How to Care for Hydrangeas—From Planting to Arranging Beautiful Bouquets

Hydrangeas are a common sight, but these lovely flowers require some attention to transform into the stunning blooms we adore. Whether they’re showcased in a vase, growing in your garden, or thriving in a pot, their vibrant, full blooms never go out of style.

Like all flowers, hydrangeas require consistent care. They thrive with some tender loving care, so grab your gardening tools, roll up your sleeves, and get ready to nurture your plants—your hydrangeas will reward you for it.

Different Varieties of Hydrangeas

When you think of hydrangeas, the striking blue-purple flowers probably come to mind first, but there’s a wide range of beautiful hydrangea varieties to explore. Below are some of the most popular options.

Smooth Hydrangeas (Hydrangea Arborescens)

These blooms resemble large white snowballs, which is why they’re often called snowball hydrangeas. Naturally fast-growing, they require minimal or no fertilizer to thrive.

Panicle Hydrangeas (Hydrangea Paniculata)

Panicle hydrangeas are among the most prevalent hydrangea types, and they can be found in both shrub and tree forms. 'Panicle hydrangeas boast cone-shaped flowers that first bloom in early summer and gradually shift to hues of parchment, pink, and red as the weather cools in the fall,' explains McEnaney. Popular varieties include Berry White and Vanilla Strawberry.

Oakleaf Hydrangeas (Hydrangea Quercifolia)

This variety of hydrangea is known for its lobed leaves, resembling those of the mighty oak tree. Native to the southeastern United States, oakleaf hydrangeas bloom green before transitioning to shades of white, pink, and brown. Their reddish-brown bark naturally peels away over time.

Bigleaf Hydrangeas (Hydrangea Macrophylla)

These hydrangeas are likely the first ones that come to mind. They feature blooms in shades of purple and blue, but also in white, pink, and red. Known for their large flower clusters, which are sometimes referred to as mop heads, they are made up of large, striking leaves.

How to Care for Hydrangeas

Hydrangeas produce large, beautiful blooms that add a festive touch to gardens. Their care is simple, requiring just the right combination of soil, temperature, water, and sunlight.

Temperature and Season

"The optimal time to plant hydrangeas is during mild spring or fall weather," explains Ryan McEnaney, a spokesperson for Endless Summer Hydrangeas. "In spring, wait for the last frost to pass and the ground to thaw enough for easy digging. In the fall, don't delay too long, as a frost could harm the plant. While summer planting is possible, avoid extremely hot or bright days. These flowers bloom at their best from mid-summer to fall."

During winter, hydrangeas require extra protection. Ryan McEnaney advises, "Add a thick layer of mulch, leaves, or pine straw up to 6 to 8 inches deep to shield delicate buds from harsh temperature fluctuations, cold nights, and strong winter winds. For younger plants, using a protective cage is also beneficial—and it helps keep rabbits away."

Soil

Hydrangeas thrive in moist, well-draining soil, but not overly wet conditions. If you have clay or sandy soil, don't worry—you can still grow them. "For clay soil that holds too much water, add gypsum or organic matter to promote better growth," McEnaney recommends. "For sandy soil, composted material helps retain the necessary moisture and nutrients for your hydrangea's health."

Fertilizer

If you live in an area with moist, well-drained soil, your hydrangeas may not require much additional care. Ryan McEnaney suggests, "To boost blooms, a 10-10-10 fertilizer will give your hydrangeas the extra energy needed for more flowers."

For optimal fertilizer results, McEnaney recommends applying it according to the package instructions as soon as new leafy growth begins to appear in the spring. "Be sure to distribute the fertilizer under the entire drip line of the plant, which covers the entire span of its branches," he advises. Since hydrangeas have shallow roots, this ensures the fertilizer reaches the entire root system.

Light

Hydrangeas thrive in areas with partial shade. McEnaney suggests, "Ensure there is ample space for the hydrangea to grow, the soil is properly prepared, and the plant receives the right amount of sunlight." He recommends planting hydrangeas where they get five to six hours of morning sun, followed by dappled shade. For warmer climates, place them where they can enjoy two to three hours of morning sunlight and some afternoon partial shade.

How to Cultivate Hydrangeas

Begin by digging! "Create a hole slightly larger than the pot your hydrangea came in, while considering that the plant will need ample space to grow to its full size," McEnaney advises. "Add a small amount of high-phosphorus fertilizer to the bottom of the hole, then gently loosen the roots of the plant with your fingers before removing it from its container."

Place the plant in the hole, ensuring the crown (where the base of the stem meets the soil) is level with the surrounding ground." After planting, cover with soil and water it. Hydrangeas thrive in loamy soil, which is a mixture of sand, silt, and a touch of clay, so check the soil regularly in the first couple of seasons to make sure it doesn't dry out or become waterlogged.

It's perfectly fine to take a shortcut and purchase a shrub from your local nursery, rather than trying to grow your hydrangeas from seeds—especially since hydrangea seeds can be rare to find. "If you do manage to get your hands on seeds, sow or scatter them in the soil, and be extra careful during the germination process," McEnaney explains. "Growing a shrub to the same size as those from a garden center may take two to three years."

Growing in Containers

Taking care of potted plants requires a different approach than caring for a garden bed. "Ensure the bottom of your pot has drainage holes to allow excess water to escape," advises McEnaney. "Without drainage, too much water could accumulate around the roots, which might prevent blooming and cause the leaves to droop." When choosing a pot, the size depends on how many hydrangeas you plan to plant and if you wish to add other types of flowers. Larger pots hold more soil and water, so you won’t need to water them as often.

Opt for pre-mixed, bagged potting soil. "Fill the decorative pot with the soil, leaving about eight inches of space at the top," McEnaney suggests. "Center the hydrangea in the pot and fill around it with soil." Leave 1 inch of space between the top of the soil and the rim of the pot to prevent overflow when watering. For bigger containers, you can add other flowers for an attractive, colorful arrangement.

Just like hydrangeas planted in the ground, those in containers require plenty of water. To check if your plants need watering, use the same method of inserting your fingers into the soil to feel for dryness. McEnaney mentions that container hydrangeas might need extra water since they aren't planted in the ground and have less soil to absorb moisture from.

Common Problems

Many of the newer hydrangea varieties are developed to resist pests and diseases (which is great!). However, there are still a few potential issues to be mindful of, particularly if you live in a hot or humid region.

Leaf Spot

One common issue is cercospora leaf spot. "This fungal disease is caused by moisture on the leaves and can result in unsightly damage," McEnaney explains. Oak leaf and panicle hydrangeas are especially vulnerable to this bacterial infection.

Leaf spot appears as dark, wet-looking brown patches on both sides of the leaf. To prevent this issue, avoid over-wetting the hydrangeas and prune them as needed. Proper airflow will help prevent the problem, but if it occurs, applying a fungicide can help resolve it.

Powdery Mildew

Another problem to watch out for is powdery mildew, which is particularly common in bigleaf hydrangeas. This white, powdery coating blocks sunlight and may cause the leaves to yellow, brown, and eventually wither. The primary causes of powdery mildew are shade and overcrowded conditions.

To prevent powdery mildew, reduce moisture levels and improve air circulation, just like with leaf spot. McEnaney also suggests removing affected leaves to prevent the disease from spreading.

Spider Mites

Spider mites can be a real problem for hydrangeas. These tiny pests spin webs around the flowers and feed on the plant’s nutrients. You can identify spider mites by the tiny holes they leave on the leaves, which look like freckles. While natural predators usually keep them in check, an insecticide can be effective if you're dealing with an infestation.

Aphids

Aphids are another threat, feeding on the leaves and causing them to yellow and wither. They’re not always easy to spot, but if you flip the leaves over, you’ll see clusters of black or green aphids feeding on the underside. To get rid of aphids, spray the hydrangeas with a strong stream of water from a hose or wash the leaves with insecticidal soap.

Beetles

Japanese beetles and rose chafer beetles are the most common beetles that damage hydrangeas. Japanese beetles are metallic green and feed on the leaf tissue, leaving only the veins behind. Rose chafer beetles are tan, about 1/3 inch long, and they not only skeletonize the leaves like Japanese beetles but also feed on the flowers.

To eliminate these insects, manually remove them and soak the leaves in soapy water to kill any eggs. You can prevent these beetles from attacking by spraying the plants with Neem oil or applying a preventative insecticide.

How to Maintain a Hydrangea Bouquet

When selecting hydrangeas at the store, look for vibrant, healthy green leaves and lively blooms. "Check for any brown spots on the petals, as this could indicate sun damage," suggests Callie Bladow, former production director at BloomThat.

When handling hydrangea flowers, be cautious about darkened petals, as they may be a sign that the blooms have touched the refrigerator walls due to improper cold storage. You want a hydrangea that feels firm, not squishy or soft. A good quality bouquet, if selected carefully, can stay fresh for up to two weeks. Follow these simple steps to keep your hydrangea flowers looking vibrant.

Harvesting Garden Blooms

If you're fortunate enough to have hydrangeas in your garden, it's easy to bring them inside for a lovely arrangement. Use a sharp floral knife or clean kitchen scissors to cut the stems at a 45-degree angle, then place them in a bowl of lukewarm water while you continue working outdoors.

Bladow suggests, "The ideal time to cut hydrangea blooms is early in the morning. Select the fullest, most mature blooms, and leave the younger ones to continue developing. Hydrangeas that are fully bloomed will appear more 'papery' compared to the still-developing buds."

Use Alum Powder for Preparation

Hydrangeas release sap from the base of their stems, which needs to be sealed to allow the flowers to absorb water. "Once you cut the stem at an angle, dip it into alum powder, which is a type of onion powder available at most grocery stores in the spice section," says Bladow.

"A quick dip of the stem's bottom, followed by placing it straight into the vase, does the trick." If you don’t have alum powder, boiling water for about 10 seconds will work just as well. Don’t forget to remove the leaves from the stem, as they tend to absorb the water intended for the blooms," Bladow advises.

Designing with Other Flowers

You can choose a traditional all-hydrangea arrangement, or experiment by combining hydrangeas with other flowers or selecting unique vases. Bladow shares, "I enjoy using glass apothecary jars with wider bases and narrow necks for a distinctive look."

"Another technique we love for arranging hydrangeas is to use them as a framework for other flowers. The multiple stems on a hydrangea head help hold other flowers in place, so you can simply insert them into the hydrangea bloom." Hydrangeas can be paired with various flowers—Bladow recommends roses, dahlias, and freesia, along with greenery like lemon leaf or variegated pittosporum.

Change Water Regularly

Bladow suggests, "Hydrangeas prefer cool water, which should be refreshed every two days along with a fresh trim of the stems. You can also add some flower food or a pinch of cane sugar from your kitchen cupboard into the vase." Make sure your flowers are kept away from direct sunlight.

If your hydrangeas are starting to wilt, Bladow recommends soaking the whole bouquet in cool water for around 45 minutes. Once done, shake off the excess water, trim the stem bottoms, and place them in fresh water with flower food. This might help rejuvenate your flowers and prolong their freshness.

Frequently Asked Questions

• Do hydrangeas require annual pruning?

  Most hydrangea types benefit from being pruned each winter before the new growth season begins. Pruning encourages maximal blooming and larger flowers. It also allows you to shape the plant. Without pruning, the shrub can become tangled and unruly, and old, woody stems will result in fewer buds compared to fresh growth.

• How can you maintain hydrangeas in bloom?

  To keep your hydrangeas thriving, ensure they are properly spaced when planted. Crowding them can stunt their growth and heighten the risk of fungal diseases spreading quickly. Keep them out of direct sunlight, and make sure they are well-watered and fertilized throughout the growing season. Regularly apply mulch to prevent weeds, and remove dead flowers to encourage fresh blooms. Hydrangeas may require more care than other plants, but their stunning flowers are worth it.

• Should hydrangeas be deadheaded?

  Deadheading, or removing dead blooms, is essential for hydrangeas. To deadhead hydrangeas properly, cut the dead flower from the stem just above the first set of leaves. This helps the plant conserve energy for producing new flowers instead.