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Hoya imperialis

Pronunciation: HOY-a im-peer-ee-AL-is
Family: Asclepiadaceae
Common Name: Hoya imperialis
Plant Type:
  • vines and climbers
  • perennial
  • succulent and cactus
Height to: 20 feet
USDA Hardiness Zones:
  • 70 to 60ºF ZONE 13
  • 80 to 70ºF ZONE 14
Sun Exposure:
  • full sun
Bloom Season:
  • mid summer
  • late summer
Bloom Description: Hoya imperialis produces umbels, to 8in (20cm) across, of 7-12 star-shaped, reddish brown to purple-brown flowers, to 3in (8cm) across, with white coronas.
Soil Type: Under glass, grow in soil-based potting mix with equal parts added leaf mold, sharp sand, ground bark and charcoal. Outdoors, grow in fertile, moist well-drained soil
Toxic:
  • No
Pests and Diseases: Mealybugs and scale insects may occur under glass.
Propagation: Sow Hoya imperialis seed at 66-75ºF (19-24ºC) in spring. Root semi-ripe cuttings with bottom heat in late summer. Layer in spring or summer.
Native to: Malaysia
Winter Sowing Zones: None
Notes for Identification:

Hoya imperialis is a strong-growing, twining climber producing thickly downy stems and narrowly oblong to elliptic, leathery, fleshy, mid-green leaves, 6-9" long,with wavy margins.

Do not remove old flower stalks because new inflorescences develop on them. Flowers may be followed by long, cylindrical seeds with tufts of hair. Pruning group 11, after flowering.

Source: Various sources including The American Horticultural Society A to Z Encyclopedia of Garden Plants and the USDA

 

USDA Heat Zones (days above 86ºF):
  • 150 to 180 days ZONE 10
  • 180 to 210 days ZONE 11
  • Greater then 210 ZONE 12
Seed photo: 0
Seed Label: 0
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