This should help you, GrowinGreen23.

There's a rather large distinction between the 'three' species [ or sub-species as one Carolus Linnaeus would have it ].

And as far as showing sex -- most sativa dominant strains show at least preflowers within 2.2 months. So it'd be safe to assume indica and ruderalis dominant strains would show much earlier -- ruderalis more so than indica.
Kush Over Reviewed by Kush Over on . When/how? When can you determin what strain something is? and how do you do it? what abut sex how early can you see that? Growingreen23 Rating: 5