Eucalyptus
Of the 25 hardy species, the toughest have a -20C rating in our information tables. Besides the ubiquitous semi-hardy E. gunni there are plants just as beautiful and even hardier. The available species are from Dutch seeds (from trees which do well here) or from places in the Snowy Mountains in Australia where they resist extreme frosts. Be aware of the fact that Eucalyptus grows too quickly in rich soil so you should grow it in rather poor soil. It needs full sun. All varieties are evergreen (or rather, bluey-green). On poorly drained soil only E. gunni, E. crenulata, E. rodwayi and E. stellulata can survive, but their hardiness will be less under such conditions. The finest trees grow on poor, sandy soil. Plant as a young seedling and do not transplant later anymore. Planting bigger trees may result in topping over at a later age due to a poor root development, unless they grow in airpots. The range of different Species has expanded significantly in 2008, as Eucalyptusnursery "Koala" guarantees a continuous supply. In the extreme winter 2009/2010 many Eucalypts froze back, and have been partly replaced by hardier varieties