Bitter Orange Trees. Care? Uses? Grafting?
I have just rented a house on a Greek Island and there are 12 Bitter Orange trees in the garden. I can't communicate with the owner very well, but I gather he got them by mistake, he wanted sweet oranges...
a) I don't want to kill his trees - they are fairly well established, about 4-inch thich trunks - we are in full drought here for a good 5 months in the summer. How often do I need to water them to keep them alive, and how often for a good crop. What fertilizer to they need? can I grow nitrogen fixing plants around the base? Will they need pruning?
b) Is the juice drinkable, I read it was a bit like grapefruit juice - I am not much of a jam maker, any other ideas?
c) The owner mentioned that one could graft sweet oranges and lemons onto some of the trees, is this difficult? Again I don't want to kill his origional trees, but it seems daft to have all those trees and still not have a lemon for my G&T!
Thanks for any advice that you can give a Black-Thumb, with a big garden to care-take!