Rhododendron Hybrids / cultivars

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Rhododendron 'Holden'

Hybridiser:Shammarello, A.M. Euclid, Ohio, USA, 1958 (see more plants of this hybridizer)
Status:IRRC registered.
The figures listed here are averages.

The exact location (altitude, sunlight, soil, climate) can influence growth considerably
in 10 years
Bloom time:unknownFlower:unknown
Bloom time duration:18
Bloom time duration 'Holden'

Observation based on 1 plants,
growing in 1 'My-gardens'.

Exact= 18 days.
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)

In 'Your Garden' you can administrate
your rhododendrons.

To try/see this go 'Home' (top-right).
on hirstum.info: 13
R. Holden per country:
(could be a clue for heat/cold-tolerance)

United States : 7
Canada : 6

'Cunningham's White'   Click to see more information

R. caucasicum   Click to see more information

xR. ponticum   Click to see more information

Rhododendron 'Holden' photos

Photo byPaul & Linda Lawry
Locationprivate garden Lantzville, Vancouver Island, BC, Canada
See high-resolution picture
Photo byRobert Day
Locationprivate garden Kalamazoo, MI, USA
Date03 May, 2010
See high-resolution picture
Photo byJeannie & Calvin Parsons
Locationprivate garden, Victoria, BC, Canada
DateMay, 2009
See high-resolution picture
Photo byJack & Jackie Looye
LocationRhodo Land Nursery, Ontario, Canada

Send your own information or pictures

Parentage according the IRRC of the Royal Horticultural Society
Involved in other cultivars:Hybridiser
'All Stars''Holden' x 'Skookum'Whitman, M.J., 1996
'Baby Doll'R. degronianum ssp yakushimanum x 'Holden'Lancaster, Ben, F., 1966
'Nancy Carol''Holden' x 'Bob Peters Special'Carter, R., 1976
'Off-shoot'   Click to see more information

'Holden' x 'Mary Garrison'Rhein, W.L., 1977
'Spiked Punch''Holden' x 'Shaazam'Whitman, M.J., 1996
Rhododendron cultivars   Hirsutum.info     Project started 03 June 2009