let’s Dance’ series, are excellent choices for containers. Just be sure to use a large pot with good drainage, water more frequently, and consider bringing the container into a sheltered, unheated space for winter in colder climates.

What’s the difference between a Bigleaf and a Mountain Hydrangea rebloomer?

Bigleaf Hydrangeas (H. macrophylla) are more common, with larger leaves and either mophead or lacecap flowers. Mountain Hydrangeas (H. serrata) are typically smaller, more cold-hardy, have finer texture, and usually feature lacecap flowers. Both types offer excellent reblooming varieties, but Mountain Hydrangeas tend to be a bit more robust in colder zones.

Why aren’t my reblooming hydrangeas changing color?

Several factors can affect color change. First, ensure your hydrangea is a Bigleaf or Mountain variety, as Smooth and Panicle hydrangeas don’t change color. Second, soil pH adjustments take time and consistent application. It can take a full season or two to see significant changes. Also, the presence of aluminum in the soil is crucial for blue colors, regardless of pH. Make sure your soil has sufficient aluminum if you’re aiming for blue.

Ready to Embrace Continuous Color?

There you have it, fellow gardeners! The secret to a summer filled with vibrant, long-lasting hydrangea blooms is simply choosing the best reblooming hydrangea varieties and giving them a little love. These resilient plants are a testament to modern breeding, making continuous color accessible and enjoyable for everyone.

From the classic ‘Endless Summer’ to the hardy ‘Invincibelle’ series, there’s a perfect rebloomer waiting to grace your garden. With the right site, consistent watering, minimal pruning, and a keen eye for any issues, you’ll be enjoying a spectacular display from spring until fall. So, go forth, choose your favorite, and prepare to be amazed by the endless beauty these incredible hydrangeas bring!

Rimon Chowdhury
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