Index

R. 'Honingen'

Rhododendron Hybrid

R. williamsianum X R. oreodoxa var oreodoxa

Hybridized By: Hobbie, Dietrich G.. Westerstede/Linswege, Germany, 1965

R. 'Honiton'

Rhododendron Hybrid

? X ?

Hybridized By: Waterer, H. (Knaphill). Woking, Surrey (Knaphill), UK

R. 'Honky Tonk'

Rhododendron Hybrid

? X ?

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA

R. 'Honneur de Flandre'

Azalea Hybrid

? X ?

Hybridized By: Sunningdale Nursery, 1855

R. 'Honsu’s Baby'

Rhododendron Hybrid

R. keiskei var ozawae 'Yaku Fairy' X R. scabrifolium var spiciferum

Hybridized By: Spady, H.A.. Honsuchachac Rhododendron Garden, Salem, Oregon, USA, 1978

R. 'Hoo Loo'

Vireya Hybrid

? X ?

Hybridized By: Unknown

R. hooglandii

Species

Subgenus: Rhododendron
Section: Vireya
Subsection: Euvireya

R. hookeri

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Thomsonia

R. 'Hoopla'

Rhododendron Hybrid

R. catawbiense 'Catalgla' X R. 'haematodes x decorum'

Hybridized By: Mehlquist, G.A.L. Storrs, Connecticut, USA, 1965

R. 'Hoosier Charm'

Azalea Hybrid

R. 'Purple Splendor' X R. 'Vuyk's Scarlet'

Hybridized By: Schroeder, H.R., 1973

R. 'Hope Findlay'

Rhododendron Hybrid

R. 'Loderi Group x Earl of Athlone' X R. 'Creeping Jenny'

Hybridized By: Crown Estate Commissioners. Windsor, Berkshire, England, 1974

R. 'Hoppy'

Rhododendron Hybrid

R. degronianum ssp yakushimanum X R. 'Doncaster'

Hybridized By: Waterer (Bagshot). Surrey, England, 1970

R. horaeum

Species

Subgenus: Hymenanthes
Section: Pontica
Subsection: Neriiflora

R. 'Horizon Dawn'

Rhododendron Hybrid

? X ?

Hybridized By: Brockenbrough, E.C. Bellevue, Washington, USA, 1978

R. 'Horizon Fiesta'

Rhododendron Hybrid

R. 'Hotei x Koichiro Wada' X R. 'Whopper x Lem's Cameo'

Hybridized By: Brockenbrough, E.C. Bellevue, Washington, USA

R. 'Horizon Garnet'

Rhododendron Hybrid

X

Hybridized By: Brockenbrough, E.C. Bellevue, Washington, USA, 1974

R. 'Horizon Lakeside'

Rhododendron Hybrid

R. 'Nancy Evans x Lem's Cameo' X R. 'Skipper'

Hybridized By: Brockenbrough, E.C. Bellevue, Washington, USA, 1982

R. 'Horizon Monarch'

Rhododendron Hybrid

R. 'Nancy Evans' X R. 'Point Defiance'

Hybridized By: Brockenbrough, E.C. Bellevue, Washington, USA, 1981

R. 'Horizon Snowbird'

Rhododendron Hybrid

R. 'Britannia x yakushimanum' X R. 'Mrs Lindsay Smith x yakushimanum'

Hybridized By: Brockenbrough, E.C. Bellevue, Washington, USA, 1975

R. horlickianum

Species

Subgenus: Rhododendron
Section: Rhododendron
Subsection: Maddenia

R. 'Horsham'

Rhododendron Hybrid

R. 'Ferdinand Massange de Louvrex' X R. 'Queen Wilhelmina'

Hybridized By: van Nes C. B . & Sons. Boskoop, Netherlands, 1922

R. 'Hortulanus H. Witte'

Azalea Hybrid

R. molle ssp molle X R. molle ssp japonicum

Hybridized By: Koster M. & Sons | Boskoop | Netherlands, 1892

R. 'Hoshi'

Azalea Hybrid

? X ?

Hybridized By: Japan | no hybridiser registration, 1987

R. 'Hot Dawn'

Rhododendron Hybrid

R. 'Mars' X R. 'yakushimanum x Mars'

Hybridized By: Brueckner, J.B.. Mississauga, Ontario, Canada, 1975

R. 'Hot Mix'

Rhododendron Hybrid

? X ?

Hybridized By: Smith, A.W.. Niagara Falls, Ontario, Canada

R. 'Hot Pink'

Rhododendron Hybrid

? X ?

Hybridized By: Smith, A.W.. Niagara Falls, Ontario, Canada

R. 'Hot Shot Variegated'

Azalea Hybrid

? X ?

Hybridized By: Siskiyou Rare Plant Nursery, 2000

R. 'Hot Spot'

Rhododendron Hybrid

R. 'Nova Zembla X ( ( La Bar's White X ( fortunei X wardii )' X R. 'Mary Belle'

Hybridized By: Looye, Jack. Niagara on the Lake, Ontario, Canada

R. 'Hot Target'

Rhododendron Hybrid

? X ?

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA

R. 'Hot Ticket'

Rhododendron Hybrid

? X ?

Hybridized By: Whitman, M.J.. Wall, NJ, USA

R. 'Hot Times'

Azalea Hybrid

? X ?

Hybridized By: Carlson's Gardens | (Bob & Janice Carlson), South Salem, New York | USA, 1992

R. 'Hot Topic'

Rhododendron Hybrid

X

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1999

R. 'Hot Topper'

Rhododendron Hybrid

? X ?

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA

R. 'Hot Tropic'

Vireya Hybrid

? X ?

Hybridized By: Unknown

R. 'Hot Vibes'

Azalea Hybrid

? X ?

Hybridized By: Carlson's Gardens | (Bob & Janice Carlson), South Salem, New York | USA

R. 'Hot Wonder'

Rhododendron Hybrid

? X ?

Hybridized By: Langdon, G.

R. 'Hot Ziggerty'

Rhododendron Hybrid

? X ?

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA

R. 'Hot Ziggety'

Rhododendron Hybrid

? X ?

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA

R. 'Hotei'

Rhododendron Hybrid

R. 'Goldsworth Orange' X R. 'souliei x wardii var wardii'

Hybridized By: Sifferman, Karl I.. Seattle, Washington, USA, 1968

R. 'Hotei x horaeum'

Rhododendron Hybrid

R. 'Hotei' X R. horaeum

Hybridized By: Birck, Jens. Kastrup, Denmark

R. 'Hotei x Koichiro Wada'

Rhododendron Hybrid

R. 'Hotei' X R. degronianum ssp yakushimanum 'Koichiro Wada'

Hybridized By: Unknown

R. 'Hotline Beauty'

Rhododendron Hybrid

R. 'Kettledrum x Jock X Mrs Chatles S. Sargent' X R. 'griersonianum x Romany Chal Group'

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA, 1980

R. 'Hotrodder'

Rhododendron Hybrid

? X ?

Hybridized By: Delp Weldon E.. Harrisville, Pensylvania, USA

R. 'Hotspur'

Azalea Hybrid

? X ?

Hybridized By: Rothschild, L. de | Founder of Exbury Gardens | UK, 1934

R. 'Hotspur Group'

Azalea Hybrid

? X ?

Hybridized By: Rothschild, L. de | Founder of Exbury Gardens | UK, 1934

R. 'Hotspur Orange'

Azalea Hybrid

? X ?

Hybridized By: Rothschild, L. de | Founder of Exbury Gardens | UK, 1958

R. 'Hotspur Red'

Azalea Hybrid

? X ?

Hybridized By: Rothschild, L. de | Founder of Exbury Gardens | UK, 1958

R. 'How-raku'

Azalea Hybrid

? X ?

Hybridized By: Chugai Nursery Co. | Kobe-city, Hyogo | Japan, 1938

R. 'Howard Anderson'

Azalea Hybrid

? X ?

Hybridized By: Gable, J.B. | Stewartstown, Pennsylvania | USA

R. 'Howard Hughes'

Rhododendron Hybrid

? X ?

Hybridized By: No hybridiser registered

R. 'Howard Kline'

Rhododendron Hybrid

? X ?

Hybridized By: MacMullan, D. (Dennis). Hamburg, Pennsylvania, USA