If you breed for high THC and wanting to make something around 30% there's only a few strains that can produce that bloodline.
Chem D, GMO, Gorilla Glue, GSC and MAC 1 are what you would want to be working with to have a chance at breeding a 30% strain.
Bubblegum is around 14% THC , in my experience there's no amount of selecting/breeding to create a 30% bubblegum, landrace etc.
Too much focus is on the females, breeding is going to be limited by the male donor.
With most stuff being heavily inbred using some unrelated genetics is important. Using a landrace or even unrelated dutch/Spanish lines is a good to add vigor and terps.
Landrace by it self or 50% is usually not that great, usually weak and leafy.
The magic number for me is 1/4 to 1/8 landrace and 80 to 90% modern strain.
Chem D, GMO, Gorilla Glue, GSC and MAC 1 are what you would want to be working with to have a chance at breeding a 30% strain.
Bubblegum is around 14% THC , in my experience there's no amount of selecting/breeding to create a 30% bubblegum, landrace etc.
Too much focus is on the females, breeding is going to be limited by the male donor.
With most stuff being heavily inbred using some unrelated genetics is important. Using a landrace or even unrelated dutch/Spanish lines is a good to add vigor and terps.
Landrace by it self or 50% is usually not that great, usually weak and leafy.
The magic number for me is 1/4 to 1/8 landrace and 80 to 90% modern strain.