This paper presents a discussion of the constraints imposed on lexicalisation during production by language-specific patterns, such as whether words exist in a language to describe a given event and whether language-specific syntactic and phonological information correlates with semantic properties. First, we introduce in broad strokes relevant architectural assumptions concerning the levels of representation consulted in lexicalising concepts and we discuss how cross-linguistic research can inform both architectural and processing assumptions. We then assess whether information at one level can affect processing at other levels. In particular we address issues of separability and information flow between lexico-semantic information, on one hand, and conceptual, syntactic, and phonological information on the other hand. Our aim is not to provide a new theory of lexicalisation and lexical retrieval in production, but to discuss the consequences of language-specific effects on lexicalisation for the architecture of the production system, the processes engaged during word-learning, and the information flow during production. (Contains 3 figures, 1 table and 4 footnotes.)