why does it have to be purple? I dont understand what makes people think purple is the greatest thing that ever happened to pot. Purple strains are good but its not guranteed that they will even end up purple because of the phenotypes. My advice to you is get something else. Oh and about the rain, yeah plants can survive in rainy enviroments but not if its flooding, make sure its not down in a ditch somwhere. Try to keep it on higher ground so that it wont take too much water. If you really want the best purple straing then get the purps. If you want an outdoor grow then get PPP or something and let it stay out a little longer then usual, the cold can make just about any plant turn purple