how long can you grow weed?

i have a plant around 4 months
and he has been in fowering for like 5 days

is this alright and plus
i have a plant same age but not even hafe the height of the other

This nice thing about these plants is that they are photoperiod controlled. You can veg for as long as you like it is really up to you. Once the plant has show maturity it can be flowered, and some people have had the same "mother" plant for years.

thats really helpful thanks man
hey what strains do you think are good?
im thinking of buying some seeds
and what site should i get them from?

and another thing when my lights turn off
i mean the temp just drops down to like 20 degrees
what should i do?

get a heating pad or sum'n.,.,or a small space heater and direct it toward tha gro space