Stevens continued to win prestigious awards for her cultivars, including the British Iris Society's Foster Memorial Plaque (1953) and the American Iris Society’s hybridisers’ medal (1955). Between 1949 and 1961 her cultivars won two awards of merit and six honourable mentions in American iris competitions. She was guest speaker at the American society’s annual convention in 1956—the first woman to be so honored—and was appointed an honorary judge in 1962. Early in 1967 Stevens was elected an associate of honour of the Royal New Zealand Institute of Horticulture.