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  Section: Principles of Horticulture » Plant propagation
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Plant propagation
  Seed propagation
  Sowing and aftercare in protected environments
  Sowing in the open
  Vegetative propagation
  Characteristics of propagation from vegetative parts
  Natural vegetative propagation
  Artificial methods of propagation
  Budding and grafting
  Tissue culture

Rhizomes such as border irises can be divided as other herbaceous perennials. Again this becomes necessary to get rid of the developing bare patch where the rhizomes grow away from their starting point. Normally about 10 cm of non-woody rhizome is cut off with each fan of leaves. The leaves are reduced to a third to reduce water loss and wind rocking. Some species, such as Bergenia, are flowering in the early spring so it is best to lift the plants in mid-winter and remove the rhizomes. These should be washed and the dormant buds found. Sections with a bud can be taken off and rooted in potting compost in trays by burying them horizontally to half their depth. It is advantageous to provide ‘bottom heat’ by standing the trays on soil warming cables. The plants are not ready to go out until the fibrous roots have emerged from the bottom of the tray and have been ‘hardened off’.


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