Question
My lilies have grown beautifully but the petals are now all green instead of white and purple.  I've also noticed that inside one of the lily is compacted with something green it looks a bit weird, do you know whats going on?

Answer
Hi Mary,
Thanx for your question about Zantedeschia aethiopica.

The spathe (the white hood of the flower) turns green after flowering and covers the ripening berries (most likely, the compacted green structure to which you refer...). It rots away when the berries are ripe and the succulent yellow berries attract birds, which are responsible for seed dispersal.

I hope this helps.
Tom