Can I dry my cannabis in Grobo? Robyn March 21, 2018 21:34 Updated Follow Yes, Grobo has the ability to dry your harvest. An add-on will be required which will be available for sale in Summer 2018. In the meantime, check out our video on how to harvest your cannabis! Related articles How do I harvest cannabis? What kind of water should I use? Is it smell proof? How many harvests can I get out of a Grobo? Do I have to use Grobo brand nutrients? Comments 0 comments Please sign in to leave a comment.