'Strain' is a subset of 'variety' which is a subset of 'species.'
"Sour Diesel" is not a strain but a variety. If Joe and Bill each grow out some Sour Diesel, and keep growing it out over time, due to their choosing of different plants and genetic variation, they will eventually be growing two different strains of the same variety.
"Sour Diesel" is not a strain but a variety. If Joe and Bill each grow out some Sour Diesel, and keep growing it out over time, due to their choosing of different plants and genetic variation, they will eventually be growing two different strains of the same variety.