Paging Dr. Green Thumb! Paging Dr. Green Thumb!! Get ready Florida, you may soon be able to grow your own weed. According to NBC-2, Florida voters may soon vote on a constitutional amendment that would allow you to grow your own cannabis. You only have to be 21 years of age and keep the plants behind a locked door. In order to get on the ballot in 2022, activists will have to get 891,000 signatures. You add your name by checking out the petition here.