The chemical composition of eleven mint species, grown in Piedmont (North West Italy) in 1985 and 1986 were studied in relation to environmental factors. Thermoperiod and rainfall were measured and correlated with qualitative and quantitative oil composition changes. Temperature and rainfall changes were found to affect the oil composition of some of them, particularly peppermint. The degree of adaptation and some genetic considerations were also discussed.
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Massimo E. Maffei (1988) studied this question.
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