Sargent hydrangea Hydrangea aspera subsp. sargentiana
ABOUT
The Hydrangea aspera subsp. sargentiana, commonly known as "rough-leaved hydrangea," is easily recognizable by its striking foliage and showy flowerheads. This plant bears large, velvety leaves that have a coarse texture and are heart-shaped with serrated edges. The leaves display a lush green color that adds a luxuriant feel to the plant's overall appearance. The rough-leaved hydrangea is particularly admired for its large, dome-shaped flower clusters that emerge during its blooming period. These clusters comprise two distinct types of flowers: the central ones are small and less noticeable, while the outer ring consists of lavish, showy florets that can be typically shades of mauve, blue, or pink, depending on soil acidity. These larger florets are sterile and serve to attract pollinators to the more inconspicuous fertile flowers in the middle. The blooms are supported by sturdy stems that contrast with the soft, downy undersides of the leaves. This appealing combination of textural foliage and captivating blooms makes the rough-leaved hydrangea a favorite among gardeners who seek to add a touch of wilderness and charm to their garden landscapes.
About this plant
NamesFamily
Hydrangeaceae
Synonyms
Sargent's Hydrangea, Rough-leaf Hydrangea, Sargentiana Hydrangea
Common names
Hydrangea aspera var. robusta, Hydrangea robusta.
ToxicityTo humans
Hydrangea, which includes the subspecies Hydrangea aspera subsp. sargentiana, is considered to have a mild level of toxicity to humans. The plant contains compounds called cyanogenic glycosides, which can release cyanide when chewed or digested. If ingested, parts of the plant can potentially cause gastrointestinal upset, with symptoms such as nausea, vomiting, and diarrhea. The leaves and buds are known to have higher concentrations of these toxic compounds. Ingesting large quantities could potentially lead to more serious symptoms due to cyanide toxicity, such as dizziness, fast heartbeat, and labored breathing. However, severe poisonings are rare as a considerable amount of plant material would need to be consumed.
To pets
Hydrangea, including Hydrangea aspera subsp. sargentiana, is also toxic to pets, including dogs and cats. The toxicity arises from the presence of cyanogenic glycosides found throughout the plant, particularly in the leaves, buds, and flowers. If pets consume parts of a hydrangea plant, they could experience symptoms of poisoning, which may include vomiting, diarrhea, lethargy, and depression. In large enough amounts, the toxicity could lead to more severe symptoms such as difficulty breathing, increased heart rate, and in extreme cases, seizures or coma. Pet owners should keep hydrangeas out of reach and contact a veterinarian if they suspect their pet has consumed any part of the plant.
CharacteristicsLife cycle
Perennials
Foliage type
Deciduous
Color of leaves
Green
Flower color
Mixed
Height
10 feet [3 meters]
Spread
6 feet [1.8 meters]
Plant type
Shrub
Hardiness zones
7
Native area
China
Benefits
General Benefits- Aesthetic Appeal: Hydrangea sargentiana is known for its large, striking foliage and beautiful, large flower heads, which can add visual interest to gardens and landscapes.
- Habitat for Wildlife: The flowers provide nectar for pollinators such as bees and butterflies, while the dense foliage can offer shelter for small birds and other wildlife.
- Erosion Control: The shrub's root system can help stabilize soil and prevent erosion, particularly on slopes or in areas prone to heavy rain.
- Seasonal Interest: This plant offers a long period of interest from early summer to late fall, with changing leaf colors adding to its ornamental value.
- Shade Tolerance: Hydrangea sargentiana is capable of growing in partial shade, making it a versatile choice for different parts of a garden.
Medical Properties- This plant is not used for medical purposes.
Air-purifying QualitiesThis plant is not specifically known for air purifying qualities.
Other Uses- Deciduous Hedge: Hydrangea aspera subsp. sargentiana can be used to create an attractive, loosely-structured hedge with its large leaves and striking blooms providing a visual barrier in gardens.
- Specimen Plant: Due to its large size and distinctive, textured leaves coupled with showy flower heads, it makes an excellent specimen plant in landscape design for focal interest.
- Livestock Fodder: In some rural contexts, the leaves may serve as emergency fodder for livestock, though this is not a common or recommended use.
- Erosion Control: The dense root system can help stabilize soil and prevent erosion on slopes or in areas prone to soil degradation.
- Dye Production: The flower color varies with soil pH, which has historically been used as a natural indicator for soil properties, and potentially for dyes.
- Natural Fencing: The plant can be used to form part of a 'living fence', adding both privacy and beauty to property boundaries.
- Shelter for Wildlife: These shrubs can provide shelter and nesting sites for various bird species, as well as a habitat for beneficial insects.
- Cultural Symbolism: In some cultures, hydrangeas may carry symbolic meaning and can be planted in gardens as part of traditional practices or beliefs.
- Education and Research: It can be used in educational settings or botanical gardens to teach about pollination, plant physiology, and plant taxonomy.
- Artistic Inspiration: Artists and photographers may use the striking appearance of Hydrangea aspera subsp. sargentiana as a muse for artistic works or garden photography.
Interesting Facts
Feng ShuiThe rough-leaved hydrangea is not used in Feng Shui practice.
Zodiac Sign CompitabilityThe rough-leaved hydrangea is not used in astrology practice.
Plant Symbolism- Emotion: Hydrangeas often symbolize heartfelt and deep emotions, whether it be heartache or intense joy.
- Understanding: These plants can signify a deep understanding between people, possibly due to their multi-layered, complex blooms.
- Gratitude: Hydrangeas, especially in their opulent bouquets, are given to express thanks or for being understood.
- Apology: In some contexts, hydrangeas may be given to apologize or to show remorse, especially in Japan.
- Frivolity: With their lush and excessive flowerheads, hydrangeas can represent vanity or boastfulness.
- Perseverance: The robust nature of the Hydrangea aspera subsp. sargentiana can embody determination and endurance.
- Abundance: The voluminous blossoms can signify abundance and prosperity.
WaterRough-leaf hydrangea should be watered deeply once a week, providing about 1 to 1.5 gallons of water per session to ensure adequate moisture for its root system. During hot or dry periods, increase the frequency to twice a week. Always check the soil before watering; it should be moist but not waterlogged. Reduce watering in the winter months when the plant is dormant, providing water only if the soil becomes very dry. Ensure proper drainage to prevent root rot.
LightRough-leaf hydrangea thrives in dappled sunlight or partial shade. It's best placed where it can receive morning sun and afternoon shade, as harsh afternoon sun can scorch the leaves. An eastern or northern exposure usually offers the ideal lighting conditions for this hydrangea.
TemperatureRough-leaf hydrangea prefers a temperature range between 60°F to 75°F for optimal growth. It can withstand minimum temperatures down to around 20°F. Its ideal temperature conditions are typical of temperate climates, and it should be protected from extreme heat above 95°F.
PruningPrune rough-leaf hydrangea after blooming, typically in late summer, to remove spent flowers and any dead or crossing branches to encourage healthy growth and blooms for the next season. Pruning can be done annually, but avoid over-pruning as the plant flowers on old wood. The best time for a more extensive pruning is every few years to maintain shape and vigor.
CleaningAs needed
SoilSargent's hydrangea prefers well-drained soil rich in organic matter and consistent moisture. A soil mix with equal parts garden soil, peat moss, and perlite would be ideal. The soil pH should be acidic to mildly acidic, around 5.0-6.5, which helps to enhance the blue and purple tones in the flowers.
RepottingSargent's hydrangea, being a larger shrub, doesn't typically require frequent repotting. It's often planted directly in the garden rather than a pot. If grown in containers, assess annually, but repotting may only be necessary every 2-3 years to refresh the soil or accommodate root growth.
Humidity & MistingSargent's hydrangea enjoys high humidity levels to thrive. Best humidity conditions range from 60% to 80%. This mimics its natural habitat and supports its lush foliage and flower development.
Suitable locationsIndoor
Ensure bright light, high humidity, and moist soil.
Outdoor
Place in partial shade, mulch well, and protect from strong winds.
Hardiness zone
7-9 USDA
Life cycleHydrangea aspera subsp. sargentiana, commonly known as Rough-leaved Hydrangea, begins its life cycle when seeds germinate in moist, well-draining soil, typically in spring or early summer. Seedlings emerge and develop into juvenile plants, growing larger leaves and stems; young plants require partial shade and protection from strong winds. As it matures, the Rough-leaved Hydrangea enters a vegetative stage characterized by the development of large, velvety leaves and sturdy branches, and this stage can last several years as the plant establishes itself. The reproductive stage commences when the plant blooms typically in late summer, producing large, lacecap flowers with fertile centers surrounded by infertile florets, which attract pollinators. After pollination, flowers develop into seed capsules that, once dry, release seeds to start a new generation; meanwhile, the plant may experience seasonal dormancy during colder months. This cycle of growth, reproduction, and dormancy repeats annually, with proper care allowing the Rough-leaved Hydrangea to thrive and live for many years.
PropogationPropogation time
Spring-early summer
The most popular method of propagating Hydrangea aspera subsp. sargentiana, commonly known as Sargent's hydrangea, is through softwood cuttings. This is typically done in late spring or early summer when the new growth is still tender and flexible. To propagate, a gardener should select a healthy stem with a few leaves and make a cut just below a leaf node, about 4-6 inches (10-15 cm) long. It's important to remove the lower leaves and dip the cut end into a rooting hormone before potting it into a mix of peat and perlite. The cutting should then be placed in a warm, shaded area and kept moist. Roots usually develop within a few weeks, after which the cutting can be transferred to a larger pot or directly into the garden.
