Clematis vitalba is a evergreen vine, great to cover pergolas. The small white flowers with neat seed heads bloom all summer long.
Hardy to Zone 3.
Sow seeds surface of lightly firmed, moist seed compost in pots or trays and cover with a very light sprinkling of compost or vermiculite. Seal container inside a polythene bag and keep at a temperature of between 59-68 degrees, or place in a cold frame or sheltered position outdoors. After sowing do not exclude light as it helps germination. Keep surface of the compost moist but not waterlogged. Germination can take 1 to 2 months and can be erratic.