Hundreds of people holding signs and wearing pins and stickers -- some saying, ”Hey GMOs, stop trying to get in my plants” -- gathered on the lawn of the Boulder County Courthouse on Tuesday to support banning genetically modified crops on open space land. Boulder County is in the process of crafting a management plan for the 18,000 acres of cropland overseen by the open space department, which will include a policy on whether to allow genetically modified crops. A nine-member volunteer advisory panel has been meeting since February to craft a set of recommendations.