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Prunus domestica 'Blue Rock' (C/D) AGM

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© RHS

Characteristics

Plant type

Fruit (edible)

Habit

Bushy

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

White in Spring

Foliage

Green in Spring and Summer

Fruit

Dark Blue in Summer

Size

Ultimate height

2.5-4 metres

Ultimate spread

2.5-4 metres

Time to ultimate height

5-10 years


Preferred common name

plum 'Blue Rock'

Family

Rosaceae


Prunus can be deciduous or evergreen trees or shrubs with showy flowers in spring, and often good autumn foliage colour. Some have edible fruit in autumn, and a few species have ornamental bark

'Blue Rock' is a well-flavoured, very juicy, moderately sweet blue plum that produces regular, good crops on a neat tree. It's not self-fertile, so requires a pollination partner. Picking season is early to mid Aug . Free stone, firm flesh. Pollination group 1 <p align="left">

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or West-facing
  • Sheltered

Cultivation

Keep a weed-free area of at least 60cm radius around trunk. Thin fruit if necessary. Irrigate in dry periods. Various training forms are possible, including fan-training

Soil

  • Well-drained or Moist but well-drained
  • Neutral
  • Loam, Sand or Clay

Propagation

Propagate by budding or grafting onto a clonal rootstock for fruit. The rootstock used will effect the size of the plant

Suggested planting locations and garden types

Wildlife Gardens, Cottage/Informal Garden or Patio/Container Plants


How to care

Pruning

Pruning plums; regular pruning according to tree form. Annual pruning required for espaliers, cordons and pruning established fans

Pests

Can get aphids, caterpillars, fruit tree red spider mite, brown scale, plum moth and bullfinches

Diseases

Susceptible to silver leaf