Ruqayyah Snyder
Milk thistle, or Silybum marianum, is a biennial herb that grows to heights of 1-1.5 metres and bears purple florets in spring and summer. Native to southern Europe and the Mediterranean, it has been introduced to other parts of the world, including Australia. In Australia, milk thistle is considered a weed in some regions and a declared pest in Western Australia due to its potential to contaminate crops and wool and provide cover for rabbits. However, it is also cultivated and sold as seeds, and its leaves and florets can be cooked and eaten.
| Characteristics | Values |
|---|---|
| Scientific name | Silybum marianum |
| Common names | Milk thistle, variegated thistle, blessed milk thistle |
| Origin | Native to southern Europe and the Mediterranean |
| Growth | Biennial herb growing from 1-1.5 metres tall |
| Flowers | Purple florets in spring/summer |
| Leaves | Dark green with white veins and patches |
| Uses | Seeds used for their hepatoprotective properties, leaves can be eaten cooked |
| Regions in Australia | New South Wales, Victoria, South Australia, Queensland, Tasmania, Western Australia |
| Legal status | Declared pest in Western Australia, controlled as a weed in certain parts of Australia |
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What You'll Learn
Milk thistle is a declared pest in Western Australia
Milk thistle, or Silybum marianum, is a declared pest in Western Australia. This biennial herb, bearing purple florets, is native to southern Europe and the Mediterranean. It was likely introduced to Australia as a medicinal plant or a contaminant of grain. Milk thistle is a weed of crops, pastures, roadsides, and disturbed areas. It is also regarded as an environmental weed in New South Wales and Victoria.
The Western Australian government has recognised milk thistle as a pest due to its invasive nature and potential harm to animals. The plant has numerous spines, which may injure animals, including domestic dogs. It is also an important contaminant of wool, and provides cover for rabbits. As a large plant, milk thistle can cover an area of over one metre in diameter, and it reproduces only from seed. The plant forms a broad rosette of shiny dark green leaves variegated by a network of white veins and patches. The leaves are deeply lobed, with a long spine at the point of each lobe.
In spring, a branched flowering stem, without prickles, grows up to two metres high. Milk thistle usually flowers annually but can occasionally take two years to bloom. It is most common in the coastal and sub-coastal regions of New South Wales and southern Victoria, and is relatively common in south-eastern South Australia, south-eastern Queensland, Tasmania, and south-western Western Australia.
Landowners and occupiers in Western Australia must adhere to specific requirements and control methods to manage milk thistle as a declared pest. These measures aim to prevent the spread and minimise the impact of this invasive species.
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It is an environmental weed in New South Wales and Victoria
Milk thistle (Silybum marianum), a tall plant with large purple flowers, is native to Europe. It was likely introduced to Australia as a medicinal plant or a contaminant of grain. Milk thistle is an environmental weed in New South Wales and Victoria, where it is a weed of crops, pastures, roadsides, and disturbed areas. It is most common in the coastal and sub-coastal regions of these states and is also relatively common in other parts of Australia, including south-eastern South Australia, south-eastern Queensland, Tasmania, and south-western Western Australia.
In New South Wales and Victoria, milk thistle is regarded as an environmental weed of some importance. In Victoria, it is declared under legislation as a Class C7 weed, which means that all reasonable steps must be taken to control the weed and prevent its spread in certain regions. This includes areas such as Glenelg, Corangamite, Port Phillip East, Goulburn, North East, West Gippsland, and East Gippsland.
Milk thistle is a short-lived herbaceous plant, usually growing between 90 and 180 cm tall but occasionally reaching up to 3 meters. It forms a large basal rosette of leaves during its early stages of growth. The plant reproduces only from seed, and a large plant can cover an area of over one meter in diameter. In spring, a branched flowering stem grows up to two meters high.
Due to its invasive nature and potential impact on the environment, it is important to be aware of the local laws and restrictions regarding milk thistle in Australia before planting or allowing it to spread.
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Milk thistle is a biennial herb that grows up to 1.5 metres tall
Milk thistle (Silybum marianum) is a biennial herb that grows up to 1.5 metres tall. It is native to southern Europe and the Mediterranean but has been introduced to other parts of the world, including Australia. In Australia, milk thistle is considered a weed in some regions, particularly in crops, pastures, roadsides, and disturbed areas. It is most common in the coastal and sub-coastal regions of New South Wales and southern Victoria but can also be found in other states.
Milk thistle is a tall plant with large purple flowers. It typically grows from 1 to 1.5 metres tall, but some sources mention heights of up to 3 metres. It forms a large basal rosette of leaves during its early stages of growth. The leaves are dark green, variegated with a network of white veins and patches, and deeply lobed with a long spine at the point of each lobe. In spring, a branched flowering stem grows, bearing purple florets. The seeds of the milk thistle plant contain a mixture of flavanolignans called silymarin, which have various medicinal properties.
The growth of milk thistle may need to be controlled in certain parts of Australia, as it is considered a weed. In Victoria, for example, there are regulations in place to control the weed and prevent its spread in certain regions. Similarly, in South Australia, it is declared as an agricultural weed and must be controlled in specific parts of the state. Milk thistle is also a declared pest in Western Australia due to its potential to contaminate wool and provide cover for rabbits.
When growing milk thistle, it is essential to check local laws and regulations, as restrictions may apply in certain areas. Milk thistle seeds should be sown in rich, well-drained soil in a sunny location during spring or summer. Frequent fertilisation during the warmer months is recommended. The florets can be collected as they dry but before they split and release seeds with attached "wings" for dispersal.
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It bears purple florets in spring and summer
Milk thistle, or Silybum marianum, is a biennial herb that grows between 1 and 1.5 metres tall. It bears purple florets in spring and summer and is native to Southern Europe and the Mediterranean. In Australia, milk thistle is considered a weed in some states and territories, including New South Wales, Victoria, South Australia, and Western Australia. It is also present in Queensland, Tasmania, and Norfolk Island.
Milk thistle is a short-lived, upright plant with a large basal rosette of leaves during its early growth stages. It typically grows between 90 and 180 cm tall but can occasionally reach up to 3 metres in height. The leaves can be cooked and eaten like spinach, while the young florets can be prepared like artichokes.
The purple florets of milk thistle are not just aesthetically pleasing but also signify the plant's reproductive stage. These florets, when dried, release seeds with attached 'wings' that aid in dispersal. This natural dispersal mechanism contributes to the plant's ability to spread and establish itself in new areas, potentially becoming invasive.
In Australia, milk thistle is recognised as an environmental weed, particularly in New South Wales and Victoria. It is a weed of crops, pastures, roadsides, and disturbed areas. The plant's ability to spread and its invasive nature have led to its declaration as a pest in Western Australia, where it is a contaminant of wool and provides cover for rabbits.
The vibrant purple florets of milk thistle are a distinctive feature of this plant, adding a touch of colour to the landscapes where it grows. While milk thistle may have some ecological benefits, its classification as a weed and pest in certain regions of Australia highlights the importance of managing its growth and dispersal to maintain ecological balance.
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It is native to southern Europe and the Mediterranean
Milk thistle, or Silybum marianum, is a species of thistle native to southern Europe and the Mediterranean. It has been introduced outside its natural range and is now found in North America, South America, Africa, Australia, Asia, and other parts of the world. In Australia, it is regarded as an environmental weed in some states and is a declared pest in Western Australia (WA).
Milk thistle is an upright biennial herb that can grow to be between 1 and 3 metres tall, with an overall conical shape. It has red to purple flowers and shiny pale green leaves with white veins. The leaves can be eaten cooked as a type of spinach, while the young florets can be eaten like artichokes. The seeds contain a mixture of flavanolignans, collectively known as silymarin, which is used for its hepatoprotective (liver-protecting) properties.
Milk thistle is mainly cultivated as a medicinal plant, but it is also sometimes used as a food source. It has been used in traditional medicine for centuries, particularly for liver disorders and to increase breast milk production. However, there is currently no clinical evidence to support its medicinal effects. It is also promoted as a dietary supplement for diabetes, liver disorders, and other conditions, but there is conflicting evidence regarding its effectiveness.
Milk thistle is an adaptive crop with low requirements. It has low soil nutrient requirements and is drought-resistant, making it well-suited to sunny, warm ruderal meadows and regularly disturbed places. It establishes itself in warm, sunny locations such as rubble deposits, the foot of south-exposed walls, urban fallow land, and cattle pastures. However, it does not prefer dry, stony soils.
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Frequently asked questions
Milk thistle is commonly found in the coastal and sub-coastal regions of New South Wales and southern Victoria. It is also present in South Australia, Queensland, Tasmania, Western Australia, Lord Howe Island, and Norfolk Island.
Yes, milk thistle is considered a weed in Australia, particularly in New South Wales and Victoria. It is also a declared pest in Western Australia.
Milk thistle is a tall plant, typically growing between 1 to 1.5 meters tall, but it can occasionally reach up to 3 meters. It has purple flowers and variegated leaves with a network of white veins and patches.
Milk thistle has been traditionally used for treating liver disorders and increasing breast milk production. It is also promoted as a dietary supplement for liver disorders, diabetes, and other conditions.
Milk thistle is generally well-tolerated, but it may cause digestive issues such as bloating, nausea, and gas. It may also cause allergic reactions, especially for individuals allergic to plants like ragweed, chrysanthemum, marigold, and daisy. The quality of milk thistle supplements has been questioned, with some products containing different amounts of active compounds or being contaminated.
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