I have no experience growing yacon. However, I will summarize what is written about it in the book Perrennial Vegetables by Eric Toensmeier.
Yacon is distantly related to the sunflower. It is clump forming and can grow to 6 feet. It is not frost tolerant but can be grown as an annual through most of the US and parts of Canada. It takes 6 - 7 months to grow the tubers. It can be grow in full sun or part shade. Stem cuttings, small tubers, and clump division can be used for propagation. Tubers can be eaten raw, baked, or used in recipes that include tubers. Stems and young leaves can be eaten. After flowering, the tops should die back. This is the time to harvest the tubers.