IBL stands for “inbred line”, meaning that after several generations of hybridising a specific lineage, the strains become almost like a different family of strains. Skunks were hybridised and selected for their very pungent and potent nature, and after many generations, they developed into the Cheese family, which can be called an IBL.
Backcrossing refers to taking a hybrid strain and breeding it back with the original parent. For example, a male Chocolope and a female Jack Herer develop an F1 hybrid. When this F1 hybrid is hybridised with the original female Jack Herer, the resulting strain will be coined as BX1. When this BX1 gets backcrossed again with the original female Jack Herer, it will be coined as BX2, and so on. The genetics of the original female strain can be retained by keeping the plant in the vegetative stage as a mother, keeping the cuttings as clones or using tissue culture propagation.
F1 stands for a “first generation hybrid”. When two strains with completely different genotypes breed, for example, a Master Kush with Durban Poison, their offspring will be an F1 hybrid. When this hybrid is bred together with another F1 hybrid from the same batch (a sister or a brother), it creates an F2 hybrid. When this process is repeated, it creates an F3, then F4, and so on. After F5, the plants can be considered as IBL.
Landrace varieties originate from regions where cannabis plants have been growing for a very long time in the wild—centuries, or even millennia. This naturally creates stable, robust genetics that produce a homogeneous offspring. This means that the landrace strains from a particular area will develop very similar growth patterns, appearance, and chemical composition. Hindu Kush or China Yunnan are examples of pure landrace strains.
Poly-hybrids derive from mixing completely different hybrids with each other. For example, Master Kush and Durban Poison produce offspring called F1(A); AK-47 and White Widow produce an offspring called F1(B). When F1(A) and F1(B) have a lovechild, it will be coined as a poly-hybrid.
Breeding cannabis is a complicated art that can be performed in plenty of ways. Here, we describe the common terms surrounding various cannabis genetics and how they came to be. We decided to keep it short and concise, as all the scientific minutiae can be very complex.
You create an F1 strain by crossing two pure strains with completely different phenotypes. To achieve this, the grower will, for example, take 100 of their best plants and select only the very best mother plants based on a specific trait from one strain.
A few of the properties that can be improved through selection are rooting, growth potential, flowering period, color, bud structure, and yield.
F2 – Keep on crossing
When I first saw the term “F1 strain”, I seriously wondered what car racing and cannabis have to do with each other (and if it was wise to combine the two).
All the plants from these seeds will be very similar. This is great if you prefer a crop of identical plants.
The basics of growing plants are always the same. This also applies to cannabis. Male pollen pollinates the female plant. Nature has ensured this happens naturally.
Inbred lines are needed to capture recessive traits and create a consistent strain. Strains continue to be crossed for generations, each time selecting their desired properties.
He will not release any seeds until he is 100% happy and he knows that the only way he can really get to this point is by massive sampling rates selecting the best from hundreds of individuals for numerous qualities. (note where I put above that you get 100% F1 it should have read 100% F2 (50% F1 + 50% Parent one).
Breeding Cannabis, F1 and F2 Explained
For example, the popular Blue Dream strain produces both indica and sativa phenotypes. Generations and phenotypes are the reason for the wide variety of OG Kush species, which include San Fernando Valley OG, Larry OG, and Bubba Kush. The OG Kush phenotypes have been selected by different breeders and then bred to create a uniform variety.
You might, and probably will find, at this point, that the F3 back cross-squared isn’t what you were looking for when you started your project. It is then back to the drawing board to do it all over again in the hope that this time the genes fall a bit better.
They also make out that F4 back cross cubed your seeds will be 87.5% parent one trait. This is again incorrect. at F3 back cross squared your seeds will either be 100% F2 (50% F1 and 50% Parent One dominant, or 100% Parent One Dominant. at F4 back cross squared your seeds will be 100% F3