About 5 years ago I bought 3 Zantedeschia - Yes I was feeding them, a couple of times a year then a member of the Gardeners Question Time team told me they may be in soil too rich! so I stopped. They are were outside but I have dug them up and am waiting
By Middlechris
United Kingdom 
About 5 years ago I bought 3 Zantedeschia (Calla) Lillies. The first year they thrived. Since then I haven't had a single bloom. They have multiplied and multiplied and I have now got them in three separate terracotta pots, every year they produce masses of beautiful folliage but not one bloom. Help!
3 Nov, 2010
Answers
I change the soil each year for mine, I let them dry out in greenhouse then re-pot with fresh compost in the spring, works each time.
4 Nov, 2010
Sorry to question you like this, but what variety of Zantedeschia are they? If you don't know, do they have spotted leaves? And you are 100% certain they're Zantedeschia I suppose?
4 Nov, 2010
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Can I ask if you feed them, and if so, what with and how often? And are these inside the house or outside in the garden?
3 Nov, 2010