this particular sativa is still in a vegetative state for the first 5-6 weeks of it's flowering cycle, I'm just about to take some clones from it actually. there are a few things about sativas that go against traditional thinking, cloning from the plant at week 4-5 in flower is just one of them. Indoors they only need to be about 6" tall when flowered to end up with a 4-5ft plant, so they require very little veg time. I've had some sativas that grow slow in veg, but once flipped to flower you need to get the weed wacker out as they can grow 2-3" in a day everyday for 3 weeks or longer. Look at the tops on the sativa and you'll see what I mean. I think this plant needs a little more nitrogen but you can control the stretch somewhat by backing off on the nutes when the plant starts pulling hard. Sativas are light feeders even considering the massive stretch some of them go through. Sativas can get reallly bitchy when they get too many ferts. less is more with a sativa IMO, slow and low like good BBQ.
You'll want to time the flowering periods outdoors. I believe the sativa should finish sometime in November. Ok, so this is a cross I made of Island Sweet Skunk and Bhodi Satva. 90% sativa, about an 85-95 day flowering time indoors. this is the first outdoor run of this strain.
EDIT: I forgot I have a friend in costa rica I gave some seeds to who harvests this strain perpetually. They hit 12ft and are still growing.
For sativas in a greenhouse I would stage the greenhouse cycle so one set of plants is finishing up in mid-late september and another set mid october to early november. november is really starting to push it in a CO greenhouse, you'll need a heater but hey that's what a propane co2 generator is for.
A sativa that finishes indoor in 80-90 days should work well. Sensi's NL#5 X Haze is right there and is a bitchen greenhouse/indoor strain. I would pick something with at least 10% indica or a faster sativa to run in a CO greenhouse. Nothing over 95 day flowering or it probably won't make it. I'm making some 50/50 crosses myself that usually take around 80 days. if you wanna try something unique let me know and I'll kick you a few beans from one of my pollen chucking experiments.
This is my first sativa run in a greenhouse in CO so we'll see what happens with this one so I can better gauge what strain to run next year.
There's alot of grapefruit, hashplant, and afghani for the indicas in my greenhouse. Most 100%-80% indica finishes outdoor mid august to late sept. I like the landrace indicas from the hindu kush region myself, good breeders and good stand alone performers.
I'll take more pics for you ace, the center of the greenhouse is 11'. I built this greenhouse with tall sativa dominant plants in mind.