Back to Fact Sheet Contents Page Facts Sheet 20
Australian Plants for Clay Soils
Many gardeners regard clay soils with disdain, believing that nothing will grow in them. However, although they can be difficult to work with, clay soils are usually quite rich in nutrients and can sustain good plant growth.
You need to understand how to work with clay soils, and choosing the correct time is the key.
Preparing clay soils
Adding gypsum to clay soil
Adding organic material
Adding generous amounts of organic material to the soil will improve the workability of ALL soils.
When selecting organic material, remember, if
it has once lived,
Plants that will grow in clay soils
Astartea fascicularis 1 x 1.5m. Small leaves, white or pink flowers throughout the year.
Banksia ericifolia 5 x 4m. Rounded dense shrub, long cylindrical orange flowers during autumn and winter.
Banksia ‘Giant Candles’ is a cross between B.ericifolia and B.spinulosa. The orange flower spikes can be up to 40 cm. long.
Banksia spinulosa 1.5 x 1.5m. Cylindrical orange-yellow flower spikes during autumn and winter. Bird attracting.
Banksia robur 2 x 2m. Large tough leaves with serrated margins, flower spike is blue-green in bud and yellow–green when in flower.
Banksia marginata 4-6 x 2-4m. Dark green leaves with a silver underside. Yellow flower spikes during spring and summer.
Bauera rubioides 1 x 1m. Rosy pink flowers for most of the year with a main flush in spring. White flowered forms are available.
Boronia denticulata 1 x 0.6m. Aromatic foliage, star pink flowers in spring.
Brachyscome multifida 0.5 x 1.5m. Small blue or white flowers throughout the year. Soft divided leaves.
Calytrix tetragona 1 x 1m. Bright green foliage. White through to deep pink star
shaped flowers in spring followed by reddish fruiting capsules.
Correa alba 1 x 1.5m. Oval greyish leaves. Open star shaped flowers in winter with some flowering throughout the year. Suitable as a front line coastal plant.
Correa ‘Dusky Bells’ 0.5 x 2.5m. Showy pink bell shaped flowers in autumn.
Correa ‘Mannii’ 0.5 x 1.5m. Dusty pink flowers in autumn and winter . Dense growth habit.
Correa reflexa 1-2 x 1-2.5m. Many forms available. Green through to red bell shaped flowers during autumn and winter.
Crowea exalata 0.8 x 0.8m. Aromatic foliage. Pink or white star like flowers in summer and autumn.
Dianella revoluta Flax-like leaves. Bright blue flowers in spring followed by deep blue globular fruit.
Eremophila maculata ‘Aurea’ 1.5 x 1.5m. Suitable for hot dry position. Yellow tubular flowers for most of the year .
Grevillea x gaudichaudii 0.3 x 3m. Vigorous groundcover with oak shaped leaves. Tooth-brush like deep red flowers in winter and spring .
Grevillea ‘Honey Gem’ 4 x 4m. Large shrub with orange toothbrush like flowers for most of the year. Bird attracting.
Grevillea ‘Moonlight’ 4 x 3m. Large shrub. Attractive cream toothbrush-like flowers.
Grevillea ‘Poorinda Royal Mantle’ 0.3 x 3m. Vigorous groundcover. Dark red flowers in spring and summer. One of the best ground cover grevilleas.
Hardenbergia violacea Trailing plant 1 to 3m. Can be used as a climber to cover fences etc. Purple, pink or white pea–shaped flowers in spring.
Hibbertia scandens Quick growing twining plant. Large yellow open flowers in spring.
Melaleuca hypericifolia 2 x 4m. Dense shrub. Brick red bottlebrush flowers in late spring and summer.
Melaleuca thymifolia 0.6 x 0.6m. Small shrub with elliptical leaves. Mauve or white flowers for much of the year.
Micromyrtus ciliata 1 x 1m. Very tiny green leaves. In spring the plant is covered in small white flowers. Suitable for cut flowers.
Myoporum parvifolium x 1.5m. Dense ground covering plant. Green or purple leaf forms, with white or pink flowers are available.
Prostanthera rotundifolia 1.5 x 1.5m. Roundish leaves often with toothed margins. Masses of purple flowers in spring. A pink flowering form is available.
Scaevola ‘Mauve Clusters’ Prostrate x 1.5m. Quick growing ground cover.
Westringia fruticosa 2.5 x 2.5m. Blue-green foliage. White flowers throughout the year. A hardy front line coastal plant.
Xerochrysum bracteatum syn. Helichrysum bracteatum ‘Dargon Hill Monarch’ 0.6 x 0.6m. Large grey-green leaves. Large flower heads in spring, summer and autumn. Bright yellow through to white everlasting flowers.
Produced by the Australian Plants
Society, Central Coast Group in conjunction with Gosford
City Council and Wyong Shire Council.