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Significant occurrences of phenotypic variation have been noted in micropropagated  Rhododendron.  Studies were undertaken to determine what aspects of micropropagation lead to variation.  Rhododendron  `Molly Fordham' was used to evaluate growth parameters and the incidence of variation in plants that originated from 3 month and 54 month old cultures. Plants from 3-month-old cultures were significantly wider than plants from 54-month-old cultures.  Rhododendron  `Aglo', `Molly Fordham', and `Scintillation' were used to evaluate growth and the incidence of variation in plants grown from microcutting bases and rerooted microcutting tips (retips). Three-month-old retips were significantly taller and wider than bases of the same age, but possessed fewer branches. The influence of in vitro N 6 -[2-isopentenyl]adenine (2-iP) concentration on the growth and phenotype of regenerated plants of `Aglo', `Molly Fordham', and `Scintillation' was examined. Data taken 3 months post-acclimation indicate that growth and the incidence of variation in response to 2-iP concentration is cultivar dependent.

INFLUENCE OF CULTURE AGE, CYTOKININ LEVEL IN CULTURE, AND “RETIPPING” ON GROWTH AND THE INCIDENCE OF VARIATION IN TISSUE-CULTURED RHODODENDRONS