Abstract
The effect of plant density (10 cm, 20 cm and 30 cm × 50 cm) on the plant growth, herbage yield, essential oil production and composition of Hungarian type peppermint (Mentha piperita L. var. sylvestris Sole) was studied in field experiments in Ruukki, Northern Finland (64°40′N and 25°05′E) in two two-year experiments. In the first growing season, herbage yields were the highest and leaf/stem ratios the lowest in 10-cm density, but there were no systematic significant differences between different densities. Oil yields per hectare were the highest in 10- and 30-cm densities. The oil concentration was highest in the highest plant density but the oil composition was not affected by it.
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