Bigleaf Hydrangea Care Guide
By Richard "Woodie" Buller, GGD co-founder with 35+ years in horticulture
Published On: Oct 29, 2026
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Hydrangea macrophylla — mophead and lacecap hydrangeas
Bigleaf hydrangeas bring a lot of personality to the garden, from those big, rounded mophead flowers to the delicate shape of lacecap blooms. Keeping them happy comes down to understanding their moisture needs and protecting the stems that carry their flower buds. Once you get those two things right, their care becomes much easier.
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Give Your Hydrangea the Right Balance of Sun and Shade
Morning sun and afternoon shade is a good starting point for bigleaf hydrangeas. It provides light for flowering while protecting their broad leaves from the hottest part of the day. Moist, well-drained soil helps them handle summer conditions without keeping their roots waterlogged.
Watch how the location changes over time. A nearby tree may gradually cast more shade on your hydrangea or compete for water. If a previously dependable plant starts producing fewer flowers, look at those changing conditions before reaching for fertilizer.
Mophead and lacecap bigleaf hydrangeas share these basic growing needs. Flower shape does not determine pruning timing; the important distinction is whether your variety reblooms.
How Much Water Does a Bigleaf Hydrangea Need?
Use about 1 inch of water per week, including rainfall, as a starting point during active growth. Soil moisture should make the final decision. Hot weather, sandy soil, and competing tree roots can increase demand, while slow-draining soil may stay wet much longer.
Check moisture beneath the mulch at a depth of approximately 6 inches. If the soil is dry there, water slowly over the root area so moisture reaches that depth. If it is still damp, hold off. A soaker hose or drip irrigation makes it easier to water the soil without soaking the foliage.
During the first two growing seasons, check at least weekly, with closer attention during hot, dry weather. Even an established hydrangea needs help during prolonged drought.
Why Does My Hydrangea Wilt Every Afternoon?
Bigleaf hydrangeas can look quite dramatic on a hot afternoon. Their leaves sometimes lose water faster than the roots can replace it, even when the soil contains enough moisture. This is especially important to note for the first year or so while the plant establishes a good root system.
Check the soil before adding more water. If it is damp and the leaves recover as temperatures cool, temporary heat wilt is the likely explanation. If the soil is dry, water deeply. Repeatedly watering an already wet root zone can create another problem.
Maintain Mulch Without Burying the Stems
Keep 2 to 3 inches of bark mulch or shredded leaves over the root area, with the mulch pulled away from the stems. This helps conserve moisture, moderate soil temperature, and reduce weed competition.
Check the existing depth before adding another layer. Replace what has decomposed instead of building a deeper pile every year.
Fertilize According to Your Soil and Your Plant
A healthy hydrangea growing in reasonably fertile soil may need little additional fertilizer. Start with a soil test, especially if growth is weak or foliage looks unhealthy. More fertilizer will not replace missing flower buds or correct poor drainage.
Where feeding is warranted, use a slow-release, all-purpose shrub fertilizer when new growth begins, following its labeled rate and your soil-test recommendations. 10-10-10 is one general-purpose N-P-K formulation identified in extension guidance.
Spread fertilizer over the root area and water it in. Avoid repeatedly feeding a lush, leafy plant simply because it has few flowers. Excess nitrogen can encourage foliage at the expense of blooms.
Bigleaf Hydrangea Varieties and When to Prune
Bigleaf hydrangeas rarely need much pruning. If your plant fits its space and looks healthy, leave those stems alone. When shaping is necessary, keep it light.
Traditional varieties form flower buds on stems grown during the previous season, called old wood. Reblooming varieties can also flower on new growth, but preserving healthy overwintered stems helps protect their earliest flowers.
Use the following flowering triggers instead of calendar dates:
- Blue Jangles® Reblooming Hydrangea: Lightly shape after the first main flush of flowers fades.
- Cardinal Red Hydrangea: Shape immediately after its main flowers fade.
- Cherry Explosion™ Hydrangea: Lightly shape after the first main flush of flowers fades.
- Endless Summer® BloomStruck® Hydrangea: Lightly shape after the first main flush of flowers fades.
- Endless Summer® Blushing Bride® Hydrangea: Lightly shape after the first main flush of flowers fades.
- Endless Summer® Reblooming Hydrangea: Lightly shape after the first main flush of flowers fades.
- Endless Summer® Summer Crush® Hydrangea: Lightly shape after the first main flush of flowers fades.
- First Editions® Eclipse™ Hydrangea: Shape immediately after its main flowers fade.
- L.A. Dreamin'® Hydrangea: Lightly shape after the first main flush of flowers fades.
- Magical® Ruby Red Hydrangea: Shape immediately after its main flowers fade.
- Nikko Blue Hydrangea: Shape immediately after its main flowers fade.
- Onyx Zebra Hydrangea: Shape immediately after its main flowers fade.
- Pistachio Hydrangea: Lightly shape after the first main flush of flowers fades.
- Pop Star® Reblooming Hydrangea: Lightly shape after the first main flush of flowers fades.
- Rhythmic Blue® Reblooming Hydrangea: Lightly shape after the first main flush of flowers fades.
- Twist-n-Shout® Reblooming Hydrangea: Lightly shape after the first main flush of flowers fades.
- Wedding Gown™ Hydrangea: Lightly shape after the first main flush of flowers fades.
- Wee Bit Giddy® Hydrangea: Lightly shape after the first main flush of flowers fades.
- Wee Bit Grumpy® Hydrangea: Shape immediately after its main flowers fade.
For every variety, wait until buds open and leaves emerge before removing winter-damaged growth. Cut dead portions back to healthy growth.
Rebloomers can also be pruned as growth begins in spring, but removing healthy stems can delay their earliest flowers.
Should You Remove Faded Flowers?
Deadheading is optional. If you prefer a tidier appearance, clip off the faded flower head at the branch tip without shortening the stem further. You can also leave dried flowers standing for winter interest.
Protect Next Season's Flowers Through Winter
A hydrangea can survive winter and still lose its flower buds. That is why a healthy-looking shrub may leaf out beautifully but produce very few flowers.
Continue checking soil moisture during dry weather before the ground freezes, and leave healthy stems standing. In colder locations, an enclosure around the shrub filled with insulating material can help protect overwintering buds.
Once buds begin opening, watch for returning frost. Cover vulnerable growth with frost cloth or a sheet when freezing temperatures are forecast, then remove the temporary cover as conditions warm.
Cold-Weather Timing by Zone Band
Apply these directions only where your specific cultivar is rated hardy.
| Zone band | Timing and care priority |
|---|---|
| Cold: zones 4–5, eligible cultivars only | Arrange winter protection after dormancy and before severe cold. Protect emerging growth when freezing weather returns. |
| Moderate: zones 6–7 | Watch for freezes following warm spells, particularly once buds begin opening. |
| Warm: zones 8–9 | Use temporary frost protection when freezing temperatures threaten actively growing buds or leaves. |
Caring for Bigleaf Hydrangeas in Containers
Container roots receive less insulation than roots in the ground. A variety's landscape hardiness rating does not automatically mean it can spend winter exposed in a pot.
Where severe cold threatens, protect the container after the plant becomes dormant and before the soil freezes. Options include sinking the pot into the ground or moving it to a sheltered, unheated space.
A general overwintering range for container-grown woody plants is 20 to 45°F. Monitor moisture during storage. Water when needed while the potting mix is unfrozen, and avoid saturation. In above-freezing storage, watering may be needed every 2 to 3 weeks, depending on conditions.
Why Did My Blue Hydrangea Turn Pink?
Flower color depends on the cultivar and the availability of aluminum in the soil. Acidic conditions generally make aluminum more available, encouraging blue or purple flowers in responsive varieties. When aluminum is less available, flowers tend toward pink.
Start with a soil test before applying sulfur, lime, or aluminum sulfate. Amendment amounts depend on the existing soil and the product being used. Repeated applications without testing can move conditions farther than intended.
White-flowered varieties generally stay white, although their flowers may develop blush tones as they age.
Shop the Bigleaf Hydrangea Collection
Common Bigleaf Hydrangea Questions
Why Is My Hydrangea Healthy but Not Blooming?
Check pruning history, winter and spring freeze damage, deer browsing, and available sunlight. Too much nitrogen is another possibility. A green shrub can still have lost its flower buds.
Reblooming varieties may flower later on new growth after overwintered buds are damaged, but recovery is not guaranteed.
Should I Cut Back My Hydrangea in the Fall?
Avoid routine fall shortening of healthy bigleaf stems. Those stems may already carry next season's flower buds. Leave them standing, even if you remove faded flower heads.
Why Are the Leaves Turning Yellow or Brown?
Start with moisture and recent weather. Prolonged drought can cause yellowing, scorched edges, and early leaf drop. Excessively wet soil can also harm roots. Frost may leave newly opened leaves looking blackened or burned.
Check the root area before changing the watering routine or adding fertilizer. Damaged leaves alone do not establish a diagnosis.
What Should I Do About Purple or Brown Leaf Spots?
Common hydrangea leaf spots are often cosmetic. Direct irrigation onto the soil, allow air to move around the shrub, and remove badly affected leaves where practical. Seek a diagnosis if symptoms spread rapidly or the whole plant declines.
Are Bigleaf Hydrangeas Deer Resistant?
They are susceptible to browsing. Deer can remove foliage and flower buds, so protection matters where deer visit frequently.
Do Mopheads and Lacecaps Need Different Care?
Within Hydrangea macrophylla, their basic care is similar. Flower shape does not tell you whether a plant reblooms; check the cultivar.
Care in Year Two and Beyond
Continue monitoring moisture through the second growing season while roots establish. Preserve healthy stems, maintain mulch, and address changes in light or drainage.
From year three onward, the same maintenance routine continues: moisture checks, watering when needed, restrained feeding based on soil conditions, and pruning appropriate to the plant's flowering habit. There is no separate year-four or year-five care program.