Cirsium rivulare 'Trevor's Blue Wonder'
Plume Thistle, Brook Thistle
Color: Light purple
Bloom Time: Late spring and early summer
Cirsium rivulare 'Trevor's Blue Wonder' is a perennial plant with upright, leafy stems that grow up to 4 feet (1.2 m) tall. It is not truly blue. In fact, it has light purple flowers during late spring and early summer. This clump-forming thistle-like perennial has divided, spineless foliage which forms rosettes at the base of the upright stems.
USDA hardiness zone 5a to 9b: from −20 °F (−28.9 °C) to 25 °F (−3.9 °C).
How to Grow and Care
The seeds of Cirsium can be sown in either autumn or after the last frost of spring. They should be sown at a depth of 0.12 inches (3 mm). If grown indoors first, then Cirsium takes about 2 to 3 weeks to germinate at a temperature of 70 to 75 degrees Fahrenheit (21 to 24 degrees Celsius). The seedlings should be planted out in early spring when it is still possible to get a frost with a spacing of about 2 feet (60 cm).
Cirisium thrives in full sun and poor, average, or reach soil that is moist but well-drained. Plants require little care, but deadheading limits their tendency to self-sow. They generally self-sow only in moderation, and unlike weedy thistles, the seedlings are easy to pull up. Use Thistles in mixed beds, herb gardens, or meadow-like plantings. See more at How to Grow and Care for Thistles (Cirsium).
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