Cirsium rivulare 'Trevor's Felley Find' - 2 litre pot Cirsium rivulare Trevor's Felley Find - 2 litre pot Cirsium rivulare Trevor's Felley Find - 2 litre pot £7.00 Quantity: at £7.00 each Purple-blue thistle flowers in spring and summer, held above silvery-green leaves. Not spiny or invasive. Sun, humus-rich soil. H: 1mSimilar to Cirsium rivulare 'Atropurpureum', but with slightly more purple in the flower colour. Formerly known as Cirsium rivulare Trevor's Blue Wonder.