Clematis Asao has large and showy single and semi-double blooms (up to 20cm diameter). They are deep pink in colour, with a pale central bar on each petal and golden-yellow anthers at the centre.
Flowers appear in late spring (May-June), often with a second flush in late summer (Aug-Sept). Attractive silvery seed heads follow the flowers. The foliage has an attractive bronze sheen. Its compact habit (final height 2-3m) makes it suitable for container growing.
Asao will perform best with its roots in deep, moist soil and its head in the sun. It can tolerate any aspect but won't thrive in extremely hot and sunny conditions (for example where there is lots of reflected heat). Makes a fabulous specimen in a large container - it is relatively compact and easily shaped - or climbing up and over walls, fences and garden structures.
Aphids and caterpillars are fond of the young shoots. Follow planting instructions to minimize the risk of clematis wilt.
All clematis can be affected by Clematis slime flux, a bacterial infection of damaged tissue that can kill large specimens almost overnight. Can be pruned out if spotted early.
Asao is a Japanese variety, introduced to the UK in 1980. 'Asao' is the name of the town where this clematis was bred.
Images supplied by Clematis on the Web.