Banksia helianthi syn Dryandra quercifolia - Oak Leaved Banksia - 10 seeds
Banksia helianthi syn Dryandra quercifolia is one of the most attractive species in the genus.
It is a spreading shrub to about 2m tall and with a similar spread, the leaves are stiff and about 100mm long with toothed margins, the new growth is a bronze colour and adds to the attraction of the plant.
The bright yellow flower clusters may be up to 80mm in diameter and occur at the ends of the branches in spring, the dark brown bracts which occur at the base of the flowerheads give them a very attractive appearance. Pink flowered forms are also known and are in cultivation.
This species has proven itself to be reliable in inland areas in well drained, sandy soils but cannot be regarded as suitable for areas of humid Summer conditions. The large flower clusters are very popular as cut flowers and the species is being farmed for the cut flower trade.
Propagation is relatively easy from seed which germinates well by conventional sowing methods in an ordinary seed raising mix. Early Spring is the best sowing time for areas which experience cold, wet Winters, otherwise in the early Autumn.
Pre-germination of seed by sowing into a closed container containing moist vermiculite or a similar material and storing indoors in a warm shady area is also a useful method of germination, particularly when outdoor temperatures may be unsuitable. Germination usually occurs in 2-3 weeks using this method and when the root has reached about a centimetre or so in length, the seedling can be placed into a small pot of seed raising mix.
In cultivation all species perform best in well drained soils and generally resent continually wet soils. They are suitable for shallow soils over a hard claypan, shallow clay soils can present problems but if garden beds are built up to 300 - 600mm, greater success is experienced.
Banksia and Dryandra species are generally at their best in open, sunny positions although the plants will tolerate some shade with reduced flowering, the prime requirement for them to grow well in cultivation is a freely drained topsoil.
Like most members of the Proteaceae family, they can be adversely affected by fertilisers, particularly those with phosphorus - it is generally recommended that they be fertilised only with low phosphorous, slow release fertilisers or not be fertilised at all.
Care is easy as they are hardy and will stand a lot of neglect once established. They can be pruned to shape where necessary.
10 premium quality seeds shipped on receipt of cleared funds.