Details
 
 
 
Sorbus 'Joseph Rock' is an upright tree with pinnate leaves which turn orange, red and purple in autumn, contrasting with the butter-yellow berries
 
 
 
Hardiness
 
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
 
H6 - Hardy in all of UK and northern Europe (-20 to -15)
 
 
 
Sunlight
 
Full sun, Partial shade
 
Aspect
 
North-facing, East-facing, South-facing, West-facing
 
Exposure
 
Sheltered or Exposed
 
 
 
Moisture
 
Well-drained, Moist but well-drained
 
 
 
Soil
 
Clay, Sand, Loam
 
 
 
pH
 
Acid or Neutral
 
 
 
Size
 
Ultimate height
 
8-12 metres
 
Ultimate spread
 
4-8 metres
 
Time to ultimate height
 
20-50 years
 
 
 
How to grow
 
Cultivation
 
Grow in moderately fertile, humus-rich soil. Tolerant of atmospheric pollution; ideal specimen tree in small garden
 
 
 
Propagation
 
Propagate by softwood cuttings in early summer, chip budding in summer or grafting in winter
 
 
 
 
 
How to care
 
Pruning
 
Pruning group 1. No routine pruning necessary. Remove diseased, damaged, congested or crossing shoots. Shoots that are growing in unwanted directions can also be pruned out in Late winter or early spring.
 
 
 
Pests
 
May be attacked by aphids, blister mites and sawflies
 
 
 
Diseases
 
May be affected by apple canker, honey fungus and fireblight
 
 
 
Info. courtesy of the RHS