Abstract
Single-node cuttings of stem tissue, green stolons and etiolated rhizomes were used to propagate several Mentha species ( M. piperita L., M. spicata Hunds., M. rotundifolia L. and M. rotundifolia var. variegata) under controlled conditions. Rooting percentage was maximal for etiolated rhizomes and decreased in order for green stolons, sprouted mid-stem, basal and apical cuttings. Rooting of stem tissue was dramatically increased for all species by pre-treatment of cuttings with indole-3-butyric acid and α-naphthylacetic acid. No significant differences were observed between the different Mentha species with regard to rooting percentage, length of resulting roots or fresh weight of developing tissue. However, both root length and fresh weight were also highly dependent on the type of cutting, with etiolated rhizomes providing maximum values and the lower values of stem cuttings decreasing in the order: sprouted mid-stem → basal → apical.
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