Thai basil is such a valuable plant on the terrace here in Basel, I cultivate it as an annual as I don't know where to put it in the winter and it grows to this huge bush in one summer. Bees just love it! It doesn't seem to need much water and it is in full sun, but we do get rain here, so my question is, how would it do in the Med, could one cultivate it as a perennial, would it need regular watering?