Ask John Negus
Q Please could you tell me what this shrub is and how we can propagate it? Sandra Jones, via email
A This shrub is California allspice (Calycanthus occidentalis). A native of California, it grows to around 10ft (3m) and pleases us with its aromatic dark or red flowers.
I am pleased that yours is flourishing. It is not commonly seen and it makes a garden special.
Most plant centres stock it. The best way is to take half-ripe cuttings in early August. Start by tugging side shoots from the main stem, complete with a heel of bark. Then shorten cuttings to 3in (8cm). Additionally, reduce the heel of bark to 1/4in (6mm) from the base of the cutting.
Remove lower leaves that might be buried and insert cuttings to half their depth and 3in (8cm) apart around the edge of a 4in (10cm) pot filled with proprietary cutting compost.
Water them in and cover the pot with an inflated clear plastic bag. Position the cuttings on a warm but not too sunny windowsill. Roots and new growth should form
