Because it has a very short shelf life and is not easy to figure out when is ripe. It just pass from green to gray-green, then it develops ugly black spots and

Because it has a very short shelf life and is not easy to figure out when is ripe. It just pass from green to gray-green, then it develops ugly black spots and soon after that starts getting bitter, and is too late. Still waiting for my lazy trees to do anything. I culture four varieties and they are notoriously unable to pollinate themselves without a second tree of other variety close. Last time it was... almost, but slugs.