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porcelainflower (Hoya carnosa)

Hoya carnosa is an evergreen, vining or climbing perennial whose stems can twine, climb, or trail, making it suitable for hanging containers.

LightSources differ somewhat on light: several horticultural sources support bright indirect or filtered strong light, while others indicate that partial sun or some direct sunlight is acceptable; gradual acclimation is advis
WaterUse a well-drained medium and allow it to dry partly before watering again; water more fully during flowering, while during the resting period allow the medium to become nearly dry before watering and avoid prolonged wet
HumidityHoya carnosa prefers high humidity.
TemperatureA single source reports a minimum temperature of about 5 °C, so sources are few for this figure. It is described as suitable for USDA and RHS hardiness classifications and is frost tender; keep above freezing.
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Overview

Hoya carnosa is an evergreen, vining or climbing perennial whose stems can twine, climb, or trail, making it suitable for hanging containers.

Origin and habitat

Sources differ on its native range: it is described as native from eastern Asia through Southeast Asia and extending to Australia, while broader accounts also include India, China, Japan, Taiwan, Queensland, and Fiji; Taiwan species records list it as native to Taiwan. It can grow on tree trunks, rocks, or limestone in forests and may climb or grow as an epiphyte; records from Taiwan and China extend from lowland to higher-elevation habitats. It is suited to warm conditions, with cultivation sources emphasizing protection from frost and freezing and a preference for higher humidity.

Characteristics

Sources differ on mature height, placing it at about 400–800 cm, while a single source reports a mature spread of about 100–150 cm. It is reported to grow vigorously and has opposite, thick, somewhat succulent leaves with a waxy sheen, ranging from broadly ovate and elliptic to elongated ovate, with some approaching a heart shape. Sources differ in their descriptions of the flowers and flowering period: the thick, waxy, star-shaped flowers range from white or off-white to pale pink, often with pink or red centers, are grouped in umbel-like clusters, are distinctly fragrant, and can secrete sticky, sweet nectar; flowering is mainly from spring through summer, with some sources extending it into late summer. The fruit is spindle-shaped.

Light

Sources differ somewhat on light: several horticultural sources support bright indirect or filtered strong light, while others indicate that partial sun or some direct sunlight is acceptable; gradual acclimation is advised to avoid leaf yellowing from sudden exposure.

Watering

Use a well-drained medium and allow it to dry partly before watering again; water more fully during flowering, while during the resting period allow the medium to become nearly dry before watering and avoid prolonged wetness.

Humidity and airflow

Hoya carnosa prefers high humidity.

Temperature and dormancy

A single source reports a minimum temperature of about 5 °C, so sources are few for this figure. It is described as suitable for USDA and RHS hardiness classifications and is frost tender; keep above freezing.

Growing medium and mounting

Use a loose, fast-draining medium containing organic matter; it can adapt to loamy, sandy, or chalky soils across acidic, neutral, and alkaline conditions, provided drainage is good.

Feeding

Fertilizer can be applied regularly during the growing season, with sources describing periodic feeding in spring and summer or the use of slow-release fertilizer each season.

Propagation

It can be propagated from stem or semi-hardwood cuttings or by layering, and a Japanese source describes a suitable seasonal period for taking cuttings.

Common problems

Possible pests include mealybugs, with fungus gnats and thrips also recorded indoors. A single source reports that Hoya carnosa generally has few disease problems. A medium that is either too wet or too dry can cause leaf drop, while poor drainage and prolonged wetness can lead to root rot. It is sensitive to frost and should be kept from freezing conditions; outdoor cultivation is suited to sheltered, frost-free locations.

Identification

Hoya carnosa can be recognized by its thick, opposite leaves with a waxy sheen, climbing or trailing vine-like stems, and clustered, fragrant, star-shaped flowers with a waxy or porcelain-like appearance; the same perennial flower stalk can bloom repeatedly.

Photos

Hoya carnosa
📷 Yvan leduc · CC BY-SA 3.0 · source
Hoya carnosa
📷 no rights reserved, uploaded by 葉子 · CC0 · source
Hoya carnosa
📷 portioid, some rights reserved (CC BY), uploaded by portioid · CC BY · source

Sources