Posted: 20/03/2017 at 21:36
I think you have a straight answer in what Ladybird said earlier. The flowers have male and female parts and don't need another different plant to pollinate them.
The variegated versions are the same plant except for leaf colour which doesn't affect flower and fruit. If this plant needed something else to pollinate them the variegated ones wouldn't do. But it doesn't. Bees transfer the pollen from the male bits to the female bits
They are edible in that they are not poisonous but in the UK they are unlikely to ripen.