Asessing cold tolerance of E. leucoxylon 'Rosea'
GIT Forestry Consulting - Consultoría y Servicios de Ingeniería Agroforestal - www.git-forestry.com - EUCALYPTOLOGICS
(Photo courtesy Matt Smith)
Red or pink flowers are not too common, but some Eucalyptus do have them. A classical example is Corymbia ficifolia, the Red-Flowering Gum. A striking small tree which flowers profusely. But for those trying to add them to garden designs in cool temperate climates of a maritime type, there are other options with a lightly higher tolerance to cold.
(Click image to enlarge)
Inevitably, this map is not a detailed one and is based on just one of the main parameters with importance for plant acclimation, which is extreme minimum temperatures reached for a certain area along a period of time. If we start removing from the coloured areas all the unsuitable microclimates (too windy, too salty, too exposed, too boggy, too chilly even if just once per winter, too shady, etc) the suitable real area for cultivation would reduce considerably. Still, it can be an indication for those willing to add red coloured blooming eucalypts to their gardens.
Our own trials with this type of eucalypt in the tablelands of Galicia (Atlantic maritime climate with a tendence to harsh frost events), where oceanic influence fades, do suggest that Eucalyptus leucoxylon 'Rosea' reaches its cold hardiness limits around -7ºC. This would be roughly equivalent to suitability for safe cultivation in the mildest part of Atl1 Zone, or in USDA Zone 9a and less harsh areas. Our results in the Iberian Peninsula do corroborate earlier trials done by Dr. David Robinson at Earlscliffe Gardens near Dublin, the Northernmost known latitude at which this and several other rare species have bloomed.
If you get to know of any case of successful horticultural use of this pink flowering Eucalyptus at higher latitudes than Dublin, please do not hesitate contacting us!
Northernmost Flowering Eucalyptus, and now it is time for the Northernmost Red Flowering one!. And for the matter, you are also welecome to contact us if you see and photograph them growing and blooming elsewhere. The most specimens tracked down, the better future recommendations for growers worldwide!
© 2008 Gustavo Iglesias Trabado. Please contact us if you want to use all or part of this text and photography elsewhere. We like to share, but we do not like rudeness.