In my country this plant is called Tiny Boxwood! What's its real name? and how much light and water does it need? Many Thanks
Thanks! Yes, it is a box, most likely European Box Buxus sempervirens (the commonest species in the nursery trade), but if it is locally collected in Iran, it could be Caspian Box Buxus hyrcana, which is very closely related (many botanists treat it as a synonym of B. sempervirens). It will tolerate a fair amount of shade; you should be able to grow it outdoors in Tehran easily, all it will need is a little extra water in dry periods.
I have put it in balcony, where it gets indirect sun-light, and i water it every other day. but it's loosing all leaves! :( what should i do?
Stop watering perhaps? They're fairly drought tolerant, so unless it's got mites or something it should recover. Water only when the soil is dry one inch down as measured by a finger inserted in the pot.