Linnaea borealis – Twinflower Linnaea borealis – Twinflower October 11, 2015 Bosky Description: mat-forming, evergreen perennial. Slender stems hold pairs of rosy, trumpet-shaped flowers (summer) 3 to 4″ above the foliage. Mulch soil with leaf mold to encourage twinflowers spread. Part sun, regular water, well-drained soil. 0