Hydrangea Flowers – When Do Hydrangeas Bloom


By: Amy Grant

When do hydrangeas bloom? This seems like a straightforwardenough question, and yet it isn’t. There is no one definitive hydrangeaflowering season. Why is it more difficult to discern hydrangea bloom time?When a hydrangea flowers depends on a few things.

When Do Hydrangeas Bloom?

Hydrangeasare woody flowering shrubs grown for their beautiful blossoms. As to whenhydrangeas bloom, the simple answer is that a usually a hydrangea flowers frommid-spring through the late summer or early fall.

The answer isn’t more definitive because the timing forhydrangea flowers depends on other factors besides just being a hydrangea. So,if you have a hydrangeathat’s not blooming this season, you may need to learn more about yourspecific variety and other factors that can influence its flowering.

About Hydrangea Flowering Season

One reason that there is no set date for hydrangea blossomsis that there are five main types of hydrangea found in North America. These includebigleaf (mopheadand lacecap),oakleaf,panicle,smoothand climbing.

Each type of hydrangea has a different bloom time. Forinstance, mophead hydrangeas bloom from late spring to midsummer in the southernmostregions. The exception to this is the new re-blooming hydrangeas which maybloom the entire growing season.

Hydrangea bloom time for panicle types is from late springto early summer, but the blooms stay on the plant until winter’s chill topplesthem.

Climbing hydrangeas bloom from late spring until mid-summer,and the lovely oakleaf varieties bloom from early summer in southern regionsand from mid-summer to early fall in the Midwest and northern states.

Another difficulty in knowing exactly when hydrangeaflowers; in different sections of the country, the same type of hydrangea willbloom at different times. Hydrangeas planted warmer climates will bloom earlierand longer than those in northern climates.

Hydrangea flowering season is also affectedby pruning or the lack thereof. Pruning some varieties of hydrangea in thespring can delay their blooms. Hard pruning of smooth hydrangea in the latewinter to early spring will reduce the number of flowers but increase their sizeand delay hydrangea bloom time.

Lastly, hydrangea flowering season isn’t only dictated bythe cultivar and/or pruning. Hydrangea bloom time is also influenced by sunexposure, over or under watering, and over fertilizing the plant.

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Read more about Hydrangeas


How to Grow Bobo Hydrangea

Bobo hydrangea is the trade name for a dwarf variety of the panicle hydrangea (Hydrangea paniculata 'Ilvobo'). While similar to other hydrangeas in every other way, including care needs, it grows only 2 to 3 feet high and slightly wider, making it an excellent foundation shrub or short hedge. It can also be used in mixed shrub borders in situations where larger hydrangeas might be overwhelming.

Bobo blooms all summer with flowers that form large panicles with a pyramidal shape—an identifying feature of all paniculata hydrangeas. The flowers are initially white but gradually turn pink, then deepen into purplish as fall approaches. The oval leaves have serrated edges, typical of other panicle hydrangeas. Bobo is not one of those hydrangeas whose floral color is dependent on soil pH . If you want to be able to manipulate the color of your hydrangeas, grow a variety of H. macrophylla, not H. paniculata.

Panicle hydrangeas are generally fast-growing shrubs, putting on as much as 25 inches per year. As a dwarf plant, Bobo is a bit slower-growing, but depending on the size of the nursery plant purchased, it likely will reach its full stature within two years. Standard planting time is spring, after the soil temperatures have warmed.

Botanical Name Hydrangea paniculata 'Ilvobo' Bobo
Common Name Bobo hydrangea
Plant Type Deciduous shrub
Mature Size 2–3 feet tall, 3–4 feet wide
Sun Exposure Full sun to part shade
Soil Type Rich, well-drained soil
Soil pH 5.8–6.2 (acidic)
Bloom Time Early to late summer
Flower Color White, gradually turning red-purple
Hardiness Zones 3–9 (USDA)
Native Area China, Japan
Toxicity Slightly toxic, but rarely dangerous

More is More: Hydrangeas that Bloom All Summer

Once upon a time, hydrangeas would only bloom once a season. Not anymore! Now, you can choose a variety of hydrangeas that bloom all summer long. You can even prune these at any time.

Reblooming hydrangeas flower on both new and old growth, meaning you can enjoy flowers from June until the first frost. They’ll continue to bloom long after other flowering shrubs and perennials have stopped. Long lasting blooms of blue, violet, pink, white, or chartreuse add brilliant pops of color to any garden.

Plus, these hydrangeas perform a magic trick. Depending on your soil’s acidity, the hydrangea color changes. Creating breathtaking blue hydrangeas is extremely easy. All you need to do is amend your soil with Espoma’s Organic Soil Acidifier.

Photo courtesy of Bailey Nurseries

The Original Endless Summer Hydrangea – A beautiful game changer! The Original Endless Summer hydrangea was the first non-stop blooming hydrangea. Plus, it’s easy to care for. You’ll be wowed by its color-changing blooms all season.

Hydrangea Type: Mophead

Shrub Type: Deciduous

Light: Part sun-mostly shade

Size: 3-5’ H x 3-5’ W

Blooms: Late-spring-early fall. Blooms can be blue, purple or pink based on soil pH.

    • Blooms all season
    • Very disease tolerant
    • Easy care
    • Works in container gardens

Soil: Moist, well-drained soil. 5.5 or lower soil pH for blue blooms. 5.5-6.5 soil pH for purple blooms. 6.5 soil pH or higher for pink blooms.

Photo courtesy of Doreen Wynja for Monrovia

Penny Mac Hydrangea – Large flowers that just keep blooming! The Penny Mac hydrangea is super easy to care for and seems to thrive on neglect. While the blooms can change color, they’re naturally a vivid blue.

Hydrangea Type: Mophead

Shrub Type: Deciduous

Light: Part sun

Size: 4-6’ H x 3-4’ W

Blooms: Mid-summer-early fall. Blooms are typically blue, but can be changed to pink or purple based on soil pH.

  • Attracts birds
  • Repeat bloomer
  • Fast growing
  • Easy care

Soil: Moist, well-drained soil. 5.5 or lower soil pH for blue blooms. 5.5-6.5 soil pH for purple blooms. 6.5 soil pH or higher for pink blooms.

Let’s Dance Starlight Hydrangea – You’ll feel like dancing when you see this breath-taking bloom. It’s elegant, bright and beautiful textured. Plus, it’s the first-ever, re-blooming lacecap hydrangea.

Hydrangea Type: Bigleaf

Shrub Type: Deciduous

Light: Full-part sun

Size: 2-3’ H x 2-3’ W

Blooms: Mid-summer-early fall. Vivid, lacecap blooms can be blue, purple or pink based on soil pH.

  • Small hydrangea
  • Repeat bloomer
  • Works in container gardens
  • Salt tolerant

Soil: Prefers moist, well-drained soil. 5.5 or lower soil pH for blue blooms. 5.5-6.5 soil pH for purple blooms. 6.5 soil pH or higher for pink blooms.

Keep the blooms coming all season long with the hydrangea that speaks to you! Want one that grows in full sun? Learn about the best hydrangeas for beginners. Find out even more about hydrangea care in our Ultimate Hydrangea Guide!


Watch the video: To Prune or Not to Prune? My Secrets to Make Hydrangeas Bushy


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