You're welcome,
pollen travels on a breeze and can easily journey 10 feet. You need to identify and destroy the males before they release the pollen(kinda feels like having to feed puppies to a lion. Not that i have fed puppies to a lion but that's how i imagine it would feel). That's the beauty of small containers, portability. You can move them anywhere. Another thing you're up on a terrace with probably brick all around you, stone, stucco etc. Your plants are probably in a pretty good place. You can't just take them inside overnight? Marijuana is very hardy and can survive light frosts with no problem. Although I think it helps if it experiences cold in the spring which will not be the case here. If it's cool to just have that plant sitting out there I wouldn't add any covering until you need it for protection. Watch the weather and look out for those temps that go below 40. a plant can survive below that but 40 is an almost magical number for growth in the plant world. Very few plants if any do much below 40. Your whole terrace area probably lets off heat at night btw.