Where are we and where to go? This volume brings together many contributions and aspects of functional-structural plant modelling. These last pages draw attention to three significant questions that may emerge while reading this book: (i) to what extent do these models address plant functions? (ii) what is the (future) role of these models in plant sciences? and (iii) how can the use of these models be enhanced? These questions will be discussed in this epilogue. Are current functional-structural plant models really functional?