Viperis an invigoratingsativa that was bred from an indigenous Burmese landrace and a native Mexican strain known asBlackseed First cultivated by Reeferman Seeds Viper inherits buzzing cerebrallytargetedeffects and a spicy citrus aroma In a show of its nearly pure sativa genetics Viper grows tall and bears fluffy buds that finish their flowering cycle in about 10 weeks