Sexing plants in veg

[Uriahjacob]

Does anyone know if female preflowers produce the 2 white hairs immediately? Every time I have found preflowers while plants were still in veg they were on the plants 2 weeks or so and ended up being males.

[9fingerleafs]

If You wait longer they do

[Uriahjacob]

Any way to tell before the hairs appear?

[9fingerleafs]

There are lab sex test like 23 and me but for plants