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Long John grevillea is a tall upright growing evergreen shrub with an with a soft and billowy appearance. Mature plants become quite large and can reach heights of 10-15 ft. and spread 10-15 ft. across. Foliage consists of finely divided dark green leaves that are soft and pliable. Large numbers of showy light pink and red flowers occur in mid to late spring. This is a fast growing cultivar that needs space to mature and works well for screening and in mixed tree and shrub plantings. It is cold hardy to 20°F and adapts to all parts of the Inland Empire.

Water Needs

Long John grevillea grows best in sunny garden locations on well drained soils and with low amounts of supplemental water during summer. The chart shown below provides a recommended baseline guide to the monthly irrigation schedule and volume of supplemental water needed to maintain healthy growth throughout the average year. It should be noted there are several months indicated by an asterisk (*) when winter rains can provide sufficient moisture and irrigation is not needed. The high and low range of moisture indicates it can grow with varying amounts of water; more moisture during spring helps achieve a more robust and longer flowering cycle.

Irrigation Schedule and Graph

Low Water Use Plants

Irrigation Schedule 2

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
Runs per Month 0x to 2x 0x to 2x 0x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 0x to 2x 0x to 2x
Inches per Run 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1"
Inches per Month 0" to 2" 0" to 2" 0" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 0" to 2" 0" to 2"

Range of supplemental summer water: 7"-14"
Range of supplemental winter water: 0"-10"

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
For more information on how to use this Irrigation Schedule and Graph, follow this link.

For information how to calculate your irrigation system’s schedule and precipitation rate, please follow this link.

Plant Properties

Plant Type: Shrub
Foliage Character: Evergreen
Habit: Upright, Open, Mounding, Low-branching, Graceful
Growth Rate: Fast
Height: 10 ft. - 15 ft.
Width: 10 ft. - 15 ft.
Water Needs: Low 2
Foliage Color: Dark green
Flower Color: Red, Pink
Flower Season: Spring
Soil Adaptations: Well-draining soil
Exposure Adaptations: Heat, Drought, All day sun
Function: Wildlife value, Screening, Residential spaces, Parks and open space, Hummingbird plant, Foliage accent plant, Flowering accent plant, Commercial spaces, Banks, Background plant


May benefit from light pruning when young to establish an evenly balanced and dense branch pattern (D). Lightly prune after flowering to encourage a bushy growth habit (9).



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