Eupatorium cannabinum is tall stately plant with masses of white-pink flowers, an excellent butterfly plant attracting large numbers in late summer. Flowers: July-Sept. Requires: Damp Height: 60-120cm. Useful medicinal. Laxative, diuretic, blood purifier. Used externally for sores and ulcers.
Sow indoors or in a cold frame in spring. Surface sow onto moist, well-drained seed compost. Lightly press the seeds into the soil. Just cover with a sprinkling of soil. Light is needed for germination. Ideal temp. 20°C. Germination takes approx. 4 weeks. If germination does not occur cold stratify. Place the pot inside a polythene bag and move to the fridge, 4°C. for 4 weeks then return to warmth. Transplant seedlings when large enough to handle to 8cm pots and grow on. Plant out in summer after the danger of frost has passed. Can be sown directly.