Abstract
Abstract The numbers of flowering stems of Phormium tenax in and near Wellington City fluctuated up to 75-fold between good and bad years. P. tenax flowered prolifically over most of central New Zealand in the summers of 1978/79, 1981/82, and 1985/86 but produced few flowers in the summers of 1976/77, 1979/80, and 1982/83. P. cookianum flowering fluctuated 10-fold between good and bad years. Poor and heavy flowering years for P. tenax and P. cookianum coincided but P. cookianum produced additional flowering peaks in 1977/78 and 1980/81. Light, moderate, and heavy summer flowering of P. tenax was inversely correlated with wet weather the previous February (r = -0.789) and high absolute air temperatures during the previous April to June (r = 0.969). The spectacular flowering of P. tenax in the summer of 1981/82 was probably induced by exceptionally high air temperatures on 9 May 1981. Phormium tenax in Wellington flowered synchronously with alpine tussock (Chionochloa) in Nelson and some Nothofagus species....
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