whats the earliest ?

hey guys i live in australia and was just wondering what the earliest time i can start planting my 2nd grow in sydney n.s.w. cheers for the info in advance

can any 1 tell me ? coz coz i roughly planted my last season in august but both plants plowered late and wernt ready and the cold started killing them so i had to chop them down and smoke them early although im not implying that thats what was the cause of why they didnt finish because it was my first grow and i did make a few mistakes like all newbies do.so i just wanna know if i was planting at the right time or to late.cheers for and info in advance