Show rubber growth experiments experiment rubber plants that are native to dry regions are belne being tested in california in the coast districts as well as to in the interior valleys several dry country rubber plants are known in mexico while others are reported in south america africa and madagascar the production of rubber from the mexican guayule plant argen tatum has been investigated carefully by a private corporation and the stage of agricultural practicability Is believed to have been reached ibcal in california the guayule rubber plants in arizona and california amount to several hundred acres |