Indica v. Sativa

[Aroww]

Okay so I'm almost postive that after everything that I've read that I have at least one nearly pure indica and the other two are growing completely different. I thought, at first, that the one plant was going to be the opposite sex than the others or vise versa. I've never grown before so I didn't know. But now that they are all budding, I know they're all girls. The indica has a bunch of small buds and the sativas are long big buds. And they're TALL!
My indica has already been harvested but it appears that my sativas won't be ready for quite some time. they have long big buds, but ALL white hairs. there is no rust yet like there was with the others. Do I harvest any way? Should I wait? Is this a good thing? Are they that different of species' type? I don't know, someone can you help me out?

 

[Mutt]

Indicas take 7-10 weeks of flower to finish. Some sats take up to 14 weeks to finish.
Trichome viewing with magnifying apparatus is the only way IMO to tell when to harvest.

 

[sweetnug]

It is imperative that you let that sativa go until the trichomes are 60% amber, get a 60X microscope and look. If the hairs are still white then its got a while, patience is the key at this point. Not waiting will only give you small yield

 

[SFC]

If no scope is available look at the calyx's. If she is ripe, or near ripe the calyx's will be pretty swollen. Also look for a stalling or stopping of new growth on the buds. "white" pistils are a sign of new growth, "Brown or red" pistils are your older growth bud sites.

I hope this helps you.