Robin Mittenthal is chairman of the board that oversees Eagle Heights Community Gardens, which has 537 plots tended by about 1,500 gardeners near the family housing area at UW-Madison. He is a former Minnesota organic farmer and is now a graduate student in entomology who is studying the effects of organic fertilizer on insect pests. Mittenthal, 36, said the huge collection of plots has a 30 percent turnover each year and a small waiting list. Because Eagle Heights has a large contingent of foreign student families, the contents of some plots can be unusual.