A low growing, compact shrub to about 1 metre tall.
This cultivar was introduced by Peter Ollerenshaw of Bywong Bursery. It is a deliberate hybrid cross with one parent being a G. baueri x G. alpina cross, and the other parent G. rosmarinifolia ‘Lutea’.
It has clustered linear leaves to about 3 cm long x 0.4 cm wide, dark to mid green with a distinct raised midrib and pungent tip.
A grevillea inflorescence is technically a cluster of paired flowers, termed a conflorescence with the overall structure forming a raceme-like appearance. Grevillea species exhibit 3 main inflorescence structures:
1. A cylindrical to ovoid raceme (with flowers emerging around a 360° radius)
2. A single-sided raceme (with flowers produced on only one side, resembling a tooth-brush)
3. A condensed or clustered raceme (usually as long as it is wide, with species referred to as the spider-flowers)
Grevillea mostly produce the inflorescences at the terminals, beyond the foliage, which differs to the closely related Hakea.
This cultivar has spider inflorescences which can be slightly cylindrical, to about 3 cm long by about 3 cm wide. The inflorescences are white, red-pink and green and can have hues of red-orange as well.
Individual flowers are composed of 1 carpel (female part) where the style and stigma protrude out; 4 stamens hidden away in the perianth; and the perianth (petals and sepals collectively) which connects to a pedicel. Proteaceae flowers do not have any discernible petals or sepals (having only one whorl) and so these are referred to as “tepals” of which there are 4. In this cultivar, the carpels are to 30 mm long, red-pink with light green tips. The perianths are white-cream and can have hues of red-orange at times.
A very attractive shrub, only growing to 1 metre tall, it can be rounded and made very dense with light pruning. Useful in rockeries and in small garden beds. Can be used en masse in larger beds and as a low hedge. Grow in an open sunny to part-shade position.
Reported to be hardy once established, additional watering will promote flowering.
Very showy flowers with their white, red and green colouring.
Prune lightly to control and create density as well as to promote flowering. Can be grown on clay or sandy soil with adequate drainage.
It is frost tolerant. Good for attracting birds.
Member’s note: a member grew this plant for many years and it was a reliable long flowering small shrub. One plant was lost during one of Sydney’s prolonged dry periods as it received no additional watering. The plant was about 10 years old and was becoming ‘woody’ in the same fashion as G. rosmarinifolia. It was easily pruned when young but became less so as it aged.
Grevilleas are propagated by three principal methods; seed, cuttings and grafting. To maintain desirable characteristics of a particular plant, vegetative propagation (e.g. cuttings or grafting) must be used. This also applies to propagation of named cultivars.
Grevillea flowers were a traditional favourite among First Nations Peoples for their sweet nectar. This could be shaken onto the hand to enjoy, or into a coolamon with a little water to make a sweet drink. They might be referred to as the original “bush lollies”.
Grevillea is a diverse genus of about 365 species with about 357 occurring in Australia. Some species occur in New Caledonia, Indonesia and New Guinea. NSW currently has about 85 species although with a lot of subspecies and some informal taxa recognised.
Note: There are other cultivars also possessing ‘Jubilee’ in the name.
Grevillea – was named in honour of Charles Francis Greville (1749-1809), an 18th-century patron of botany and co-founder of the Royal Horticultural Society. He was also a British antiquarian, collector and politician who sat in the House of Commons from 1774 to 1790.
‘Hills Jubilee’ – named to mark the 25th Anniversary of Kenthurst Hills Grammar School, in the Hills District in Sydney.
Gardening with Angus – Grevillea ‘Hills Jubilee’ profile page https://www.gardeningwithangus.com.au/grevillea-hills-jubilee-grevillea/
Australian Plants Online – Grevillea ‘Hills Jubilee’ profile page https://www.australianplantsonline.com.au/grevillea-hills-jubilee.html
Australian Cultivar Registration Authority – Grevillea ‘Hills Jubilee’ profile page https://acra.biodiversity.services/info/rdetail/2170