Joe EskenaziGrowing manzanitas takes a green thumb -- and rodentsThese are heady times indeed for the scientists who crawl through the dirt to study the short, sprawling plant species that all but exclusively calls California home -- the manzanita. Yesterday we reported that two of the state's top experts have weighed in that the plant until recently hidden for half a century or more by weeds and the Doyle Drive highway is a Franciscan Manzanita. Genetic tests are pending -- but it seems this