Rhododendron Hybrids / cultivars

Gallery name starting with: 12ABCDEFGHIJKLMNOPQRSTUVWXYZHOME to hirsutum.info

cultivar group 'Calstocker Group'

Hybridiser:Whitaker W.J., 1935 (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
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: 3
R. Calstocker Group per country:
(could be a clue for heat/cold-tolerance)

Canada : 2
United States : 1

R. calophytum var calophytum   Click to see more information

X'Doctor Stocker'   Click to see more information

R. caucasicum   Click to see more information

xR. griffithianum   Click to see more information

cultivar group 'Calstocker Group' photos

Photo byRobert George
Locationprivate garden Sammamish, WA, USA
Date05 May, 2010
See high-resolution picture
Photo byJack Morgan
Locationgarden of Mrs. Watson, Kirkland, USA
Date14 April, 2009
See high-resolution picture

Send your own information or pictures

Parentage according the IRRC of the Royal Horticultural Society
Involved in other cultivars:Hybridiser
'Regality''Calstocker Group' x 'Irene Stead'O'Rourke, H., 1989
'Sister Betty''Calstocker Group' x 'Gill's Crimson'Weeks, C., 1995
'Striking''Calstocker Group' x 'Auguste van Geert'O'Rourke, H., 1989
Rhododendron cultivars   Hirsutum.info     Project started 03 June 2009