Dear Roland and Alberto, If I planted Saffron 15 cm deep in my heavy clay I doubt that I’d ever see them again. This or 30 cm (!!) might work in sand, small gravel or loose loam, but not in my heavy clay. Jim W. On Nov 29, 2013, at 4:58 PM, Bulborum Botanicum <bulborum@gmail.com> wrote: > I plant them 18cm deep James Waddick 8871 NW Brostrom Rd Kansas City, MO 64152-2711 USA Phone 816-746-1949