Rhododendron stenopetalum 'SCHÖNBRUNN'

Rhododendron stenopetalum is a rare evergreen to semi-deciduous azalea with thin flower petals and leaves thanks to which it is called spider azalea. It is native to Japanese islands Honshu and Shikoku. In horticultural world only one variety was known - Linearifolium. Its sport was found in the gardens of Schönbrunn Castle in Wien, Austria, and was named after the castle.

Schönbrunn is a unique and beautiful semi-deciduous azalea. The flower petals are extremely narrow just like its linear, ribbon-like leaves. They are mid green, matte, and remain evergreen through mild winters. After cold winters they dry out and are replaced with new foliage after flowering. Annual growth is only about 15-20 cm and the shrub exhibits a low, spreading habit. Thanks to delicate flowers and fine foliage it looks fluffy and exotic. Blooming begins in late April and continues until mid May, however, in semi-shaded location the flowering period may double.

Semi-deciduous azaleas are ericaceous plants which, just like their Japanese sisters, prefer semi-shaded position sheltered from the hottest midday sun, and constantly moist soil. During temporary summer dry spells in certain areas their leaves may suffer and be prone to fungus infections. When spots appear on the leaves or they lose colour and start to curl use a suitable fungicide immediately. 1-2 sprays should help the plant remain beautiful and healthy. They require no pruning. Should you need to shape or rejuvenate your plant do so as early in the spring as possible so that it can still make new twigs with flower buds for the next season. It re-sprouts reliably. It has many surface roots which spread to sides in search for nutrients and water. The best soil mixture consists of peat, lime-free compost and leaf-mould. This azalea has not been tested in all possible conditions but so far has proved hardy to -24°C (USDA zone 6).

Last update 02-04-2019