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what does the f1 mean in cannabis seeds

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.

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.

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.


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.


Our beloved marijuana strains are produced using several different breeding methods. Check out the terminology used to describe the unique genetics of different cannabis varieties.

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.

Female plants can produce S1 seeds through a process called “selfing”. Selfing is a chemically-induced process by breeders that causes female plants a certain amount of stress, resulting in them producing male flowers. These male flowers will then produce pollen, which pollinates the rest of the plant through self-pollination. Female plants that have self-pollinated will then produce what is known as stable S1 seeds, or seeds that have been “selfed”.

Although it seems confusing on the surface with so many letters and numbers, understanding the basics of cannabis genetics and cross-breeding will help you in the future to decide what you want to smoke, what you want to grow and if ever necessary, how and what you’ll want to breed together to get exactly what you’re looking for.

How Selfing Produces S1 Seeds

Certain strains have been bred to possess the stable and reliable qualities of autoflowers, which are known as “fast versions” or “early versions” seeds. These are F1 plants that have been bred with a strain of Ruderalis, which is known to be a very sturdy family of cannabis. Fast versions are best for growers who are new to growing, or who want something that will produce cannabis very quickly.

Backcrossing in cannabis breeding is the process of taking an F1 hybrid strain and breeding it with the original parent plant. The genetics of the F1 strain are crossed with the parent plant’s genetics, and the resulting seeds are referred to as BX1. Backcrossing cannabis plants is essentially how to stabilize a strain – in other words, how to preserve and guarantee certain desired traits that are shown in a particular plant.

Cannabis breeding is usually a step left for experienced growers, so let’s start with the basics first. Cannabis seeds are bred when a male cannabis plant of one strain pollinates a female cannabis plant of a different strain. The genetics of the male plant are then crossed with the genetics of a female plant, producing seeds of what we refer to as a hybrid strain. To do this, you’ll need to set up a pollination chamber away from your other plants so there is no cross-pollination occurring. Your male plant will be guaranteed to pollinate the female plant, which will continue producing buds but will also be producing seeds as well.

Eventually, I will achieve an F3 that is Lowryder Dominant in the vegging pattern, but still F1 typical in its Bud density.

However, if you back cross your F1 with Parent one again your F2’s turn out like this…
50% F1 trait for a given attribute.
50% Parent one trait for a given attribute.

Cannabis Breeding Genetics F1 and F2 Generations
In common with orchids and prize roses, Cannabis seed strains are grown and cross-bred by botanists to create new cannabis breeds with different characteristics.

Cannabis what’s f2? Second generation (F2)

There are many strains of each of the Cannabis varieties. cannabis indica and cannabis sativa.

Plant quality is lost because the variation in genes is extended and making it less easy to foresee characteristics. The process is endless; F2s can be bred with other F2s creating F3s, with a further loss of quality.

The strains were cross-bred by fertilizing isolated flowers from one variety with pollen from a strain of the other variety, creating offspring strains that were superior to the parents in terms of resistance to disease, yield, and levels of THC (the psychoactive ingredient in Cannabis), and could be grown better in northern latitudes.

Take my little project, that I’ve decided I’m going to do. SWT#3 x LR are the seeds I got. now if I back cross square it, only breeding the traits I want to keep… FAST TO AUTO-FLOWER and TIGHTER BUDS THAN A STANDARD LR.