Cirsium also known as the Scotch thistle can reach a metre in height.
Cirsium Growing and Care Guide
Common Names: Plume Thistle. Thistle: Pasture; Spear; Scotch; Clustered; Ashland; Slough; Peregrine; Field; Meadow; Fountain; Summer; Swamp. Life Cycle: Hardy perennial, or biennial that is usually grown as a hardy annual by gardeners. Height: 30 to 80 inches (50 to 200 cm). Native: Asia, Europe, North Africa, North America.
Growing Region: Zones 3 to 10. Flowers: Summer and early autumn. Flower Details: Purple, pink, yellow, cream, white. Feathered hairs. Foliage: Prickly leaves, deeply lobed.
Sow Outdoors: 1/8 inch (3mm). Following last frost or autumn. Spacing 12 to 24 inches (30 to 60 cm). Sow Indoors: Germination time: two to three weeks. Temperature 70°F (21°C). Two weeks before expected last frost. Transplant outdoors following the last frost.
Requirements: Full sunlight or light shade. Good drainage. Moist soil. Family: Asteraceae / Compositae Miscellaneous: Some species have culinary use.
How to grow Scotch thistle - Cirsium
The seeds of scotch thistles can be sown in either autumn or after the last frost of spring. They should be sown at a depth of 3 mm (1/8th inch).
If started to be grown indoors first, then Cirsium takes about two to three weeks to germinate at a temperature of 21 to 24 degrees Centigrade (70 to 75°F).
The seedlings should be planted out in early spring, when it is still possible to get a frost with a spacing of about 60 cm (2 feet).
They can grow in either partly shaded or sunny parts of the garden that has good drainage.