Common name: Diels Grevillea
Origin of Scientific Name
Grevillea - after Charles Francis Greville (1749 - 1809), one of the founders of the Horticultural Society, now the Royal Horticultural Society.
dielsiana - in honour of F. Ludwig E. Diels (1874 - 1945), a distinguished German botanist who visited WA in 1900-01 and described many grevilleas.
A compact medium shrub approximately 1.5 m - 2 m in height. The branches and branchlets are angular and ridged, spreading and intertwined, with a varnished appearance. Leaves are approximately 3 cm - 8 cm in length, narrow, stiff and divided into prickly, pungent lobes. Racemes to 8 cm - 9 cm, terminal, profuse, most conspicuous and vary in colour from yellow, orange or red. Flowers are followed by 10 mm - 14 mm oblong-ellipsoidal fruit.
Found in the northern sandplain from Geraldton almost to Shark Bay and inland to Mullewa on open sandplain among low, thick scrub in yellow sand or gravelly sand over loam. Refer to the distribution map for this species via the Department of Environment and Conservation's FloraBase online herbarium.
May to September
This species is best grown from seed using the 'nicking technique' which enhances germination. Propagation can prove more difficult from cuttings and best results are achieved from firm to slightly hard new growth taken from cultivated plants in early autumn, winter or spring. It has also been successfully grafted onto G.robusta, G. rosmarinifolia and G. 'Poorinda Royal Mantle'.
G. dielsiana is grown successfully in cultivation, preferring a full sun position and will tolerate a wide range of acidic soils, including clay loam, provided drainage is unimpeded. Plants may develop a leggy habit, so need tip pruning from an early age to develop a bushy habit. Once established, plants require minimal summer watering.
G. dielsiana has much to offer as a cultivated plant. With its extremely prickly foliage it is useful for providing refuge for small birds and the brilliant display of brightly coloured flowers produced during the winter months regularly attracts nectar feeding birds. A highly recommended specimen plant for the home garden.
View in Kings Park
This species can be seen at Roe Gardens within the Western Australian Botanic Garden and in the garden bed along Wadjuk Way, opposite the main carpark.