Hoya
Hoya
Also known as: wax plant, wax vine, porcelain flower, Hoya carnosa
How do you care for a Hoya?
Light: Bright light, dappled shade or full morning sun; not full sun all day. Missouri Extension notes hoyas need high light to flower. Water: Let the free-draining mix dry between waterings. Soggy mix and wet roots are not tolerated. It is non-toxic to cats and dogs.
About Hoya
Hoya is a genus of more than 550 epiphytic vines from Asia and the western Pacific, grown for thick, waxy leaves and clusters of star-shaped flowers. NC State Extension recommends bright light or morning sun, a free-draining organic mix that dries between waterings, and leaving old flower spurs in place because they rebloom. The ASPCA lists wax plant (Hoya carnosa) as non-toxic to cats and dogs.
Hoya quick facts
- Botanical name
- Hoya
- Family
- Apocynaceae (dogbane family)
- Native to
- Tropical and subtropical Asia and the western Pacific
- Light
- Bright light, dappled shade or full morning sun; not full sun all day. Missouri Extension notes hoyas need high light to flower.
- Water
- Let the free-draining mix dry between waterings. Soggy mix and wet roots are not tolerated.
- Flowers
- Most plants do not bloom until 2 to 3 years old. Do not cut off the flower spurs (peduncles); they bloom again.
- Repotting
- Tolerates being pot-bound; move up no more than 5 cm (2 in) in pot size.
- Propagation
- Stem cuttings.
- Cats and dogs
- Non-toxic. The ASPCA lists wax plant (Hoya carnosa) as non-toxic to dogs and cats. Other Hoya species are not individually listed. Source: ASPCA
Sources: NC State Extension: Hoya; NC State Extension: Hoya carnosa; ASPCA: Wax Plant
Hoya care at a glance
- Light
- Bright indirect. Thrives in bright, indirect light. Some morning sun is tolerated. Too little light reduces flowering. Grow lights: Thrives under artificial grow lights (LED or fluorescent, 10-12 hours/day). A great option if your space lacks natural light.
- Watering
- Water every 7-14 days. Look for: leaves become soft and slightly wrinkled. soil should dry completely between waterings.
- Humidity
- Prefers 40-60% humidity. Average home humidity usually works fine, but give it a boost in winter when heating dries the air.
- Temperature
- Comfortable between 60-80°F. Keep away from cold drafts and heating vents.
- Soil
- Well-draining orchid or succulent mix with added perlite and bark.
- Pets
- The ASPCA lists wax plant (Hoya carnosa) as non-toxic to dogs and cats. Other Hoya species are not individually listed.
- Difficulty
- Intermediate
Hoya care tips
- Never remove the spent flower stalks (peduncles) – Hoyas bloom repeatedly from the same spurs, and cutting them off eliminates future flowers.
- Use a orchid bark-based potting mix with excellent drainage; Hoyas are epiphytes and hate sitting in wet soil.
- For maximum blooms, provide bright indirect light and a slight temperature drop at night (10-15°F difference).
- Water thoroughly only when the soil is completely dry – the thick leaves will tell you when they're thirsty by becoming slightly soft.
- Hoyas bloom more readily when slightly root-bound; only repot when roots are visibly circling the pot.
Treat your Hoya like the epiphytic climber it is: give it something to cling to, let it dry out completely between waterings, and resist the urge to repot frequently. The secret to those gorgeous porcelain flowers is patience, bright light, and leaving those bloom spurs alone.
Common Hoya problems, answered
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Hoya Wrinkled Leaves: Thirst or Damaged Roots?
Wrinkled hoya leaves mean the leaves are short of water. Either the mix has stayed dry too long, or roots damaged by wet, poorly drained mix can no longer take up water.
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Hoya Not Blooming? Light, Age and Peduncle Care
A healthy hoya that won't bloom is usually short of light, too young, or has lost its flower spurs (peduncles) to pruning. Oversized pots, winter feeding, and sudden changes during bud set also hold flowers back.
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Whiteflies on Hoya: Identify, Trap and Treat
Tiny white, moth-like insects that fly up when a hoya is disturbed are whiteflies. They suck sap from leaf undersides, leave sticky honeydew, and can yellow leaves when numbers build.
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Hoya Yellow Leaves: Wet Roots, Light or Variegation?
Yellow hoya leaves most often go with mix that stays wet in a poorly draining pot. Long dry spells, harsh sun, cold, and nutrient shortage can also yellow leaves, and some cultivars are simply variegated.
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Hoya Root Rot Symptoms: What to Check and How to Save It
Hoya root rot shows as yellowing, limp or wrinkled leaves while the mix stays wet, often with soft, dark stems at the soil line. The roots themselves are brown to black, mushy, and lose their outer layer when pulled.
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Scale on the Back of Hoya Leaves: Identify and Remove It
Small, oval, tan to brown bumps on the back of hoya leaves, along the veins or on the leaf stalks, that stay put and flake off under a fingernail are scale insects. Brown soft scale, a common indoor species that feeds on Hoya carnosa, also leaves sticky honeydew.
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Why Is My Hoya Dropping Leaves? Wet Roots, Cold or Thirst
A hoya drops leaves mainly when its mix is wrong in either direction. Waterlogged, poorly drained compost is the most common cause, and the RHS also names cold in winter. NC State Extension says soil that is too wet or too dry can cause the leaves to drop. Cold water, drafts and mealybugs are the next things to check.
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Spider Mites on Hoya: Confirm Them and Get Rid of Them
Fine pale stippling on hoya leaves, tiny moving dots on the undersides and fine webbing between leaves and stems point to spider mites. On hoyas they usually build up in winter, when home heating dries the air.
Questions about Hoya
Is Hoya toxic to cats and dogs?
The ASPCA lists wax plant (Hoya carnosa) as non-toxic to dogs and cats. Other Hoya species are not individually listed.
How fast does Hoya grow?
Hoya grows at a slow to moderate rate indoors. Typical mature size: trailing vines up to 6 ft indoors.
How do I propagate Hoya?
Propagate Hoya by stem cutting or water propagation.
Is Hoya easy to care for?
Hoya is rated intermediate difficulty. It needs some attention but suits most plant owners.
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