Speeding up the process

Alright so my plants are about 3-4 weeks from being done, problem is i have about 1-2 weeks at most before the weather is cold enough to kill them. What can i add or do to speed up the process to get as much bud out of it as possible? Ive already trimmed off alot of the lower branches and crappy side growth, and taken off the dyinf leaves... anything else?? They are a pure sativa strain and started flowering really late for a northern growing season.

you can put a blanket over it or bring it inside

show us some pics bro, also check my grow i have pure sativas and i hope ill make it i also planted kinda late.. r yours as far or farther than mine??

mine were about a week or so behind yours, had to pull them last night cause the temps dropped down to about -7, they seemed to have almost stopped growing because of the constant cold temps, its been around 10 Celsius here for a while and it was not helping out. Im defiantly sticking to my indica's for next years grow