Big Bud by Mr. Hanf Seeds, over 22% THC 169,50 EUR Delphinium Black Knight (pacific giant hybrid) in full flower in a DEvon garden Stock Photo Alamy Is it true that plants release CO2 during night and that I should not have one in my room? Culture Online UCL University College London 8 AM bamboo Yes, it's true. Bamboo is the largest grass in the world, and it can grow taller than a 10 storey building, up to more than 150 feet. Bamboo