This collection was founded in 1955 as a propagation unit on small scale. According to estimates rebuilding the old landscape rock garden (situated at the Rocky Pond) would have been too expensive, therefore a new rockery was built in 1973 planted with the rock plants of Europe. The perennial beds near the greenhouses improved gradually to their present size, our latest addition was a Hosta bed (with 180 species and hybrids) still under construction. Reshaping and planting of these beds will take place in the close future in harmony with the new greenhouses.
It includes 2800 species and varieties. Apart from the rock-dwelling flora, several steppe, sylvatic, rare alpine and tiny bulbous flowers are also found in this collection. The following plant families represent themselves with a large number of taxa: the Lily (Liliaceae), the Iris (Iridaceae), the Saxifraga (Saxifragaceae), the Stonecrop (Crassulaceae), the Buttercup (Ranunculaceae), the Cabbage (Cruciferae), the Bellflower (Campanulaceae), the Sunflower (Compositae) and the Primrose (Primulaceae) families. More than 150 cultivars of tall bearded irises (Iris barbata elatior), 100 hybrids of new york asters (Aster novi-belgii) and 200 hosta species and cultivars enrich this collection.
This collection shows its best in the peak blooming season from April to June and in early October with splendid colours of new york asters.