The present invention relates to plant expressing transgenes and to plants transformed to comprise additional copies of genes, said genes encoding at least a HMGR-CoA reductase and a terpene synthase. The invention further claims methods for preparing the plants, and a method for producing terpenes. The present thus provides a reliable and cost effective platform for generating any terpene, in particular any mono- and/or sesquiterpene of interest. For example, the skilled person may use any gene encoding a sesquiterpene synthase for accumulating the respective sesquiterpene in the plant of the present invention.