Hi Mickey,

I've grown lots of white calla lilies (Zantedeschia albomaculata) from seed several different seasons. I haven't tried wintersowing them but I think it would work ok because I've had them selfsow before. One large seed head fell on the ground and laid there all winter and then little baby callas came sprouting up the next summer. They take a long time to germinate and need lots of warmth so don't expect anything to happen until summer. The seeds will form tiny (nonblooming) bulbs the first year. These bulbs cannot freeze so you will need to either dig and store them indoors every winter or give them a very thick muclch to keep the soil and bulb from freezing. I don't really think there is any advantage to wintersowing callas because they need so much heat to germinate. You might as well just wait to sow them until April or May.