RE:RE:RE:Co2 GroNo known competition, Co2 gassing is used both in the U,S, and Canada. Health Canada launched zero tolerance of foliar applications on cannabis after some grower was caught putting something toxic on leaves,hence the ban. Grow is applying for foliar exemption given that their spray is only water and CO2. Foliar is allowed under any other growth applications in Canada. And all growth applications in the U.S.