By Seed

• Perennials may take years to flower when grown from seed. The Virginia Cooperative Extension warns that perennials may not grow true to type from saved seed.
  
  

Taking Cuttings

• Vegetative propagation can be accomplished by division of established plants or taking cuttings. Cuttings may be gathered from stems or roots. The Virginia Cooperative Extension warns that root cuttings should be taken after the plant's blooming period and that root cuttings are more difficult to propagate.
  
  

Division

• The Mississippi State University Extension recommends dividing plants during their dormant season, working with spring blooming plants in the fall and fall blooming plants in the spring. Plants generally should be divided every three years or when the plant's growth or appearance is adversely affected.