Bull Thistle (Cirsium vulgare) Seeds (100)Sale

Germination: Bull thistle seed viability is generally high, and may vary between 60 and 90% .

Germination of bull thistle seeds typically occurs in spring or fall in response to adequate soil moisture. Bull thistle seed germination is less sensitive to low water potential than that of several other thistle species.. This evidence supports the idea that bull thistle seeds may acquire an induced dormancy through exposure to cycles of wetting and drying such as can be experienced in the uppermost layers of soil.

Bull thistle seeds germinate well over a wide range of temperatures. Germination of bull thistle seeds is reduced if the temperature is outside the range of 50 to 86 degrees Fahrenheit. Fresh seeds have higher optimum temperature for germination than stored seeds.

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Bull thistle is found on dry and wet soils, but is most common on soils with intermediate moisture.

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Bull thistle is found as far north as 67′ 50′ N latitude in Scandinavia. In shade, bull thistle is restricted to south-facing slopes. In dry habitats such as coastal dunes it is confined to north-facing slopes. It has been suggested that bull thistle plants are not very invasive in the southern part of its North American range.