Since most retail nurseries are small and personable businesses, they tend to hire retail staff based on personal attributes as much as on qualifications. This is one of those few idyllic industries in which nice people get the job. (At least this is some consolation for them not getting the girl.) Experience and education will, of course, win out and earn someone a better job when it becomes available, but less experienced and educated people are just as often hired for lesser jobs. There is always plenty of learning to do at work. Those high school kids who start out as inexperienced hosers can eventually learn enough about the plants that they water to be qualified to sell them to those nasty customers. College educated horticulturists with a good job and a bad attitude will likely always have the better jobs, but may not necessarily move on to the even better jobs as efficiently.