Hoya

Hoya,Wax Plant, Porcelain Flower, Hindu Rope Plant

Hoyas are a vast genus of tropical, perennial, evergreen climbing or trailing plants native to Asia and Australia. They are famous for their thick, waxy, often glossy leaves and their clusters of small, star-shaped, fragrant flowers that resemble porcelain. Hoyas are epiphytic or lithophytic in nature, meaning they grow on trees or rocks rather than in soil. They are highly valued for their ease of care and unique foliage. Popular cultivated varieties include Hoya carnosa (standard Wax Plant), Hoya kerrii (Sweetheart Hoya), and Hoya publicalyx.

Care Guide

LIGHT

  • Prefers bright, indirect light to encourage blooming.
  • An East or West-facing window is ideal.
  • A few hours of direct morning sun can encourage growth and flowering.
  • Insufficient light will lead to sparse growth and failure to bloom.

WATER

  • As a semi-succulent, it is drought-tolerant. Allow the soil to dry out completely between waterings.
  • Water thoroughly when the leaves start to look slightly less plump or slightly wrinkled.
  • Overwatering is the most common cause of root rot and yellowing leaves.
  • Reduce watering significantly in the winter months.

SOIL

  • Needs a very light, airy, and extremely fast-draining potting mix.
  • A blend of orchid bark, perlite, and a small amount of potting soil works well, mimicking its epiphytic nature.
  • Excellent aeration is essential for the thick, fleshy roots.

GROWTH HABIT

  • Ideal conditions: Bright, indirect light, warm temperatures (65-80F), and moderate to high humidity.
  • Growth rate & size: Growth rate is moderate to slow. It grows as a trailing or climbing vine and can reach many feet in length, depending on the support structure.

PROPAGATING

  • Propagated easily from stem cuttings with at least one node.
  • Root cuttings in water, moist perlite, or a chunky potting mix in a warm spot.
  • They are slow to root, sometimes taking weeks or months.

PRUNING

  • Pruning is minimal and primarily for shaping or controlling size.
  • NEVER remove the flower spurs (the small, woody stalks where flowers bloom); new blooms will emerge from the same spur repeatedly.
  • Remove old, yellowed, or damaged leaves along the vine.

REPOTTING

  • Hoyas prefer to be extremely pot-bound (root-bound), which encourages flowering.
  • Repot only when absolutely necessary (roots are circling tightly) every 3-5 years.
  • Repot in spring or early summer using a pot only slightly larger than the current one.

FERTILIZING

  • Feed lightly during the spring and summer growing season (monthly).
  • Use a balanced liquid fertilizer diluted to half strength.
  • A fertilizer higher in phosphorus (middle number) can be used to encourage blooming.

FLOWERING

  • Produces clusters of small, fragrant, star-shaped flowers that often drip nectar.
  • The plant must be mature and root-bound to flower.
  • Requires maximum bright, indirect light to encourage bud formation.

TOXICITY

  • Hoyas are generally considered non-toxic to humans and pets.

PRO TIPS

  • If the plant is not blooming, the problem is almost always insufficient light or repotting too often.
  • They look great when grown in hanging baskets or trained up a trellis or moss pole.
  • Clean the waxy leaves occasionally with a damp cloth to maximize light absorption.

Variability in Care

Most varieties of this plant follow the standard care above, but some require adjustments.

Thick-Leaved/Succulent Hoyas

Examples: Hoya kerrii, Hoya obovata, Hoya compacta (Hindu Rope)

  • Have very thick, rigid leaves that store a large amount of water.
  • Should be allowed to dry out more completely between waterings than thin-leaved types.
  • Are slower-growing and less forgiving of low light.

Thin-Leaved/Vining Hoyas

Examples: Hoya linearis, Hoya bella, Hoya retusa

  • Have thinner, softer leaves or a delicate trailing habit.
  • Need more frequent watering and higher humidity to prevent rapid desiccation.
  • Often prefer cooler temperatures and less intense light than the thick-leaved types.

Variegated Cultivars

Examples: Hoya carnosa 'Krimson Queen', Hoya carnosa 'Tricolor'

  • Have sections of the leaf (often white or pink) that lack chlorophyll.
  • Require the brightest indirect light to maintain their variegation and prevent the white/pink areas from turning green.
  • Are generally slower-growing than their all-green counterparts.

Plants for Sale

View all