things that greenspaces needs," said chris cowell, planner. "the downtown greenspaces could vary by simply adding planters to the sidewalks to give that pop of color to areas with benches and swings," said michelle schoening, siouxland's news channel. "maybe rooftop gardens, green walls, planting vines and other plantings on walls in sioux city. utilizing other buildings or spaces that aren't maybe being utilized and make them green," said chris cowell, planner. and the skies the limit on the greenspaces to occupy. "everythiing public, everything private. what downtown when you come in as a visitor or as you're walking to lunch would make a difference in your daily life," said ragen cote, executive director of downtown partners sioux city the final design plan from the university of iowa students will be presented in may. but the key to the success in a project like this...is the power of public input. "for the city it's a chance to say, these are the things were would like to see," said ragen cote, executive director of downtown partners siou