Rhododendron Hybrids / cultivars

Gallery name starting with: 12ABCDEFGHIJKLMNOPQRSTUVWXYZHOME to hirsutum.info

cultivar group 'May Day Group'

Hybridiser:Williams, A.M., 1932 (see more plants of this hybridizer)
Status:IRRC registered.
Height
Height
The figures listed here are averages.

The exact location (altitude, sunlight, soil, climate) can influence growth considerably
in 10 years
?
Bloom time:unknownFlower:unknown
Type:elepidoteLeaves:unknown
Hardiness:
H0 = 0 °C (32 F)
H1 = -7 °C (20 F)
H2 = -12 °C (10 F)
H3 = -15 °C (5 F)
H4 = -18 °C (0 F)
H5 = -24 °C (-10 F)

Registered
In 'Your Garden' you can administrate
your rhododendrons.

To try/see this go 'Home' (top-right).
on hirstum.info: 1
R. May Day Group per country:
(could be a clue for heat/cold-tolerance)

Netherlands : 1


Seed-parentPollen-parent
R. haematodes ssp haematodes   Click to see more information

XR. griersonianum   Click to see more information



cultivar group 'May Day Group' photos





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Parentage according the IRRC of the Royal Horticultural Society
Involved in other cultivars:Hybridiser
'Billy Budd'   Click to see more information


  Billy Budd
'May Day Group' x R. elliottiiHanger, F.E.W., 1947
'Charmaine''Charm Group' x 'May Day Group'Aberconway, Lord, 1936
'Charmaine Group''Charm Group' x 'May Day Group'Aberconway, Lord, 1936
'Dainty''May Day Group' x 'Elizabeth Group'Aberconway, Lord, 1938
'Dainty Group''May Day Group' x 'Elizabeth Group'Aberconway, Lord, 1938
'Egbert van Alstyne''May Day Group' x R. haematodes ssp haematodesSeabrook, Cecil S., 1965
'Elisabeth Inglis-Jones'R. griersonianum x 'May Day Group'Horlick, Sir James, 1941
'Fabia Group x May Day Group''Fabia Group' x 'May Day Group'No hybridiser registered
'Hydon Harrier''May Day Group' x 'Jervis Bay'George A.F., 1974
'J'aime''Jaipur Group' x 'May Day Group'Brandt, Lester E., 1963
'Little Joe'   Click to see more information


  Little Joe
R. forrestii Repens Group x 'May Day Group'Brandt, Lester E., 1945
'May Morn''May Day Group' x R. beanianumAberconway, Lord, 1935
'Oberbürgermeister Janssen'   Click to see more information


  Oberbürgermeister Janssen
'May Day Group' x 'Goldsworth Orange'Bruns, J Nursery, 1952
'Quinella''Britannia' x 'May Day Group'Henny, Rudolph, 1958
'Redwax'R. haematodes ssp haematodes x 'May Day Group'Henny, Rudolph, 1957
'Relaxation''May Day Group' x R. degronianum ssp yakushimanum 'Koichiro Wada'Smith, C.C. (Cecil), 1966
'Robert Louis Stevenson''May Day Group' x 'Jester'Seabrook, Cecil S., 1967
'Rosalinde''May Day Group' x 'Goldsworth Orange'Bruns, W., 1952
'Sabine''Goldsworth Orange' x 'May Day Group'Bruns, J Nursery, 1952
'Steven Foster''May Day Group' x R. haematodes ssp haematodesSeabrook, Cecil S., 1964
'Voodoo''Britannia' x 'May Day Group'Henny, Rudolph, 1945
'Wilgen's Ruby x May Day Group''Wilgen's Ruby' x 'May Day Group'No hybridiser registered
'Yakday'R. degronianum ssp yakushimanum x 'May Day Group'New Zealand, 1972
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Rhododendron cultivars   Hirsutum.info     Project started 03 June 2009