Evaluation of the Winter-hardy Yucca taxa among extreme conditions in landscape applications

摘要

The Agavaceae are mostly adapted to arid conditions; the majority are xeromorphic and succulent rosette plants of desertic regions. In Hungary, the limiting factor of application of Yucca taxa is not the hot summer but the humid and cold weather in winter. Despite of the fact that more than the half of the 59 recognised taxa is winter-hardy, in the practice of the planting design and horticulture in Hungary the number of the applied taxa is only 3 or 4. Our evaluation is based on the observing of bedded-out plants to rock gardens in four locations: one garden is in the Zoological and Botanical Garden of Budapest, two places are in private collections (érd, Budakeszi) and the last one is in the Botanical Garden of ELTE. In all of these collections there were planted selected species that – according to the references – survive the temperature -10 °C.