The doctor I used to work for had a potted one in his office that seemed to weep and always had sticky stuff on its stems, but mine never did that. I thought that maybe it was just a different type of plant than mine. If you took cuttings from his, they wept too once repotted.
I've never heard of Calla Lillies crying but maybe it has something to do with them being a a popular flower for a wedding bouquet and tears of emotion spring from many when seeing the bride walk down the isle ??? Just a guess ;-)
The only other thing I can think is that I've noticed my Calla Lillies drop little drops of pollen and maybe those are considered 'tears' ...
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