Bigleaf Hydrangea Care Guide for Your Home Garden

Bigleaf hydrangeas are a stunning addition to any home garden, providing a burst of vibrant blue or pink flowers in the summer months. They thrive in partial shade and well-drained soil.

To ensure your bigleaf hydrangea gets the right amount of sunlight, plant it in a spot that receives morning sun and dappled afternoon shade. This will help prevent scorching of the leaves.

Bigleaf hydrangeas can grow quite large, up to 6 feet tall and 8 feet wide, so be sure to give them enough space to spread out.

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Bigleaf hydrangeas thrive in moist, humusy, well-drained soil that's perfect for their roots to grow.

In areas with very hot summers, a little afternoon shade can prevent the foliage from scorching. This is especially important in USDA zones 7 and warmer.

These plants are hardy to zone 5, but they still require a well-drained soil and plenty of water to stay healthy.

Planting them in containers is also a great option, as it gives you more control over the soil and sunlight they receive.

Bigleaf hydrangeas grow best with morning sun and afternoon shade, which helps prevent scorching and promotes healthy growth.

To maximize their flower production, apply a couple of doses of a balanced fertilizer, such as 10-10-10, one in spring and again after flowering.

In cold climates, plant them where they're protected from frigid Westerly winds and weather, like on the east side of your home or surrounded by walls or other structures. This will help prevent damage to the flower buds.

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Planting bigleaf hydrangeas is a straightforward process. Dig a hole about twice the width of the nursery container and just deep enough to fit the root ball so the plant sits at the same level or a bit higher than in the container.

Backfill with soil and tamp down the soil to ensure good contact between the soil and the roots. Water deeply to get rid of any air pockets.

To ensure consistent moisture, provide your bigleaf hydrangeas with an inch or two of water each week, along with a 2- to 3-inch layer of organic mulch. This will keep the plants healthy and prevent drooping leaves.

Here are some general care requirements to keep in mind:

Plant bigleaf hydrangeas in the summer or fall when the weather is cooler. This will give them a better chance to establish themselves before the heat of summer.

Dig a hole about twice the width of the nursery container and just deep enough to fit the root ball. This will ensure the plant sits at the same level or a bit higher than in the container.

Water deeply to get rid of any air pockets in the soil. This is especially important when planting multiple hydrangeas, which should be spaced about five feet apart.

If you're planning to add bigleaf hydrangeas to your garden, keep in mind they prefer a location with dappled or partial sun. This will help them thrive and produce beautiful flowers.

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To care for your bigleaf hydrangeas, remember to water whenever the top layer of soil feels dry. This will keep them happy and healthy.

Here are the main care requirements for growing a bigleaf hydrangea at a glance:

To keep your bigleaf hydrangea happy and healthy, provide it with consistent moisture. Water the shrub slowly and deeply when the top few inches of soil feel dry.

One inch to two inches of water per week is a good target, but the soil should also have a 2- to 3-inch layer of organic mulch to help retain moisture. This will keep the roots hydrated and the plant thriving.

If the soil feels moist, leave the plant alone and don't worry if the leaves flag a bit in the heat of the day – they'll recover quickly once things cool down.

Planting bigleaf hydrangeas in a northern or eastern exposure helps them avoid being nipped by a late frost.

If you garden where temperatures fluctuate wildly in spring, the emerging flower buds may be killed by cold snaps.

Try growing cold-hardy cultivars like 'Nikko Blue' or 'Blue Billow' for better results.

Newer cultivars that bloom on both old and new wood, such as Endless Summer, are also good choices.

Even if the flower buds are winter-killed on these plants, more buds will form on the new growth and you'll still enjoy the midsummer flowers.

Bigleaf hydrangeas prefer moist, well-drained soil that can withstand their tendency to wilt easily. Mulch is also a must-have, with a 2-3" layer recommended for all climates and all year-round.

Moisture and mulch are just the beginning - bigleaf hydrangeas can grow well in acidic to slightly alkaline soils, with a pH range of 7.5+. This means you don't need to worry about creating acidic soil specifically for them.

Fertilizing your bigleaf hydrangea is also crucial, especially if you live in an area with extreme pH levels. A granular rose fertilizer applied in early spring will help prevent yellow or pale leaves, and monthly fertilizing from early spring through late July will encourage consistent growth and new wood flowers later in the season.

Bigleaf hydrangeas prefer moist, well-drained soil to thrive. This type of soil helps prevent wilting, keeping your plant looking its best.

A 2-3" layer of mulch is crucial in all climates, year-round, to maintain soil moisture and health.

Moist, well-drained soil is the key to bigleaf hydrangea success, not acidic soil as many think. They can actually grow well in acidic to slightly alkaline soils with a pH of 7.5+.

The pH of the soil impacts the flower color of most varieties, but it's not the only factor at play.

Using a slow-release, balanced fertilizer is recommended for bigleaf hydrangea in the spring just as new growth starts.

Fertilizing monthly from early spring through late July is a good idea for reblooming bigleaf hydrangeas to encourage consistent, vigorous growth.

For areas with extreme pH, either acidic or alkaline, a granular rose fertilizer in early spring can help mitigate yellow or pale leaves.

Fertilizer will not only address pH issues but also promote the formation of new wood flowers later in the season.

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Pruning bigleaf hydrangeas can be a bit tricky, but it's essential to get it right to ensure you enjoy those beautiful blooms. Prune dead or diseased stems as needed, and avoid pruning bigleaf hydrangeas entirely, as it can negatively impact flowering.

To prune correctly, you need to know if your bigleaf hydrangea blooms on old wood or new wood. Most bigleaf hydrangeas bloom on old wood, but some varieties, like Penny Mac hydrangeas, bloom on both old and new wood. Prune immediately after flowering.

In cold climates, prune dead stems just above where new growth can be seen. If your plant has lots of dead wood year after year, it may indicate the spot isn't suitable for a bigleaf hydrangea, and you should consider moving it.

Bigleaf hydrangeas don't need much pruning, but a little light trimming in early spring can help. Cut back old flower heads to the closest leaf nodes, and remove any dead or diseased stems. Prune weak shoots, both old and new, cutting them at the base.

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To ensure you don't miss out on blooms, prune only in the summer after plants finish blooming and strong new shoots have developed from the base of the plant. Remove weak shoots, leaving several stems of old productive wood as well as strong new stems that will flower next season.

Here's a quick rundown of the pruning rules:

By following these simple pruning and maintenance tips, you'll be able to enjoy your bigleaf hydrangea's beautiful blooms for years to come.

Bigleaf hydrangea flowers can famously vary in color from blue to pink, depending on the soil, but it's not just about acidity - aluminum, a mineral found in many soils, also plays a role.

Blue flowers require acidic soil with aluminum present, but even acidic soil without aluminum won't produce blue flowers.

The color of nearby hydrangeas can indicate what color your own will bloom with, as long as soil conditions are similar.

It's worth noting that commercial growing media often lacks aluminum, so bigleaf hydrangeas bought online or in a garden center will likely bloom pink unless specifically treated to bloom blue.

Bigleaf hydrangea flowers are famous for their ability to change color from blue to pink depending on the soil conditions. Many people think that blue flowers develop in acidic soils and pink in neutral to alkaline soils, but that's not the whole story.

The presence of aluminum, a mineral found in many soils, is also crucial for blue color to develop. If your soil lacks aluminum, you might still have acidic soil but not get blue flowers.

The color of your hydrangea flowers can be influenced by the conditions of the soil in your neighborhood or town. If you see blue flowers in your area, it's likely that your hydrangea will bloom blue too.

Most commercial bigleaf hydrangeas will bloom pink unless they were specifically treated to bloom blue. This is because the growing media used in commercial nurseries doesn't contain aluminum.

If you want your hydrangea to be blue, you need to make sure the aluminum in your soil is available to the plant. In acid to neutral soils, this isn't a problem, but in alkaline soils, the roots can't take up the aluminum and the flowers will be pink.

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Getting your bigleaf hydrangea to bloom can be a challenge, but it's often due to simple mistakes like pruning at the wrong time of year, which can accidentally remove the flower buds.

Too much shade is another common issue, so make sure your hydrangea is in a spot that gets plenty of sunlight.

A late spring frost after a warm spell can also kill the flower buds, so keep an eye out for any unexpected cold snaps.

Additional fertilizer won't encourage more blooming, so focus on providing the right growing conditions instead.

Aside from pruning promptly after the bloom is over, there is no other care necessary after blooming.

Bigleaf hydrangeas are generally easy to care for, but they can be susceptible to a few pests and problems. One of the most common issues is powdery mildew, a fungal disease that can be managed by selecting a resistant variety like Bloomstruck.

Other pests that can be attracted to hydrangeas include aphids, black vine weevils, four-lined plant bugs, Japanese beetles, and spider mites. These can be managed with insecticidal soap.

If the leaves of your bigleaf hydrangea turn yellow, it could be due to overwatering, underwatering, or too much fertilizer. Drooping leaves in hot weather and browning leaves can also be a sign of excess fertilizer or a fungal or bacterial disease.

To keep your bigleaf hydrangea healthy, make sure it gets the right amount of sun and shade. It prefers morning sun and afternoon shade, and should be pruned minimally to remove broken or dead stems.

Here are some common problems to watch out for:

Bigleaf hydrangeas are relatively pest- and disease-free, but some issues can arise.

Powdery mildew, bacterial wilt, blight, and leaf spot are fungal and bacterial diseases that can affect bigleaf hydrangeas. Selecting a resistant variety, such as Bloomstruck, can help manage powdery mildew.

Several pests, including aphids, black vine weevils, four-lined plant bugs, Japanese beetles, and spider mites, are attracted to hydrangeas. Many of these pests can be managed with insecticidal soap.

Overwatering, underwatering, or too much fertilizer can cause the leaves of your bigleaf hydrangea to turn yellow. Drooping leaves in hot weather can also be a problem, as can browning leaves due to excess fertilizer or disease.

Bigleaf hydrangeas need both sun and shade to grow. Ideally, they should receive sun in the morning and shade in the hot afternoon hours.

Deer can be a problem for gardeners, especially when it comes to bigleaf hydrangeas. They tend to like the taste of these plants, so regular use of a spray repellent is a good idea, especially during the growing season.

In areas where deer are a problem, using a spray repellent can help keep them from making your garden their buffet line.

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Bigleaf hydrangea is easy to propagate by rooting stem cuttings or layering.

Both methods are best done in the spring or early summer, giving the cutting time to root before being planted in the fall.

Propagating plants is a great way to share your favorites with friends or expand your own garden. Propagating Bigleaf Hydrangea is a breeze, and it can be done in two easy ways: rooting stem cuttings or layering.

Rooting stem cuttings is a popular method, and it's best done in the spring or early summer so the cutting has time to root and can be planted in the fall. This gives the new plant a head start on the growing season.

Layering is another great option, and it's also best done in the spring or early summer. This method involves bending a stem down to the ground and securing it in place, allowing roots to form before cutting it from the parent plant.

Potting and Repotting is an essential part of caring for your Bigleaf Hydrangea. Select a dwarf variety like 'Wee Bit Grumpy' which grows 24 inches tall and 30 inches wide at maturity.

Bigleaf hydrangeas need containers with large drainage holes to prevent waterlogged soil. A well-draining potting mix is also crucial for the health of your plant.

Repot your Bigleaf Hydrangea when the roots emerge from the drain holes or the plant becomes root-bound. This will give the roots more room to grow and prevent the plant from becoming pot-bound.