Common name: Blue Spirea
Caryopteris is a half hardy to hardy deciduous shrub that grows to around 1.2m (4ft) high with a similar spread.
In colder areas of the UK, plant out against a house wall to offer some protection.
The grey green leaves are aromatic, and clusters of blue bell like flowers appear from August to September.
Caryopteris - Dark Knight
Pot up rooted cuttings into 70mm (3") pots of potting compost.
Grow them on in a cold frame until planting out time.
Cut out previous year’s growth hard back to young healthy buds.
Weak or damaged stems should be cut out to ground level.
Take semi hardwood cuttings and place them in a cold frame to root.
Plant out any time from now until March in a sunny spot with well drained soil.
In exposed conditions it may require some form of protection during the winter months, against a south facing wall or fence would be ideal.