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3 plants at 6 weeks flowing, 2 Afghani and 1 of unknow chronic origin. The 2 indica have lots of trichs, the one chronic, perhaps sativa hybrid doesn't have that many and harvest is a couple weeks out. Perhaps the sativa hybrid may need longer. Any comments? first 2 pics afghani, third and fourth sativa hybrid.
This is by no means an exact answer, but my two cents.
Indica strains typically veg quicker and flower quicker than their Sativa cousins. I'm guessing that you probably just need to let your Sativa flower for 1-4 weeks longer than the Indicas. Hopefully someone can verify this for you.
Looks like they have a ways to go.To be sure get a jewelers loop and check your trichomes,that's the way that works for me.
Yes, sativas most definitely have a longer flowering time. I'm not sure about your strain there, but some sativas can go far beyond indicas in the realms of flowering time.