Rolling Greens NurseryOnly a tiny sign on a steep narrow road marks the entrance to Rolling Greens Nursery a modern-day plant metropolis that has until recently been the best-kept secret of Southern California professionals. Now open to the public, the enterprise offers a plethora of plant options. Along with expert advice from owner Greg Salmeri, the savvy establishment boasts a 10 to 25 percent lower-than-retail price range. But the true coup de grâce for plant enthusiasts is the unsurpassed freshness of the botanical fare, due in part to the constant commercial turnover (9528 Jefferson Blvd.; 310/559-8656, ).