Hydrangea Identification Chart: 6 Types Made Easy

A hydrangea identification chart can save you a lot of guessing when you’re trying to figure out what kind of hydrangea is growing in your yard.

Flower shape is usually the first clue, but don’t stop there. Look at the leaves, the shape of the plant, when it blooms, and whether the flowers grow on brand new stems or stems that have been on the plant since the last growing season.

That last part is especially important because identifying your hydrangea can keep you from pruning at the wrong time and accidentally cutting off next year’s flowers.

Quick Answer

Our hydrangea identification chart covers six common types: bigleaf, panicle, smooth, oakleaf, mountain, and climbing hydrangeas.

Round mophead flowers often point toward bigleaf or smooth hydrangeas. Cone-shaped flowers are common on panicle and oakleaf hydrangeas. Oak-shaped leaves make oakleaf hydrangeas easy to spot, while climbing hydrangeas grow as woody vines instead of shrubs.

Use several clues together instead of relying on flower color alone.

Hydrangea Identification Chart at a Glance

Keep this hydrangea identification chart handy as you walk through the yard. One clue may narrow it down, but two or three clues usually make identification much easier.

How to Use This Hydrangea Identification Chart

Start with the flowers if your hydrangea is blooming.

Ask yourself:

Are the flowers round?

Are they flat with tiny flowers in the center?

Are they long and cone-shaped?

Then look at the leaves.

Bigleaf hydrangeas usually have broad, oval leaves with toothed edges.

Oakleaf hydrangeas have deeply lobed leaves that look much more like an oak tree leaf.

Mountain hydrangeas tend to have smaller leaves than bigleaf hydrangeas.

Panicle hydrangeas usually have more pointed leaves and elongated flower clusters.

You can also pay attention to the plant itself.

If it looks like a woody vine climbing a wall or tree, you probably have a climbing hydrangea rather than one of the common shrub types.

The University of Georgia Cooperative Extension guide to identifying hydrangeas also stresses identifying the species before deciding how and when to prune.

That’s a big reason we think learning the type is worth the effort.

Hydrangea Identification Chart: Bigleaf Hydrangea

Bigleaf hydrangea (Hydrangea macrophylla) is probably what most people picture when they hear the word hydrangea.

These are the classic shrubs with large blue, pink, purple, or white flowers.

Bigleaf hydrangeas usually produce one of two flower forms.

Mophead Bigleaf Hydrangeas

Mopheads have large rounded flower clusters.

Think of varieties such as Endless Summer®, Summer Crush®, and many of the traditional blue or pink hydrangeas commonly planted around homes.

Their leaves are usually large, broad, and somewhat glossy with toothed edges.

Lacecap Bigleaf Hydrangeas

Lacecaps look different even though they can be the same species.

Instead of a completely rounded ball of showy flowers, lacecaps have smaller fertile flowers in the center surrounded by larger showy flowers around the outside.

Traditional bigleaf hydrangeas bloom on old wood.

Old wood means growth that has been on the plant since the last growing season. Many bigleaf hydrangeas begin forming the buds for next year’s flowers during late summer and fall.

Some newer reblooming bigleaf hydrangeas can bloom on both old and new growth.

If you think you have a bigleaf hydrangea, our old wood vs. new wood hydrangea guide can help you figure out when it is safe to prune.

Georgia Tip

Here in Georgia, we prefer morning sun and afternoon shade for bigleaf hydrangeas.

Our summers can get hot enough that strong afternoon sun can really beat them up, especially when temperatures climb and rainfall becomes inconsistent.

Hydrangea Identification Chart: Panicle Hydrangea

Panicle hydrangeas (Hydrangea paniculata) are usually much easier to recognize once they begin flowering.

Instead of round mophead blooms, panicle hydrangeas produce elongated or cone-shaped flower clusters.

Popular examples include:

Limelight®

Little Lime®

Bobo®

Pinky Winky®

Quick Fire®

Quick Fire Fab®

Many panicle hydrangea flowers open white or light green and gradually develop shades of pink, red, or burgundy as they age.

Panicle hydrangeas also tend to be more tolerant of sunlight than bigleaf hydrangeas.

Another major identification clue is pruning.

Panicle hydrangeas bloom on brand new stems produced during the current growing season.

That means they can generally be pruned during late winter or early spring before new growth gets going.

The University of Georgia pruning guide confirms that panicle hydrangeas bloom on new wood, while bigleaf and oakleaf hydrangeas generally bloom on old wood.

If you have a cone-shaped hydrangea that blooms later in summer, there’s a good chance you’re looking at a panicle hydrangea.

You can also read our guide to panicle hydrangea bloom time if you’re trying to narrow down the type by when the flowers appear.

Smooth Hydrangea

Smooth hydrangea (Hydrangea arborescens) is native to the eastern United States and includes some very familiar garden hydrangeas.

Annabelle is probably the best-known example.

Other smooth hydrangeas include Incrediball® and the Invincibelle® series.

Smooth hydrangeas usually have broad green leaves with toothed edges and produce large white, greenish-white, or pink flower heads depending on the cultivar.

At first glance, a smooth hydrangea can sometimes be mistaken for a bigleaf hydrangea because both can have rounded flowers.

This is where our hydrangea identification chart becomes helpful.

Look beyond the flowers.

Smooth hydrangeas bloom on new wood.

Traditional bigleaf hydrangeas bloom on old wood.

Smooth hydrangeas are also generally very cold hardy and often send up a group of stems from the base of the plant.

UGA describes smooth hydrangeas as rounded shrubs with oval, serrated leaves and notes that their flowers develop on new spring growth.

So if you have a white round-flowered hydrangea that blooms reliably after being cut back in late winter, smooth hydrangea should be high on your list.

Hydrangea Identification Chart: Oakleaf Hydrangea

Oakleaf hydrangea (Hydrangea quercifolia) may be the easiest hydrangea on this entire list to identify.

Look at the leaves.

They’re large and deeply lobed, resembling the leaves of an oak tree.

That feature alone often gives it away.

Oakleaf hydrangeas also produce long white flower clusters that gradually fade into shades of pink and brown.

Older stems develop attractive peeling or exfoliating bark, giving the shrub winter interest even after the leaves are gone.

The foliage is another bonus.

In fall, oakleaf hydrangea leaves can develop deep shades of red, burgundy, and purple.

The University of Georgia’s native plant guide lists oakleaf hydrangea as native to Georgia and other parts of the Southeast and notes its distinctive flower clusters, fall color, and exfoliating bark.

Oakleaf hydrangeas bloom on old wood.

So don’t treat one like a panicle hydrangea and cut it hard during late winter.

If pruning is needed, it’s generally safer to do it after flowering.

Ruby Slippers and Gatsby Pink® are examples of oakleaf hydrangeas you may see in landscapes and garden centers.

For us here in Georgia, oakleaf hydrangea is one of those shrubs that really earns its keep because you get flowers, interesting foliage, fall color, and winter bark from the same plant.

Mountain Hydrangea

Mountain hydrangea (Hydrangea serrata) is where identification can get a little tricky.

It can look a lot like a bigleaf lacecap hydrangea.

That’s understandable because both can produce flat lacecap flowers with smaller flowers in the center and larger showy flowers around the outside.

The difference is usually easier to see when you compare the whole plant.

Mountain hydrangeas tend to be smaller and more compact than bigleaf hydrangeas.

Their leaves and flowers are also generally smaller.

The North Carolina Extension Plant Toolbox describes mountain hydrangea as more compact than bigleaf hydrangea, with smaller foliage and flowers and usually flattened lacecap flower heads.

Most mountain hydrangeas bloom on stems produced during the previous growing season, so pruning is normally done after flowering.

Some newer varieties may rebloom, so the exact cultivar still matters.

Bigleaf or Mountain?

If your hydrangea has lacecap flowers, use this part of the hydrangea identification chart:

Large leaves + larger shrub = probably bigleaf.

Smaller leaves + compact shrub = possibly mountain.

That won’t identify every cultivar by itself, but it gets you much closer.

Climbing Hydrangea

If your “hydrangea bush” is climbing a wall, tree, fence, or structure, the mystery may already be solved.

Climbing hydrangea (Hydrangea petiolaris, also listed botanically as Hydrangea anomala subsp. petiolaris) behaves completely differently from the shrub hydrangeas.

It is a woody vine.

The stems attach to surfaces with aerial rootlets and can climb surprisingly high once established.

Flowers are generally white and arranged in broad, flattened lacecap-style clusters.

According to the North Carolina Extension Plant Toolbox, climbing hydrangea uses aerial rootlets to attach to structures and can eventually become a very large woody vine.

Climbing hydrangeas can be slow to establish, so patience is part of growing one.

Once they get comfortable, though, they can cover a substantial area.

They usually need much less routine pruning than shrub hydrangeas.

For our hydrangea identification chart, the growth habit is the giveaway.

If it climbs, start here.

Can Flower Color Identify a Hydrangea?

Not reliably.

This is one of the biggest mistakes people make when trying to identify hydrangeas.

A blue hydrangea isn’t automatically one certain species.

A white hydrangea isn’t automatically a panicle hydrangea.

And a pink hydrangea could belong to several different groups.

Flower shape, leaves, growth habit, bloom timing, and stem age are much better identification tools.

Bigleaf and mountain hydrangeas are especially interesting because flower color in many varieties can change depending on soil chemistry and aluminum availability.

That means color can sometimes tell you something about the soil without telling you exactly what kind of hydrangea you have.

Does Bloom Time Help Identify Hydrangeas?

Yes, but use it as another clue rather than the only clue.

Oakleaf and many bigleaf hydrangeas tend to flower earlier in the season.

Smooth hydrangeas typically flower in summer.

Panicle hydrangeas are often the ones carrying the show later into summer and early fall.

Exact bloom timing still varies with cultivar, climate, spring temperatures, and where you live.

Here in our Zone 7b/8a part of Georgia, weather can move flowering earlier or later from one year to the next.

That’s why this hydrangea identification chart uses several traits instead of one.

Why Identifying Your Hydrangea Matters Before Pruning

This may be the most important reason to know what you have.

Imagine two hydrangeas sitting side by side.

One is a bigleaf hydrangea.

The other is a panicle hydrangea.

They may both look dormant during winter.

But they should not automatically be pruned the same way.

The bigleaf may already have flower buds sitting on stems from last year’s growing season.

The panicle will produce flowers on brand new stems in spring and summer.

Cut the wrong one at the wrong time and you may remove the flowers before you ever see them.

That’s why we always recommend identifying the plant first and reaching for the pruners second.

What Type of Hydrangea Do I Have?

If you’re still unsure, walk through this checklist.

Round mophead flowers + large broad leaves: Start with bigleaf hydrangea.

Round white or pink flowers + blooms on new stems: Check smooth hydrangea.

Long cone-shaped flowers + new wood bloomer: Check panicle hydrangea.

Cone flowers + deeply lobed oak-shaped leaves: Oakleaf hydrangea.

Small lacecap flowers + compact plant: Check mountain hydrangea.

Woody vine climbing a structure: Climbing hydrangea.

Then compare your plant with the full hydrangea identification chart above.

If you still can’t identify it, photographs of the flowers, leaves, entire plant, and stems are much more helpful than a close-up of a single bloom.

Don’t Forget the Variety

Identifying the species is the first step.

The variety matters too.

For example, knowing that you have a bigleaf hydrangea helps you understand its general care, but knowing whether it is a traditional old-wood bloomer or a reblooming variety can change how you approach pruning.

The same applies to size.

One panicle hydrangea might mature into a large shrub while another stays compact enough for a small bed or container.

Our complete Hydrangea Help guide can take you from identification into pruning, watering, fertilizing, bloom problems, and other hydrangea care questions.

Final Thoughts on Our Hydrangea Identification Chart

You don’t need to memorize every botanical detail to identify most hydrangeas.

Start with the obvious clues.

Look at the flowers.

Look at the leaves.

Look at the shape of the plant.

Notice when it blooms.

Then determine whether it flowers on old or new growth.

Our hydrangea identification chart gives you a starting point for narrowing down the six major types you’re most likely to encounter in the garden.

Once you know what type you have, everything else gets easier.

You’ll have a better idea of when to prune, how much sunlight it can handle, what size to expect, and why it may or may not be blooming.

If you enjoy growing hydrangeas, follow Bobby & Lynn’s Plant Farm on Facebook. We share what we’re seeing in our own plants here in Georgia, along with practical tips on pruning, watering, planting, and getting more blooms.