Grevillea johnsonii

RHS Plant Profile

Johnson's spider flower

Conservatory Greenhouse Shrubs

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An evergreen shrub to about 2.5m with leaves deeply lobed into narrow, needle-like leaflets. Terminal clusters of pink and red flowers appear in summer

Position

Full sun

Soil Types

Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 10–20 years
Max Spread: 1.5-2.5 metres
Max Height: 1.5-2.5 metres

Growing Conditions

Loam Sand

Moisture: Well–drained
pH: Acid or Neutral

Position

Full sun

Aspect: West–facing or South–facing
Exposure: Sheltered
Hardiness

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 (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H3

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Proteaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
Potentially harmful: Skin irritant/allergen. Wear gloves and other protective equipment when handling Pets: Skin irritant/allergen. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Grevillea can be evergreen shrubs or trees, with alternate, simple or pinnately divided leaves and petal-less flowers consisting of a colourful calyx tube with protruding style, borne in racemes or panicles
Name Status: Correct
Plant Range: E Australia

How to Grow

Cultivation

Grow outdoors in very mild areas in acid to neutral, well-drained soil. Grow under glass in lime-free compost with added grit in full light and apply low phosphate, liquid fertiliser monthly when in growth

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

Coastal
City and courtyard gardens
Mediterranean climate plants
Wall side borders
Flower borders and beds

Pruning

Pruning group 1 outdoors, but more rigorous pruning may be necessary indoors to restrict size

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus (rarely)