Hello. New to this site. I work for the Forestry/Landscape department for a city in the Twin Cities area. We're installing annual beds in the medians at our city hall/ civic arena/Library complex. And I'm looking for advice/suggestions. I'm looking for something low maintenance...doesn't require lots of deadheading to keep looking good. We use a ton of petunias on other sites. Boss wants to use something else. Right now he's thinking zinnias. These are going to be large beds and we have our hands full as it is. Site is irrigated. Small trees exist in medians...crabapples and lindens. We will be planting around the trees. Thanks.