Hydrangea anomala subsp. petiolaris (Climbing Hydrangea)

Hydrangea anomala petiolaris, commonly known as Climbing Hydrangea, is a stunning deciduous vine cherished for its ability to cover structures and walls with lush foliage and beautiful flowers. This hydrangea variety is especially valued for its unique growth habit, which allows it to climb vertically, making it an excellent choice for those seeking to add vertical interest to their gardens.

This hydrangea is a member of the Hydrangeaceae family, which includes several popular garden varieties like Hydrangea paniculata (Panicle Hydrangea), Hydrangea arborescens (Smooth Hydrangea), Hydrangea macrophylla (Bigleaf Hydrangea), Hydrangea quercifolia (Oakleaf Hydrangea), and Hydrangea serrata (Mountain Hydrangea).

Description

Climbing Hydrangea is distinguished by its stunning white flower clusters, which bloom in late spring to early summer. These flowers are borne in large, flat-topped clusters, creating a beautiful display against the dark green foliage. The heart-shaped leaves provide a lush backdrop that enhances the overall appearance of the vine.

It is an extremely versatile vine with year-round interest that looks terrific climbing up a wall as it clothes it with its pretty foliage and delicate lacecap flowers.

Native Habitat

Native to the woodlands of Japan and Korea, Climbing Hydrangea thrives in shady, moist environments. It is commonly found in forested areas where it can climb on trees and other structures, making it well-suited for gardens that mimic these natural conditions.

Plant Type and Habit

The Climbing Hydrangea is a vigorous, large, deciduous climbing vine that clings to surfaces with aerial roots that attach to walls, fences, or trees, allowing it to climb vertically. This growth habit makes it an excellent addition to vertical gardens.

Size

The climbing hydrangea generally grows 30-50 feet (9-15 meters) tall and can spread up to 5-6 feet (1.5-1.8 meters) wide when fully established. It is slow to establish but quite vigorous after that. If unsupported, this vine can form a sprawling shrub, up to 3-4 feet tall (90-120 cm).

Its size and climbing nature make it an ideal choice for covering trellises, fences, and walls, creating a lush, green oasis in your garden.

Hydrangea Flowers

The flowers bloom in large clusters of white, flat-topped flower heads, reaching up to 8 inches (20 cm) in diameter. Resembling lacecap flowers, each cluster consists of tiny, creamy-white to greenish-yellow fertile flowers in the center surrounded by a ring of showy white sterile flowers. These stunning blooms are not only beautiful but also sweetly fragrant, making them a delightful addition to the garden.

The blooms typically appear in late spring to early summer, attracting pollinators.

Foliage

The foliage of Climbing Hydrangea is equally impressive. It has shiny, dark green, heart-shaped leaves that can grow up to 5 inches (12 cm) long. The leaves provide a dense cover, creating a lush green backdrop for the white flowers. In the fall, the foliage can turn shades of golden-yellow, adding seasonal interest to the landscape.

Bark

Exposed in winter, the trunk is equally attractive with its reddish-brown exfoliating bark on mature stems, adding a much-needed splash of color to the winter landscape.

Award

Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society for its noteworthy qualities.

Hardiness

Climbing Hydrangea is hardy in USDA zones 4-9, making it suitable for a wide range of climates. it is intolerant of hot and humid conditions.

Uses

Climbing Hydrangea is a versatile plant that can be used in various landscape applications. It is ideal for covering walls, trellises, and fences, creating stunning vertical gardens. Additionally, it can be planted near trees or large shrubs to enhance the overall landscape design. Its beautiful flowers and lush foliage make it a perfect choice for adding texture and color to outdoor spaces.

Wildlife

This hydrangea variety attracts a variety of wildlife, particularly pollinators such as bees and butterflies, drawn to its fragrant flowers. The dense foliage also provides shelter for various birds, contributing to the biodiversity of the garden.

Toxicity

According to the ASPCA, Hydrangea is considered toxic to pets, including dogs and cats. Ingesting any part of the plant can lead to symptoms such as vomiting and diarrhea, making it essential to keep this plant out of reach of curious animals. This plant can act as a skin allergen for some individuals. It is advisable to wear gloves and other protective equipment when handling this plant to prevent potential allergic reactions or skin irritations during care and maintenance.

Deer and Rabbits

Hydrangea anomala petiolaris is rabbit-resistant.

Invasiveness

This climbing hydrangea is not considered invasive. It maintains a well-behaved growth habit, allowing it to thrive without overwhelming neighboring plants.

Benefits

Climbing Hydrangea offers numerous benefits, including stunning floral displays, a long blooming season, and the ability to attract beneficial wildlife. Its versatility and ability to thrive in various conditions make it a prized choice for many gardeners.

Climbing Hydrangea Care

Light Requirements

Prefers partial shade to full shade. While it can tolerate full sun (if soils remain moist), it thrives best in areas with filtered sunlight, especially during hot summer months.

Soil

Thrives in fertile, well-drained soil. Adding organic matter can improve soil structure and fertility.

Watering

Requires regular watering, especially during dry spells. Keep the soil consistently moist but not soggy, as overwatering can lead to root rot. Mulching can help retain soil moisture.

Fertilizer

Climbing hydrangeas do not require feeding during their first three years. After this period, apply fertilizer in spring, just before new leaves emerge, only if you observe yellowing leaves. In such cases, use a 10-10-10 fertilizer. In late summer or fall, add a 1-inch (2.5 cm) layer of compost around the plant, topped with one to two inches (2-5 cm) of mulch. Everything you need to know about fertilizing hydrangeas.

Pruning

Climbing hydrangeas require minimal to no routine pruning, making them an ideal low-maintenance option for gardeners. Generally, they only need attention to remove any dead or damaged wood that may develop over time. This approach allows them to maintain their natural growth habit while still thriving beautifully. Learn how to prune your hydrangea to maximize flower production.

Propagation

Climbing hydrangeas can be propagated through several methods, including cuttings, seeds, and layering. To propagate by cuttings, take 4-6 inch sections in late spring and root them in moist potting soil. For seeds, collect them from ripe flower clusters and sow them in a suitable medium. Layering involves bending a stem to the ground, covering it with soil, and allowing it to root before separating from the parent plant. Discover how to propagate your hydrangea for more beautiful blooms.

Overwintering

Continue watering your climbing hydrangea until the end of the growing season, ensuring it receives a thorough soaking before going dormant. Once the ground has frozen, apply a layer of composted manure or another organic compost mixture around the base to nourish the plant until spring. In warmer zones, add compost when temperatures begin to cool. Finally, cover the roots with a generous layer of mulch to help retain warmth. Learn how to prepare your hydrangea bush for winter.

Pests and Diseases

Watch for pests like aphids and spider mites. Powdery mildew, leaf spot, and root rot can occur in humid conditions. Regular monitoring and proper care can mitigate these issues. Popular pests and diseases affecting hydrangea plants.

Frequently Asked Questions

Do climbing hydrangeas like sun or shade?

Climbing hydrangeas prefer partial shade to full shade. While they can tolerate some sun, too much direct sunlight can cause leaf scorch and hinder their growth. Ideally, they thrive in locations that receive morning sun and afternoon shade.

What does climbing hydrangea look like in winter?

In winter, climbing hydrangeas lose their leaves, revealing their woody stems and branching structure. The bare vines can add visual interest to the landscape, and the peeling, exfoliating bark provides texture against the winter backdrop.

How hardy are climbing hydrangeas?

Climbing hydrangeas are hardy in USDA zones 4-9, making them suitable for a wide range of climates. They can withstand cold winters and adapt well to different growing conditions.

What is the growth rate of climbing hydrangea?

Climbing hydrangeas are considered slow to moderate growers, typically growing about 1-2 feet per year. They can take several years to establish before they start to spread significantly.

How long does it take for climbing hydrangea to bloom?

Climbing hydrangeas generally take about 3-5 years to bloom after planting. Once established, they produce beautiful, creamy white flower clusters in summer, adding charm to any garden.

Is climbing hydrangea invasive?

Climbing hydrangeas are not typically considered invasive. They are generally well-behaved and won’t spread aggressively, making them a good choice for vertical gardening without overwhelming other plants.

Does a climbing hydrangea need a trellis?

Yes, climbing hydrangeas require a support structure, such as a trellis, fence, or wall, to climb on. They use aerial roots to attach themselves to surfaces, allowing them to grow upwards and spread.

Does climbing hydrangea spread?

Yes, climbing hydrangeas can spread as they grow. They can reach a height of 30-50 feet with proper support and can spread laterally as well, depending on the available space and support structure. However, they are not invasive and can be managed with regular pruning.