Mahonia Japonica


SKU: mahonia-japonica Category:
Common Name: Oregon Grape
Size: 2-3 LITRE
Hardiness: H5
Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees ˚C) are shown in brackets

  • H1a: under glass all year (>15˚C)
  • H1b: can be grown outside in the summer (10 - 15 ˚C)
  • H1c: can be grown outside in the summer (5 - 10 ˚C)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5 ˚C)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1 ˚C)
  • H4: hardy through most of the UK (-10 to -5 ˚C)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10 ˚C)
  • H6: hardy in all of UK and northern Europe (-20 to -15 ˚C)
  • H7: hardy in the severest European continental climates (< -20 ˚C)
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This plant has won a RHS award

2-3 Litre Pot

  • RHS Award of Garden Merit
  • Position: Full shade, partial shade
  • Soil: Moist, well drained
  • Growth Rate: Slow
  • Flowering Period: November – March
  • Hardiness: H5
  • Eventual Height: 1 – 1.5m
  • Eventual Spread: 1.5 – 2.5m

Mahonia Japonica, also known as ‘Oregon Grape’, a recipient of the much coveted RHS Award of Garden Merit is a bushy, upright growing evergreen shrub.  Its pinnate leaves emerge almost horizontally from the stem and consist of many tiny leaflets.  During the Winter months these tend to turn reddish-purple in colour when the long stalked bright yellow flowers are formed.  These are followed by many shiny blue-black berries.   It is an excellent pollinator attracting butterflies, bees and other beneficial insects to the garden.   A wonderful Winter flowering plant for the garden which can also be used to provide an ideal screen to help deter any unwanted intruders to the garden.

Looking After Your Mahonia Japonica

Generally pest and disease free, although may be affected by rust, powdery mildew (easily treated) an easy to grow evergreen Winter flowering shrub. A low maintenance plant which can benefit from a sunny or partially shaded area in all types of garden.  The Mahonia Japonica will tolerate most soils which can be moist but are well drained, the use of a well rotted garden compost around it’s base will help protect the roots from both the heat in Summer and the cold in Winter.  Very little pruning is necessary, although any required to removed damaged or unwanted branches to maintain shape or prevent overcrowding should be done mid-Spring.

Additional information


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