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===Propagation===
===Propagation===
*''Division'' - Divide clumps every two years as growth starts in the spring. Select strong crowns from around the outside of the existing clump and discard the weak central section.
*''Seed'' - Sow either in spring or autumn in a cold frame.
*''Cuttings'' - Take 2 inch long softwood cuttings in spring, use a sandy compost mix, and place in a cold frame to root.
===Pests and diseases===
===Pests and diseases===
