Drawing on data from eleven preschools in four European countries (Germany, Belgium, Sweden, and the UK), this edited volume explores the progress of preschool children learning English over a period of two years. In the first volume, children's lexical and grammatical comprehension, the quality of L2 input, the effect of immersion on L1 development, comparisons with English monolingual children, as well as intercultural learning are addressed. In addition, environmental learning in an immersion context, labelled 'green immersion', is outlined with reference to a bilingual preschool located within a zoological garden.