Calla Lily Bulb Mix - 10 Pack - 10 Different Colors The cultivation of Calla usually in the autumn ball. Bed planting spacing 25cm, spacing 10cm. With fertile and slightly clayey soil, such as soil available garden 2 copies, 1 copies, chaff ash with some powder or manure; also available fine FWFPM 2, rotten leaf soil (or compost) 1, adding superphosphate and decomposed cow dung mixed soil