Hoya Plant: How To Care For The Wax Plant

Called the Hoya plant – climbing, clambering, creeping, or wax-stemmed plant with a thick wax leaf makes an excellent house plant.

Known as the “Hindu rope plant”, “wax plant” or “wax flower”, Hoya has been enjoyed for decades, perhaps because fanciers enjoy their easy going as a houseplant indoor dispositions.

hoya plant bloom

Their wheel-like clusters of waxy or porcelain flowers with stars in their crowns, are sometimes deliciously fragrant although I think the gardenia beats it for fragrance.

History Of The Hoya Plant

The name “Hoya” honors Thomas Hoy, gardener to the Duke of Northumberland and the first to bring this superb house plant into prominence.

Native to southern India, highly prized, and the subject of legend. You’ll find Hoyas throughout eastern Asia to Australia and classified botanically in the asclepias (milkweed) family.

The exact number of species is a mystery. Bailey’s Standard Cyclopedia of Horticulture estimates there are 100 species. Listed at the end of the article are over 550 recoginized species. The most common species, and the one most often seen and grown as a houseplant is Hoya carnosa and Hoya carnosa variegata.

Thick leaves of green, rimmed with red and white, and a waxen texture from which it derives the nick-name “wax plant.”

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Hoya Flowers Exquisite Creations

hoya-flower

In a sunny window the foliage is unusually decorative, and their late spring and summer flowers are highly prized.

Some consider Hoya blooms among the most exquisite creations of nature, seemingly fashioned from ivory or porcelain, with glimmering centers of ruby and amethyst. The blossom of Hoya carnosa carries a delicate, elusive fragrance which is barely noticeable.

The waxen ball of five-pointed, double stars, is geometrically perfect; giving the bloom an artificial look. Those experiencing Hoya carnosa for the first time are pleasantly surprised to find it is real.

TIP: Do not touch or move the Hoya plant during its blooming period.

Hoya Leaves & Foliage – Striking & Variable

The striking foliage of Hoya carnosa variegate with its succulent foliage is quite variable, and sometimes changes as the plant matures.

The compact form – Hoya carnosa compacta, a curious variation with crumpled foliage, puts out one of the most spectacular blooms of the species.

How To Care For The Hoya Plant… It Does Not Require Pampering

Native to tropic and subtropical regions, most hoyas do equally well in homes, in protected areas or a greenhouse. The hoyas that vine and climb do so by means of small stem rootlets, when untrained, they form a thick mat. Several species make beautiful baskets and look great on a small trellis.

Lighting – a north window is a good location. Although the plants do not require direct light, they would not do well away from a window, unless you prefer to grow them under fluorescent grow lights. Supply all but the hottest sun.

hoya-varigeated-809

Soil – a moist, well-drained, light soil – African Violet soil with some added perlite – is a good growing medium.

Watering – keep the soil moist in spring and summer, dry but not to the point of shriveled foliage in winter. In dry climates more frequent watering may be necessary.

Some like to mist the leaves frequently, to clean them and increase humidity… but NOT when the plant is budding or in flower.

Temperature – give them medium (50 degrees) to warm temperatures during the growing season—spring and summer. The plants go semi-dormant in winter.

Fertilizer – In spring hoyas react favorably to feeding. A fertilize with liquid balanced food, about every four weeks, three or four times during the growing season will produce a vigorous growth. Withhold food during the winter. More on liquid food here.

hoya-flower-reddit-04302015

Blooms appear in spring and summer when the plant is most active. Lack of water or too much fertilizer will cause foliage to brown around the edges and perhaps leaves will drop.

As with most plants, Hoyas respond to good care. However, they resent pampering, hovering, and constant handling and moving.

One Hoya peculiarity worth noting: They produce blooms on knobby spurs which stay on the plant even after blossoms fade. New buds will be generated there to provide bloom the next time. The lesson to learn: to encourage prolific blooming, leave the flower spurs on the plant.

Also, for fuller flowering, most growers recommend tho keep the roots pot-bound.

What To Do When Your Hoya Is Not Blooming?

Question: I have an 8 year old Hoya vine, growing long vines but never flowers. What can I do to make it produce flowers? HB, Minnesota

Answer: Many home hoya growers cannot get their plant to bloom. Plants flourish best in bright light, in humid air, with ample moisture at the roots. But, hoyas need a break.

During winter keep the plants cool, 50 degrees, and rather dry. Continued high temperature, fertilizer (liquid), and moisture promotes leaf and stem growth and prevents the formation of flower buds.

After buds set, you can increase the temperature again slightly.

Hoya Bloom Time Lapse

The How To’s Of Hoya Plant Propagation

Propagate Hoya plants from cuttings of top growth, or by leaf cuttings in the same manner as African violets and gloxinias. The average cutting or leaf start will produce a blooming plant in two years or less.

The easiest method of propagation is by air-layering. Layers mature faster and do not need as much patience. Pin down a stem, at the joint, in a moist rooting medium. Sever and pot the new plant after roots form.

I have taken a mature Hoya variegata; severed and planted every leaf and stem; and in less than a year have produced 78 healthy plants! For an excellent starting medium try a commercial African violet soil and I prefer small clay tree cotta pots over plastic, although either can use either.

Tips For Rooting Hoya in Water

The most fetching hanging vase I’ve ever seen was a brown jug filled with rooted wax plant cuttings, all growing in water.

The glass of the jug was barely transparent. They used three kinds of wax plants:

  • Hoya carnosa (plain green leaves)
  • The variegated form of carnosa
  • Hoya bella (miniature)

I made a similar planting, and gave the vines food by following the directions on a tub of soluble houseplant fertilizer. However, the vines will thrive unbelievably long without any food in the water.

Seeds Are Scarce

Starting seeds is almost unheard of because the blooms seldom produce seeds. It seems that pollination is a difficult business which in nature is carried out by an insect foreign to the United States.

Hoya Pest and Problems

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Hoya has remarkably few pests. The worst is the root-knot nematode. Because of it the hoya is rarely grown out-of-doors in Florida and other frost-free sections where climate would permit. If there is a nematode within 100 miles, it seems to seek the hoya and destroy it.

Aphids enjoy the sweet juices of the hoya, but most common house plant insecticide sprays, Neem oil or and insecticidal soap will easily control them. Fungus gnat can at times become a problem.

Mealybugs sometimes attack, use the same control for Aphids. Ants (which accompany aphids), and red spider mites can be kept away by periodic application of a malathion spray.

If you do find a hoya dying from a nematode infection, you can salvage leaf and stem cuttings to start new plants. Discard and destroy the roots and soil of an infected plant.

Commonly Grown Hoya “Species”

Hoya australis – has huge, waxen, deep-green leaves measuring nearly four inches across, and splotched with silver. It is a vigorous, strong grower, vining kind with distinctly fragrant flowers, pink with red crowns.

Hoya bandaensis – Sturdy plant with deep-green glossy leaves.

Hoya bella – is a handsome dwarf, small growing species with slender upright branches that droop down as they age; a non climber, small leaves are thick, dark green; flowers are white with purple centers. An old favorite.

hoya-species

Hoya carnosa – Old-timer with shiny dark-green oval-pointed leaves, spreading sprays of faint pink flowers centered with a red star-crown. This one climbs best by sinking its aerial roots into a porous support like a moss pole.

Several variations are available: ‘Exotica,’ with green leaves centered with cream, sometimes pink-tinged; variegata, the leaves irregularly edged with creamy-white, touched with pink in sun.

Hoya coronaria – is a climber, not widely available, with waxy leaves that re-curve and are hairy beneath. It has pale lemon yellow flowers with red spots.

Hoya imperialis – Stems and leaves dusted with down, margins curled; large red-brown flowers with creamy centers.

Hoya keysi – has thick close-jointed stems and heavy, gray-green leaves covered with down, off-white flowers, red base.

Hoya latifolia (cinnamonum) – Egg-shaped coppery leaves with paler veins.

Hoya longifolia shepherdi (angustifolia) – Slender leaves indented at the center vein so they’re almost folded; delicate display of white flowers accented with bright wine.

Hoya macrophylla – Creeping species with light-veined, copper-green leaves, white flowers.

Hoya motoskei – Free-flowering vine (considered the true Hoya carnosa) has elliptical leaves of lighter green unevenly speckled with silver; with clusters of pinkish-white flowers with maroon centers.

Hoya multiflora – a stout, climbing plant, with large leathery leaves and pale yellow flowers; ‘Silver Leaf’ is a variety of multiflora with dark green leaves blotched with silvery pink.; red stems; hairy flowers the color of vintage wine, with a crown of silver-pink stars.

Family: Asclepiadaceae
Common Name: Wax Plant

Full List Of Hoya Species

Below is a list of 557 Hoya species, subspecies and varieties recognized by The World Checklist of Selected Plant Families at Kew as of September 1, 2017.

  • Hoya – 1810
  • Hoya acanthominima – 2013
  • Hoya acicularis – 2003
  • Hoya acuminata – 1883
  • Hoya aeschynanthoides – 1908
  • Hoya affinis – 1892
  • Hoya alagensis – 1990
  • Hoya albida – 2013
  • Hoya albiflora – 1895
  • Hoya aldrichii – 1890
  • Hoya alexicaca – 1824
  • Hoya alwitriana – 2012
  • Hoya amboinensis – 1907
  • Hoya amoena – 1950
  • Hoya amoena subsp. amoena
  • Hoya amoena subsp. bogorensis – 2014
  • Hoya amorosoae – 2014
  • Hoya amrita – 2011
  • Hoya andalensis – 2005
  • Hoya anncajanoae – 2008
  • Hoya anulata – 1905
  • Hoya apoda – 1916
  • Hoya apoensis – 2011
  • Hoya apoensis subsp. apoensis
  • Hoya apoensis subsp. sagittaria – 2013
  • Hoya archboldiana – 1937
  • Hoya arnottiana – 1834
  • Hoya attenuata – 1935
  • Hoya aurantiaca – 2009
  • Hoya aurigueana – 2012 publ. 2013
  • Hoya australis – 1830
  • Hoya australis subsp. australis
  • Hoya australis subsp. melanesica – 2008
  • Hoya australis subsp. nathalieae – 2012
  • Hoya australis subsp. oramicola – 1991
  • Hoya australis subsp. rupicola – 1991
  • Hoya australis subsp. sana – 1988
  • Hoya australis subsp. tenuipes – 1991
  • Hoya bacunganensis – 2014
  • Hoya baishaensis – 2009
  • Hoya bakoensis – 2015
  • Hoya balaensis – 2007
  • Hoya balansae – 1912
  • Hoya bandaensis – 1908
  • Hoya bandongii – 2011
  • Hoya barbonii – 2014
  • Hoya bawanglingensis – 2009
  • Hoya bebsguevarrae – 2013
  • Hoya beccarii – 2013
  • Hoya bella – 1848
  • Hoya benchaii – 2014
  • Hoya benguetensis – 1906
  • Hoya benitotanii – 2010
  • Hoya benstoneana – 2012 publ. 2013
  • Hoya benvergarae – 2008
  • Hoya betchei – 1978
  • Hoya bhutanica – 1979
  • Hoya bicknellii – 1999
  • Hoya bicolensis – 2012 publ. 2013
  • Hoya bicolor – 2003
  • Hoya bifunda – 2013
  • Hoya bifunda subsp. bifunda
  • Hoya bifunda subsp. integra – 2013
  • Hoya bilobata – 1906
  • Hoya blashernaezii – 1999
  • Hoya blashernaezii subsp. blashernaezii
  • Hoya blashernaezii subsp. siariae – 2014
  • Hoya blashernaezii subsp. valmayoriana – 2014
  • Hoya bonii – 1912
  • Hoya bordenii – 1906
  • Hoya brevialata – 2001
  • Hoya brittonii – 1992
  • Hoya brooksii – 1925
  • Hoya buotii – 2003
  • Hoya burmanica – 1920
  • Hoya burtoniae – 1990
  • Hoya buruensis – 1869
  • Hoya butleriana – 2013
  • Hoya cagayanensis – 1987
  • Hoya callistophylla – 2000
  • Hoya calycina – 1913
  • Hoya calycina subsp. calycina
  • Hoya calycina subsp. glabrifolia – 1992
  • Hoya campanulata – 1827
  • Hoya camphorifolia – 1904
  • Hoya capotoanensis – 2015
  • Hoya carandangiana – 2015
  • Hoya cardiophylla – 1920 publ. 1921
  • Hoya carmelae – 2010
  • Hoya carnosa – 1810
  • Hoya caudata – 1883
  • Hoya celata – 2013
  • Hoya celsa – 2013
  • Hoya cembra – 1990
  • Hoya chewiorum – 2014
  • Hoya chiekoae – 2013
  • Hoya chinghungensis – 1995
  • Hoya chlorantha – 1908
  • Hoya chloroleuca – 1913
  • Hoya chunii – 1984
  • Hoya ciliata – 1988
  • Hoya cinnamomifolia – 1848
  • Hoya clemensiorum – 2001
  • Hoya collettii – 1914
  • Hoya collina – 1913
  • Hoya columna – 2015
  • Hoya cominsii – 1891
  • Hoya commutata – 1995
  • Hoya concava – 2014
  • Hoya corazoniae – 2010
  • Hoya cordata – 1985
  • Hoya coriacea – 1827
  • Hoya coriacea subsp. coriacea
  • Hoya coriacea subsp. philippinensis – 2013
  • Hoya coronaria – 1827
  • Hoya corymbosa – 2013 publ. 2014
  • Hoya crassicaulis – 1995
  • Hoya crassicaulis subsp. capazensis – 2016
  • Hoya crassicaulis subsp. crassicaulis
  • Hoya crassior – 1936
  • Hoya cumingiana – 1844
  • Hoya cupula – 2013
  • Hoya curtisii – 1908
  • Hoya cutis-porcelana – 2013
  • Hoya daimenglongensis – 2012
  • Hoya danumensis – 2009
  • Hoya dasyantha – 1936
  • Hoya davidcummingii – 1995
  • Hoya dennisii – 1993
  • Hoya densifolia – 1848
  • Hoya desvoeuxensis – 2011
  • Hoya devogelii – 2011
  • Hoya deykei – 2000
  • Hoya dickasoniana – 1994
  • Hoya dictyoneura – 1905
  • Hoya dimorpha – 1898
  • Hoya diptera – 1866
  • Hoya dischorensis – 1913
  • Hoya diversifolia – 1827
  • Hoya diversifolia var. diversifolia
  • Hoya diversifolia subsp. el-nidicus – 2001
  • Hoya dolichosparte – 1916
  • Hoya eburnea – 2013
  • Hoya edanoi – 1993
  • Hoya edeni – 1883
  • Hoya eitapensis – 1913
  • Hoya elegans – 1834
  • Hoya elliptica – 1883
  • Hoya elmeri – 1929
  • Hoya endauensis – 1989
  • Hoya engleriana – 1907
  • Hoya epedunculata – 1913
  • Hoya erythrina – 1978
  • Hoya erythrostemma – 1939
  • Hoya espaldoniana – 2014
  • Hoya estrellaensis – 2012
  • Hoya excavata – 1863
  • Hoya exilis – 1913
  • Hoya faoensis – 2008
  • Hoya fauziana – 2015
  • Hoya ferrerasii – 2010
  • Hoya fetuana – 2003
  • Hoya filiformis – 1908
  • Hoya finlaysonii – 1834
  • Hoya fischeriana – 1904
  • Hoya fitchii – 2009
  • Hoya fitoensis – 2015
  • Hoya flavescens – 1913
  • Hoya flavida – 1993
  • Hoya forbesii – 1908
  • Hoya foxii – 2014
  • Hoya fraterna – 1849
  • Hoya fungii – 1934
  • Hoya fusca – 1830
  • Hoya fuscomarginata – 1910
  • Hoya galeraensis – 2015
  • Hoya gelba – 2013
  • Hoya gigantanganensis – 1992
  • Hoya gigas – 1913
  • Hoya gildingii – 2002
  • Hoya glabra – 1908
  • Hoya globulifera – 1849
  • Hoya globulosa – 1882
  • Hoya golamcoana – 1991
  • Hoya gracilipes – 1905
  • Hoya gracilis – 1908
  • Hoya graveolens – 1939
  • Hoya greenii – 1995
  • Hoya griffithii – 1883
  • Hoya guppyi – 1887
  • Hoya halconensis – 1990
  • Hoya halophila – 1913
  • Hoya hamiltoniorum – 2014
  • Hoya hanhiae – 2014
  • Hoya hernaezii – 2016
  • Hoya heuschkeliana – 1989
  • Hoya heuschkeliana subsp. cajanoae – 2007
  • Hoya heuschkeliana subsp. heuschkeliana
  • Hoya heuschkeliana subsp. marionii – 2014
  • Hoya histora – 2015
  • Hoya hypolasia – 1913
  • Hoya ignorata – 2011
  • Hoya ilagiorum – 2011
  • Hoya imbricata – 1844
  • Hoya imbricata subsp. imbricata
  • Hoya imbricata subsp. megapollinia – 2014
  • Hoya imperialis – 1846
  • Hoya inconspicua – 1894
  • Hoya incrassata – 1904
  • Hoya incurvula – 1916
  • Hoya inflata – 2007
  • Hoya irisiae – 2014
  • Hoya isabelaensis – 2011
  • Hoya isabelchanae – 2016
  • Hoya ischnopus – 1913
  • Hoya jianfenglingensis – 2011
  • Hoya jiewhoeana – 2016
  • Hoya josetteae – 2016
  • Hoya juannguoana – 2002
  • Hoya kanlaonensis – 2010
  • Hoya kanyakumariana – 1978 publ. 1979
  • Hoya kastbergii – 2003
  • Hoya kenejiana – 1913
  • Hoya kentiana – 1991
  • Hoya kerrii – 1911
  • Hoya kingdonwardii – 1994
  • Hoya kipandiensis – 2014
  • Hoya kloppenburgii – 2001
  • Hoya klossii – 1916
  • Hoya krohniana – 2009
  • Hoya kuhlii – 1912
  • Hoya kuhlii var. hasseltii – 1949
  • Hoya kuhlii var. kuhlii
  • Hoya lactea – 1914
  • Hoya lacunosa – 1827
  • Hoya lagunaensis – 2014
  • Hoya lambii – 2000
  • Hoya lambioae – 2015
  • Hoya lamingtoniae – 1898
  • Hoya lanceolaria – 1916
  • Hoya lanceolata – 1825
  • Hoya landgrantensis – 2009
  • Hoya lanotooensis – 2015
  • Hoya larrycahilogii – 2016
  • Hoya lasiantha – 1849
  • Hoya lasiogynostegia – 1984
  • Hoya latifolia – 1837
  • Hoya laurifolia – 1838
  • Hoya laurifoliopsis – 1936
  • Hoya lauterbachii – 1896
  • Hoya leembruggeniana – 1911
  • Hoya leucantha – 1916
  • Hoya leucorhoda – 1913
  • Hoya leytensis – 1988
  • Hoya liangii – 1936
  • Hoya limoniaca – 1921
  • Hoya linavergarae – 2006
  • Hoya lindaueana – 1911
  • Hoya linearis – 1825
  • Hoya linusii – 2014
  • Hoya lipoensis – 1985
  • Hoya lithophytica – 2012
  • Hoya lobbii – 1883
  • Hoya lockii – 2012
  • Hoya loheri – 1991
  • Hoya loheri subsp. loheri
  • Hoya loheri subsp. tanawanensis – 2015
  • Hoya longifolia – 1834
  • Hoya longipedunculata – 2012
  • Hoya lucardenasiana – 2009
  • Hoya lucyae – 2006
  • Hoya lutea – 1834
  • Hoya lyi – 1907
  • Hoya macgillivrayi – 1914
  • Hoya macrophylla – 1827
  • Hoya madulidii – 1990
  • Hoya magnifica – 1992
  • Hoya magniflora – 1984
  • Hoya mahaweeensis – 2015
  • Hoya maingayi – 1883
  • Hoya mappigera – 2012
  • Hoya marananiae – 2015
  • Hoya marginata – 1905
  • Hoya mariae – 2011
  • Hoya martinii – 2015
  • Hoya marvinii – 2013
  • Hoya mata-ole-afiensis – 2015
  • Hoya matavanuensis – 2011
  • Hoya maxima – 1863
  • Hoya maximowayetii – 2015
  • Hoya mcgregorii – 1906
  • Hoya medinillifolia – 2011
  • Hoya megalantha – 1915
  • Hoya megalaster – 1900
  • Hoya meliflua – 1918
  • Hoya meliflua subsp. escobinae – 2016
  • Hoya meliflua subsp. meliflua
  • Hoya memoria – 2004
  • Hoya mengtzeensis – 1974
  • Hoya meredithii – 1988
  • Hoya merrillii – 1904
  • Hoya micrantha – 1883
  • Hoya microphylla – 1913
  • Hoya microstemma – 1913
  • Hoya minahassae – 1916
  • Hoya mindorensis – 1906
  • Hoya mindorensis subsp. mindorensis
  • Hoya mindorensis subsp. sarawakensis – 2016
  • Hoya minima – 1912
  • Hoya minutiflora – 2010
  • Hoya mirabilis – 2012
  • Hoya mitrata – 1940
  • Hoya monetteae – 2004
  • Hoya moninae – 2014
  • Hoya montana – 1913
  • Hoya mucronulata – 1906
  • Hoya multiflora – 1823
  • Hoya myanmarica – 1994
  • Hoya myrmecopa – 2001
  • Hoya myrmecopa subsp. kapatalanensis – 2013
  • Hoya myrmecopa subsp. myrmecopa
  • Hoya nabawanensis – 2002
  • Hoya nakarensis – 2013
  • Hoya naumannii – 1908
  • Hoya navicula – 2015
  • Hoya neocaledonica – 1906
  • Hoya neoebudica – 1937
  • Hoya neoguineensis – 1886
  • Hoya nervosa – 1974
  • Hoya nicobarica – 1830
  • Hoya nummularia – 1883
  • Hoya nummularioides – 1912
  • Hoya nuttiana – 2013
  • Hoya nuuuliensis – 2008
  • Hoya nyhuusiae – 2003
  • Hoya obcordata – 1883
  • Hoya oblanceolata – 1883
  • Hoya oblongacutifolia – 1912
  • Hoya obovata – 1844
  • Hoya obscura – 1986
  • Hoya obtusifolia – 1834
  • Hoya occlusa – 1912
  • Hoya odetteae – 1998
  • Hoya odorata – 1906
  • Hoya odorata subsp. antoinsensis – 2015
  • Hoya odorata subsp. garciae – 2015
  • Hoya odorata subsp. odorata
  • Hoya odorata subsp. taytayensis – 2015
  • Hoya ofuensis – 2015
  • Hoya oleoides – 1913
  • Hoya oligantha – 1913
  • Hoya omlorii – 2011
  • Hoya onychoides – 1995
  • Hoya opposita – 1837
  • Hoya oreogena – 1939
  • Hoya oreostemma – 1913
  • Hoya orientalis – 1984
  • Hoya ormocensis – 2014
  • Hoya ottolanderi – 1911
  • Hoya ovalifolia – 1834
  • Hoya oxycoccoides – 1916
  • Hoya pachyclada – 1939
  • Hoya pachyphylla – 1900
  • Hoya pachypus – 1914
  • Hoya padangensis – 1916
  • Hoya palawanensis – 2015
  • Hoya palawanensis subsp. minor – 2015
  • Hoya palawanensis subsp. palawanensis
  • Hoya palawanica – 1990
  • Hoya pallilimba – 2001
  • Hoya panayensis – 2009
  • Hoya pandurata – 1939
  • Hoya papaschonii – 2014
  • Hoya papillantha – 1898
  • Hoya papuana – 1913
  • Hoya parasitica – 1834
  • Hoya parvapollinia – 2015
  • Hoya parviflora – 1834
  • Hoya parvifolia – 1908
  • Hoya patella – 1913
  • Hoya pauciflora – 1848
  • Hoya paulshirleyi – 2010
  • Hoya paziae – 1990
  • Hoya pedunculata – 1913
  • Hoya peekelii – 1927
  • Hoya pentaphlebia – 1918
  • Hoya perakensis – 1911
  • Hoya persicina – 2012 publ. 2013
  • Hoya persicina subsp. persicina
  • Hoya persicina subsp. rosea – 2013
  • Hoya persicinicoronaria – 2009
  • Hoya phuwuaensis – 2016
  • Hoya phyllura – 1931
  • Hoya piestolepis – 1913
  • Hoya pimenteliana – 1999
  • Hoya platycaulis – 2009
  • Hoya plicata – 1908
  • Hoya polilloensis – 2013
  • Hoya polyneura – 1883
  • Hoya pottsii – 1829
  • Hoya pruinosa – 1857
  • Hoya pseudoleytensis – 2013
  • Hoya pubens – 1912
  • Hoya puber – 1827
  • Hoya pubicalyx – 1918
  • Hoya pubicenta – 2014
  • Hoya pubicorolla – 2013
  • Hoya pubicorolla subsp. anthracina – 2013
  • Hoya pubicorolla subsp. pubicorolla
  • Hoya pulchella – 1913
  • Hoya purpurea – 1849
  • Hoya purpureofusca – 1850
  • Hoya pusilla – 1978
  • Hoya pusilliflora – 1916
  • Hoya pycnophylla – 1908
  • Hoya querinoensis – 2007
  • Hoya quinquenervia – 1904
  • Hoya quisumbingii – 1992
  • Hoya radicalis – 1974
  • Hoya ralphdavisiana – 2014
  • Hoya ramosii – 2007
  • Hoya ranauensis – 2014
  • Hoya recurvula – 2000
  • Hoya recurvula subsp. bokorensis – 2010
  • Hoya recurvula subsp. recurvula
  • Hoya reticulata – 1824
  • Hoya retrorsa – 2014
  • Hoya retusa – 1852
  • Hoya revolubilis – 1974
  • Hoya revoluta – 1883
  • Hoya reyesii – 2016
  • Hoya rhodostele – 1923
  • Hoya rhodostemma – 1913
  • Hoya rigida – 1939
  • Hoya rima – 2014
  • Hoya rintzii – 2014
  • Hoya rizaliana – 1991
  • Hoya rosarioae – 2015
  • Hoya rosea – 1905
  • Hoya rostellata – 2015
  • Hoya rotundiflora – 2011
  • Hoya rubida – 1905
  • Hoya rumphii – 1827
  • Hoya rundumensis – 2013
  • Hoya ruthiae – 2015
  • Hoya salmonea – 2013
  • Hoya salmonea subsp. pallida – 2013
  • Hoya salmonea subsp. salmonea
  • Hoya salweenica – 1974
  • Hoya samarensis – 2012
  • Hoya samarensis subsp. gutierrezii – 2014
  • Hoya samarensis subsp. samarensis
  • Hoya sammannaniana – 2014
  • Hoya samoensis – 1866
  • Hoya santafeensis – 2015
  • Hoya santiagoi – 2011
  • Hoya santiagoi subsp. mandozae – 2013
  • Hoya santiagoi subsp. santiagoi
  • Hoya sapaensis – 2011
  • Hoya sarcophylla – 1917
  • Hoya savaiiensis – 2009
  • Hoya savaiiensis subsp. falealupoensis – 2015
  • Hoya savaiiensis subsp. savaiiensis
  • Hoya schallertiae – 1982
  • Hoya schneei – 1921
  • Hoya scortechinii – 1908
  • Hoya seanwhistleriana – 2015
  • Hoya serpens – 1883
  • Hoya shepherdii – 1861
  • Hoya siamica – 1911
  • Hoya sigillatis – 2004
  • Hoya sigillatis subsp. paitanensis – 2014
  • Hoya silvatica – 1974
  • Hoya sipitangensis – 2002
  • Hoya smithii – 2009
  • Hoya soidaoensis – 2013
  • Hoya solaniflora – 1913
  • Hoya soligamiana – 2009
  • Hoya somadeeae – 2012
  • Hoya sororia – 1905
  • Hoya spartioides – 2001
  • Hoya stenophylla – 1913
  • Hoya stoneana – 2006
  • Hoya subcalva – 1901
  • Hoya subglabra – 1913
  • Hoya subquaterna – 1857
  • Hoya subquintuplinervis – 1869
  • Hoya sulitii – 2015
  • Hoya surigaoensis – 2010
  • Hoya sussuela – 1917
  • Hoya tamaleaaea – 2008
  • Hoya tamdaoensis – 2015
  • Hoya tangerina – 2014
  • Hoya tannaensis – 2011
  • Hoya tauensis – 2011
  • Hoya taytayensis – 2013
  • Hoya telosmoides – 1996
  • Hoya tenggerensis – 1950
  • Hoya teretifolia – 1883
  • Hoya thailandica – 2001
  • Hoya thomsonii – 1883
  • Hoya thuathienhuensis – 2012
  • Hoya tiatuilaensis – 2013
  • Hoya tjadasmalangensis – 1950
  • Hoya tjampeaensis – 1936
  • Hoya tomataensis – 2004
  • Hoya torricellensis – 1913
  • Hoya trigonolobos – 1905
  • Hoya trukensis – 1937
  • Hoya tsangii – 1988
  • Hoya tsiangiana – 1984
  • Hoya × tuafanua – 2002
  • Hoya ubudensis – 2010
  • Hoya uncinata – 1863
  • Hoya undulata – 2015
  • Hoya unica – 2013
  • Hoya unruhiana – 2013
  • Hoya uplandgrantensis – 2015
  • Hoya upoluensis – 1898
  • Hoya vacciniiflora – 1931
  • Hoya vaccinioides – 1883
  • Hoya vangviengiensis – 2012
  • Hoya vanuatensis – 2006
  • Hoya variifolia – 1926
  • Hoya velasioi – 2015
  • Hoya velasioi subsp. grandiora – 2015
  • Hoya velasioi subsp. velasioi
  • Hoya venusta – 1913
  • Hoya verticillata – 1837
  • Hoya verticillata var. citrina – 1996
  • Hoya verticillata var. hendersonii – 1996
  • Hoya verticillata var. verticillata
  • Hoya vicencioana – 2012 publ. 2013
  • Hoya vicencioana subsp. quezonensis – 2015
  • Hoya vicencioana subsp. vicencioana
  • Hoya villosa – 1912
  • Hoya vitellina – 1849
  • Hoya vitellinoides – 1950
  • Hoya vitiensis – 1915
  • Hoya wallichii – 1996
  • Hoya walliniana – 2003
  • Hoya wariana – 1913
  • Hoya wayetii – 1993
  • Hoya waymaniae – 1995
  • Hoya weebella – 2005
  • Hoya whistleri – 2002
  • Hoya wibergiae – 2001
  • Hoya wibergiae subsp. alba – 2015
  • Hoya wibergiae subsp. wibergiae
  • Hoya wightii – 1883
  • Hoya wightii subsp. palniensis – 1992
  • Hoya wightii subsp. wightii
  • Hoya williamsiana – 2013
  • Hoya wongii – 2011
  • Hoya wrayi – 1908
  • Hoya yapiana – 2010
  • Hoya yingjiangensis – 2015
  • Hoya yuennanensis – 1936

Readers Share Their Wax Plant Growing Experiences

by Alma Brand shares her experiences with Hoya carnosa.

During the summer my greenhouse is festooned with hundreds of coral star-clusters from the old-fashioned wax-plant, Hoya carnosa. During the winter its ovate, leathery leaves form an ornamental pattern against the roof-glass, providing protection for shade-loving plants on the bench below.

The rounded flower clusters hang heavily from the vines overhead and are not hidden by foliage. As many as fifty 1/2-inch star-shaped flowers make up one cluster or umbel. And on a plant exposed to the sun, as mine has been, these bouquets may be spaced less than 6 inches apart, borne along the vine on short peduncles or spurs in the axils of the leaves.

The vine, trained across a 6-foot section of the glass (there must be more than 150 feet of vine), gives the effect of a fragrant, star-studded bower. Its 10-inch pot placed on the sill leaves the bench free for other plants.

The first flowers fully open by late April. After a month or so, they darken and are pushed off the spurs by new buds forming. This cycle continues until the last flowers fall in late October.

Some like to pinch off old flower stems but should hold back with this plant. New blooms grow on the old spurs; and the older and longer the spurs, the larger the umbel of flowers will be.

For best bloom the plant should rest in winter, receiving only enough water to keep it from drying out. The plants seem to grow in any soil and will tolerate years of neglect, but a porous soil of peat moss, perlite and coarse sand, with a little charcoal, has served me well.

My Spectacular Wax Plant

By Clara Shattner

My wax plant, Hoya carnosa, was given to me as a small rooted cutting a few years ago. I had never seen a plant like it before but fortunately, I gave it the right care – a sunny window, water whenever the top soil seemed dry, and a pot trellis on which to climb.

The foliage is heavy, leaves are dark green with a few creamy white speckles. The entire plant shines and looks as fresh as though just sprinkled by a soft spring rain.

The white flowers have a delicate pink tinge and appear in umbrella like clusters. You have to touch them to see if they are real for they appear to be made of wax. In the very center of each flower is a tiny red wreath, which looks like a small crown.

When the flowers are mature, a liquid substance slowly forms in the center of each, and when it is as large as a tear it drops to the ground. This, and the fact that it blooms during the Lenten season, possibly account for one of its common names, tears of Christ.There were at least fifteen flowers on my plant just before Easter last year and their sweet scent filled the house each evening. The perfume is noticeable only at night, disappearing without a trace during the day.

There were at least fifteen flowers on my plant just before Easter last year and their sweet scent filled the house each evening. The perfume is noticeable only at night, disappearing without a trace during the day.

Cuttings are easy to start in moist peatmoss, perlite, vermiculite, or sphagnum moss. Be careful not to take too many cuttings – if you do, you’ll cut off the blooming tips and forfeit future flowers on your old plant.

Images: Top dhobern | Hoya samoensis | Hoya macgillivrayii | Hoya aldrichii | Hoya micrantha