Holy Grail S1 is a documented cannabis cultivar in the Strain Encyclopedia. It is listed with the parent cross Holy Grail (Kosher Kush x OG #18) selfed.
About
Holy Grail S1 is a feminized cannabis variety produced by selfing Holy Grail, itself a cross of Kosher Kush and OG #18. Selfing, the process of pollinating a female plant with its own pollen to produce S1 seeds, preserves the genetic character of the original Holy Grail while yielding an all-female seed line. The result is a strain that carries the full weight of two deeply established OG-lineage parents, concentrated through inbreeding into a stable, feminized form.
Because no additional terpene or chemical data was provided beyond the known parentage, the aromatic and flavor profile of Holy Grail S1 can be reasonably understood through its genetic background. Kosher Kush is widely recognized for heavy earth, pine, and fuel notes, while OG #18 brings a similarly resinous, lemon-fuel character typical of classic OG Kush expressions. Growers familiar with either parent will find the offspring operating in recognizable territory — dank, resinous, and unmistakably OG in character.
Effects commonly reported with Holy Grail and its descendants tend toward the heavy, body-focused end of the spectrum. Users frequently describe a deeply relaxed physical state accompanied by a quieting of mental activity. It is the kind of strain experienced growers and consumers associate with evening use, given how consistently its lineage leans sedating. These are commonly reported experiences and individual responses will vary.
On the cultivation side, the feminized seed format makes Holy Grail S1 straightforward to run without the need to identify and remove male plants, which suits both smaller personal gardens and larger production environments. Beyond that, specific grow data such as flowering time, yield, or preferred environment were not included in the available information, so growers would do well to reference phenotype-specific reports or draw on what is known about comparable OG-lineage cultivars, which typically prefer moderate humidity and respond well to training.
From a breeding standpoint, the S1 designation marks Holy Grail S1 as a preservation and stabilization project rather than a new genetic direction. It is designed to lock in the traits of the original Holy Grail in reproducible, female form — a practical choice for growers who want consistent access to that genetic profile without maintaining a mother plant.