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Clay soil is dense and hard to dig, but it is full of nutrients and retains water, making it a great option for native gardens. Many Australian native plants will thrive in clay soil, including eucalypt, callistemon, acacia, grevillea, and grasses. Smaller flowering plants like salvias, rudbeckia, phlox, and anemone are also well-suited to clay soil. Additionally, many favourite native plants that are naturally exposed to prolonged periods of rain followed by drought are ideal for clay soil.
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What You'll Learn
Native plants that thrive in clay soil
Clay soil is dense and hard to dig, but it is full of nutrients and retains water, making it a great option for native gardens. Here are some native plants that thrive in clay soil:
Larger Plants and Trees
- Callistemon: This plant thrives in clay soil and bursts to life with bottlebrush flowers in spring and summer. Lower-growing varieties include Little John, Rosy Morn, and Firebrand.
- Hymenosporum: Also known as native frangipani, this tall feature tree has scented golden-yellow flowers and glossy dark leaves. It is indigenous to the area and constantly self-seeds.
- Lagerstroemia: Commonly known as crepe myrtles, these trees are a great choice for gardeners looking to add flowering colour in the lilac-rose-pink-white palette.
- Grevillea: This beautiful, popular, fast-growing native shrub has finely divided silvery foliage and long-lasting flowers. It prefers dry soil, so it is ideal for areas with low rainfall.
- Eucalypt: This fast-growing native gum is drought-tolerant and seems to grow in almost any soil, from clay to sand and rocky to creeks.
- Acacia: Also known as wattle, this plant is native to Australia and grows well in clay soil.
- Grass trees: Xanthorrhoea johnsonii, or grass trees, grow well and continuously send up flower spikes. They are on a sloping area, so their drainage is excellent.
- Hakea francisiana: This tree from Western Australia has grown remarkably well in clay soil. It receives good drainage from being on a slope and is a favourite with honeyeaters.
Smaller Flowering Plants
- Salvias: This smaller flowering plant is at home in clay soil.
- Rudbeckia: This plant, also known as black-eyed Susan, thrives in clay soil.
- Phlox: This small flowering plant can grow well in clay soil.
- Anemone: This flowering plant is commonly grown in clay soil.
- Brachyscome: Also known as the cut-leaf daisy, this plant is perfect for a sunny location and features masses of flowers in spring and summer.
- Scaveola: This plant, also known as the fan flower, is perfect for a sunny location and features masses of flowers in spring and summer.
- Native violets: These plants are perfect for a shady spot and thrive in clay soil.
- Dianella: Also known as flax lily, this compact-growing native grass is suited to shady locations, perfect for borders and underplanting. They shoot up long stems of delicate starry blue flowers.
- Lomandra: This tough grass can tolerate both wet and dry conditions and full sun.
- Festuca glauca: Also known as blue fescue, this grass can tolerate both wet and dry conditions and full sun.
- Ficinia: Also called the knobby club rush, this grass can tolerate both wet and dry conditions and full sun.
Grasses
- Fountaingrass: This fast-growing ornamental grass offers fluffy, burgundy-purple flowers in bottlebrush-like spikes. It is a low-maintenance option that provides excellent texture, colour, and contrast to borders and open areas.
- Native tussock grass: This tall upright native grass is perfect for frontline coastal gardens, exposed and windy sites, and low humidity.
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$14.89
Perennial flowers for clay soil
Clay soil is full of nutrients and retains water, but its poor drainage can make gardening challenging. However, there are still plenty of gorgeous perennial flowers that can thrive in these conditions. Here are some options for perennial flowers that grow in clay soil:
Asters
Asters produce deep violet to lavender-pink blooms, adding colour and contrast to the fall perennial border front. These nectar-rich flowers are a favourite among pollinators. To control the plant's height, pinch back the stems before mid-July to delay flowering.
Baptisia
Also called blue false indigo, baptisia produces blue springtime flowers, although its colour range also includes white, yellow, and purple variants. As a native prairie plant, it has deep roots that can push through clay soil's dense texture.
Canna
Canna offers dramatic foliage and bright blooms with colourful flower spikes that sit atop stems with large paddle-shaped leaves. Some varieties grow to about 2 feet tall, while others can tower over 6 feet. This perennial grows well in poorly drained soils and can even tolerate standing water, but it requires extra maintenance to keep it healthy and tidy.
Yarrow
Yarrow is one of the best perennial flowers for clay soil and can easily thrive in hard-to-grow spaces in your garden. It is tolerant of drought and heat and is excellent for fresh-cut and dried flowers.
Coreopsis
Coreopsis is a long-blooming summer perennial flower with bright and cheery little blossoms. It makes a great companion plant to ornamental grasses and other tough annuals and perennials, especially in containers. It grows in dense, bushy clumps and has yellow, daisy-like flowers with yellow centre disks.
Daylily
Daylilies are highly adaptable perennials that are easy to grow in gardens, borders, and edging. Their trumpet-shaped blooms only last a day, but plants can remain in flower for several weeks due to their abundance of flower buds.
In addition to the above, some other perennial flowers that can grow in clay soil include fountaingrass, goldenrod, hostas, and native threadleaf bluestar. While not specifically mentioned as perennials, some Australian native plants that grow well in clay soil include Hibiscus ‘Barambah Creek’, ‘Ian’s Lemon’, and the indigenous H. heterophyllus.
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Clay soil drainage
Clay soil is a great soil to have in your garden—it's full of nutrients and retains water. However, clay soil can be problematic when it comes to drainage as it doesn't let water drain easily and becomes solid when dry.
If you have really poor drainage, it's best to try and improve this by digging to loosen the soil. You can also add grit to the base of plant holes so that plant roots don't sit in water. You can also mulch annually with composted bark, which helps to break up clay soils.
You can also add drainage where necessary by using gravel, sand, or horticultural grit to create more permanent drainage channels. French drains are another solution, which carry water to an alternate location.
If you're working with clay soil, it's best to only walk on or work with it when it's dry. If worked or walked on when wet, clay soils lose their structure and become compacted and puddled.
If you're planting shrubs and trees, plant them on slight mounds so their roots don't sit in waterlogged soil. You can also use stepping stones on lawns with heavy soil to prevent compaction.
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Improving clay soil
Clay soil is challenging for gardeners as it doesn't drain easily and becomes solid when dry. However, it is fertile and full of nutrients. To improve clay soil, you should focus on enhancing its structure and tilth. Tilth refers to the physical condition of the soil concerning ease of tillage, seedbed quality, seedling emergence, and deep root penetration. Well-drained soil has a friable consistency and good tilth.
One way to improve the structure of clay soil is by adding organic matter. This can include compost, bark, manure, leaf mould, and mulch. Organic matter improves the physical properties of the soil, increases soil tilth, and contributes to overall soil health. It forms a protective layer on the soil, slowing evaporation and reducing soil hardening. It also serves as food for earthworms, insects, bacteria, and fungi, which transform it into soil nutrients and humus.
When adding organic matter, it is best to apply two to three inches of it on the soil surface without mixing it in. This method is more effective and easier than rototilling or digging it into the soil. To achieve quicker results, work organic matter into the top few inches of the existing soil.
Another amendment that improves clay soil is gypsum, or calcium sulfate. When exposed to water, the calcium sulfate molecule dissociates, and the resulting free calcium ions attract the negatively charged clay particles, encouraging aggregation.
Additionally, when creating a new garden bed, you can use newspaper or cardboard to suppress the existing cover. Then, add a layer of thick hardwood chips on top.
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Clay soil challenges
Clay soil is often seen as a challenge by gardeners. It tends to retain water, which can make it very mucky and difficult to work with. Clay soil does not drain well, and if overwatered, it can become waterlogged, which can be fatal to plants. Clay soil also tends to have a higher pH level, which is not suitable for all plants.
The sticky nature of clay soil is due to the fine mineral particles it is composed of, which leaves little space for water to drain through. This stickiness means that clay soil can also hold onto unwanted substances, such as salts, which can be difficult to remove. Clay soil is also more prone to shifting and settling, which can cause issues for foundations and pathways.
However, clay soil is full of nutrients and can be excellent for growing certain plants. It is possible to improve clay soil by adding organic matter, such as untreated grass clippings, shredded leaves, compost, or rotted manure. This will make the soil easier to work with and improve its structure. It is best to improve the soil in an entire planting area rather than attempting to improve individual planting holes.
It is also recommended to slope the sub-base of clay soil to promote better water drainage. This will allow excess water to flow away, reducing the risk of saturation and long-term damage.
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Frequently asked questions
Clay soil is known for its dense, hard-to-dig texture and small particle size, which makes it heavy, easily compacted, and challenging to grow in.
Many Australian native plants thrive in clay soil, including eucalypt, callistemon, acacia, grevillea, and grasses. Smaller flowering plants like salvias, rudbeckia, phlox, and anemone also do well in clay soil.
Clay soil can be improved by digging in organic material such as sugar cane mulch, mushroom compost, or homemade compost. It's also important to stay off the soil as much as possible after rain and to create planting holes with sloped edges to encourage root growth into the surrounding soil.
Clay soil can be challenging because it doesn't drain easily and can bake solid when dry, leading to waterlogged roots. It is also heavy and easily compacted, making it difficult to dig. However, it is high in nutrients, and with proper soil management, a wide range of plants can be grown in clay soil.
