What are the most potent in "effect" landraces you have tried?

[MiG]

@TropicalBiophile

For example, it amazes me that in the Phylos Galaxy colombian strains appear at the very margin of what I understand to be the sativa side. How come that a country with no tradition of smoking ends up with something so particular?

Creo que olvidas parte de la historia de nuestros países… Te pongo un link a “La Perrera”:

The Dogs' House: La Perrera

Ok, @MadScientist: a ver y little history of psicoactivo cannabis in Spain: