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He thought of ScrOG in jail

He thought of ScrOG in jail

On October 26, 1989, the DEA in conjunction with dozens of other law enforcement agencies raided hydroponics stores in 46 states, arresting 119 people, seizing several indoor gardening shops and thousands of cannabis plants. The largest single seizure belonged to Wolf Segal (Farmer in the Sky), 12,000 + plants growing as "Sea of Green" (SOG). Operation Green Merchant became known by the early cannabis pioneers as "Black Thursday" as many people swept up were hauled off to serve time in jail.

The Sea of Green method and cloning cannabis plants were techniques learned and brought to the US from Holland in the 80s. SOG is used to create "perpetual harvests". The method involves high plant counts per cu ft/m and short grow cycles. Clones are introduced to 12/12 flowering with little to no veg cycle. Many growers cannot use SOG due to local plant count limitations. 

It was the high plant count associated with SOG that got Wolf "top grow bust" recognition. And while serving time in jail, he came up with the concept of Screen of Green (ScrOG). The concept was to grow short bushy plants with longer veg cycles that were 2x3 times more productive than traditional growing methods. This method would allow Segal to have big yields with lower plant counts.

Wolf explains the concept in this video shot at IndoExpo, Denver 2017.


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  • Gary Memelstein
Comments 3
  • Gary

    It was good seeing you in Seattle Wolf! Following our discussion regarding the origins of SOG and cloning cannabis. I went back and listened to the panel from your podcast with the “cast” from operation Green Merchant It was the discussion with Steve Hager at approximately 30 minutes in where he and you had a different understanding of the origin of SOG. He claimed that it was borrowed from vegetable horticulture in Holland. That Green Merchant rock star panel and discussion was awesome by the way!!


    Hey I remember when I was researching for my first indoor Grow I came across an old video explaining about the perpetual system and this guy was packing them in behind his clothes in his wardrobe I hope he never wore them, but he took clones every two weeks and looked after the mothers really well I just never managed to to get the system running and ended up with huge plants that were constantly growing past my lights ,We are really looking forward to this grow I’ve been in an out of hospital recently so really need the Meds that’s a fantastic story it’s great to see a little older guy embracing Inovative design and marrying it with great proven techniques .What a great guy, my Dad was an ole stonner I miss his crazy engineering he practiced on Joint making ,always impressed my friends lol ,That’s a great way of turning something awful into something Fabulous l can’t wait to get that known about over here thanks for the share, We got bad news over here yesterday they are using Pharma to control our Medical Cannabis program in the future,We don’t currently have one but we are strong in numbers and we won’t go away regardless of there short sighted Greediness .Growers Luv ?

  • M. Wolf Segal
    M. Wolf Segal

    The blog is almost completely correct except for one detail. Sea of Green went TO Holland from Seattle, not vice versa. It happened in may of 1985 when a man named Greg McA carried the SoG method and the entire Northern lights Collection to Seedbank Nevil. Be well and rremember, “Growing greener is growing wiser,”

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