Rhododendron Hybrids / cultivars

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Rhododendron 'Gloxineum'

Hybridiser:Dexter, C.O.. Sandwich, MA, USA, 1940 (see more plants of this hybridizer)
Status:IRRC registered.
Synonyms:'Dexter's Gloxineum'
The figures listed here are averages.

The exact location (altitude, sunlight, soil, climate) can influence growth considerably
in 10 years
150 cm. (5ft.)
Bloom time:late midseasonFlower:unknown
Bloom time duration:16
Bloom time duration 'Gloxineum'

Observation based on 3 plants,
growing in 1 'My-gardens'.

Exact= 16 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: 4
R. Gloxineum per country:
(could be a clue for heat/cold-tolerance)

Canada : 3
United States : 1

R. fortunei ssp fortunei   Click to see more information


Rhododendron 'Gloxineum' photos

Photo byPeter Norris
LocationPrivate garden on Marthas Vineyard, MA USA z7
Date03 June, 2013
See high-resolution picture
Photo byDavid C. Royster
LocationRockville MD, USA
Date14 May, 2006
See high-resolution picture

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Rhododendron cultivars   Hirsutum.info     Project started 03 June 2009