Photo by Melody

PlantFiles: Hoya, Australian Waxflower, Wax Plant, Porcelain Flower
Hoya australis

Family: Asclepiadaceae (ass-kle-pee-ad-AY-see-ee) (Info)
Genus: Hoya (HOY-a) (Info)
Species: australis (aw-STRAL-iss) (Info)

Synonym:Hoya australis subsp. australis

One vendor has this plant for sale.

18 members have or want this plant for trade.

Tropicals and Tender Perennials
Vines and Climbers

15-20 ft. (4.7-6 m)

3-6 in. (7-15 cm)

USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Sun to Partial Shade

Parts of plant are poisonous if ingested

Bloom Color:
White/Near White

Bloom Time:
Late Summer/Early Fall


Other details:
Flowers are fragrant
This plant is suitable for growing indoors
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
From herbaceous stem cuttings
From woody stem cuttings
From softwood cuttings

Seed Collecting:
Bag seedheads to capture ripening seed
Allow pods to dry on plant; break open to collect seeds
Seed does not store well; sow as soon as possible

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By ideboda
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There are a total of 14 photos.
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2 positives
2 neutrals
No negatives

Gardeners' Notes:

Positive plantladylin On Nov 1, 2009, plantladylin from South Daytona, FL (Zone 9b) wrote:

I have two different Hoya australis plants and could never remember which was which, until I learned from a very knowledgeable person here on the DG Hoya Forum how to distinguish one from the other. This plant, Hoya australis ssp. australis, has pubescent leaves (soft tiny hairs). To me, the underside of the leaves feel even softer and fuzzier than the top. My plant is small and hasn't bloomed yet, but I look forward to seeing signs of peduncles, buds, and especially those beautiful fragrant blooms!

Neutral palmbob On Sep 9, 2007, palmbob from Acton, CA (Zone 8b) wrote:

This is one of the more arid tolerant species, needing very little humidity in its care (unlike the majority of species which prefer some humidity). It is one of the more ideal Hoyas for those with cactus collections who want a Hoya in their succulent cold frames.

Neutral Hoyamoyen On Dec 7, 2005, Hoyamoyen from Aarschot
Belgium (Zone 3a) wrote:

There are more than one subspecies of this Hoya.

Positive ideboda On Dec 15, 2002, ideboda from T-village ;) - Friesland
Netherlands (Zone 6a) wrote:

Plant originates from the east of Australia (Queensland, New South Wales), where it lives in rainforests. It is the most common Hoya of the 7 species occurring in Australia.
(The genus Hoya contains about 200 different species).
It can be grown in subtropical and tropical gardens; for colder climates it is more suitable as a houseplant.
It needs a support for its long vines, it forms stems that can be several metres long.
The milky juice in the stems is poisonous.
The fragrant waxy flowers, growing in umbels, attract insects. When growing indoors, green aphids may attack and spoil the flowers (the same as with other Hoya species).
Cuttings with a few leaves root easily in potting-soil.
The name Hoya is derived from Thomas Hoy, an English gardener.
There is one more subspecies, H. australis ssp. sana, which has narrower, pointed leaves.


This plant has been said to grow in the following regions:

Miami, Florida
Palm Bay, Florida
Kailua Kona, Hawaii
Kurtistown, Hawaii
Dennis Port, Massachusetts

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