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.
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.
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.
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.
This is one of the better articles dealing with Polyhybridism… I wish you could talk more about something that I have been dealing with, the destabilization of plant ‘chemistry’, for want of a better word. Up until 12 years ago I grew only Landraces and experienced no ill effects from the regular consumption of cannabis… However, from the very first run of hybrid strains, I have been plagued with paranoia, stress, and panic attacks. I thought it must just be the worsening of my PTSD symptoms. I kept trying different strains, over a hundred so far. I turned towards CBD strains in hopes that reducing THC and THCV would solve the problem, but things kept getting worse… It wasn’t until I started reading up on Landraces that I discovered my error.
Hybrids are not stable plants and this goes much deeper than just the traits of the F1,2,3 string. It goes into the stability of the plant’s chemistry. Landraces have stable chemistry, because of hundreds and thousands of generations of inbreeding, and the effects are calming and mild, even in many Sativas. Even though these Sativas have an uplifting effect, only some very extreme THCV strains cause paranoia and jaw crunching stress and panic.
With all these ‘wannabe breeders’ stacking hybrids upon hybrids, they have created a mass of polyhybrids that give, what can only be called a ‘DIRTY HIGH’. It didn’t matter how far I took the CBD:THC ratio, the effects were getting worse and took my PTSD symptoms to the point of needing to be hospitalized. I was becoming dangerous to be around. When I read that my huge collection of Landraces held the answer I stopped and chopped.
The withdrawals from these polyhybrids were beyond description. I have stopped smoking dozens of times in the past, with minimal effects, lasting less than a week. These withdrawals made me want to die and were almost unbearable for over 7 weeks. My wife wanted me to move out to the barn because I was worse than an old bear being woken up during my winter sleep. It was in this week that I got my first full night’s sleep.
As the smoke cleared, I began to notice that there was a resurgence of Landraces taking place across the world. Landrace preservation groups are popping up everywhere. After communicating with several, I found that they are of the same opinion. Polyhybridism is a plague upon the earth and that the effects on consumers are negative at best.
I will give you an example. My last season I decided to grow out two extreme THC strains, one Sativa and one Indica. Both clocked in at just under 25% THC. This was the straw that tipped my scale. Despite high THC levels, there was virtually no buzz, only jaw-grinding stress, paranoia, and panic… no different from the almost pure CBD strains.
I could not help but remember my earlier history with Thai’s, Colombian’s, Afghani’s that clock in at 6%-12% on a good day that flat out put you on the couch or made you clean behind your appliances, with a calm clean buzz, minus all the fear and panic.
It just so happened that I know a PhD Botanist who explained this along the same lines you used for your article, but took it one step deeper and said that hybrids have unstable ‘chemistry’ and it takes about a dozen generations of inbreeding to clean it up and restabilize… Since you have this platform, I am hoping you can address this in an expanded article.
It has been four months since I have left Polyhybrids in the dust and I am only now beginning to have normalcy return to my kind-hearted nature… I shake to the core when I reminisce about the pain of the last few months/years… I realize that there are two generations of growers out there who know nothing but the ‘chainsaw buzz’ these Polyhybrids produce.
There was a man, about two years ago, that blamed weed for making him kill his wife… I scoffed when I heard that… After the last six months of what I just experienced, I no longer scoff… People with unstable brain chemistry have no business messing with polyhybridism… I cringe at the thought of all the researchers looking for mental health answers in the wrong place… Articles like yours have a chance of reaching these researchers and consumers… Will you answer the call.
Some breeders take years to develop the perfect strain, as in the case of Charlotte’s Web, one of the best-known high-CBD cannabis strains. The designation “IBL” next to the name of the strain indicates that the variety was bred as a result of repeated crossing over 2 or more generations. Also, the designations “F1” and “F2” are often found, which speak of a generation.
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’ first roots emerged in northwestern China, a study shows.
traditional landraces that have only interbred with similar strains and so have almost identical genes
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.
The hybridization process was first carried out in the late 1850s by the monk Gregor Mendel. His first experiments were with pea plants. Mendel crossed two different types of peas and raised their offspring.
Continuous breeding of varieties creates almost identical offspring. The seeds should produce incredibly similar plants. For example, a common myth says that the G-13 indica strain was bred for 13 generations until it was unexpectedly presented to the public.