Linda Horsley and Bob Rocca have done their part to replenish the de-natured city. From a chain-link fence that borders Forest Park Parkway, roses have bloomed. Glimpsed, as they are, whipping by at car-window level, "Wild Rose Run" makes for sunny impressions on the commute. Horsley and Rocca remember when wild roses grew along the Parkway, and because they're artists and not horticulturists, they've worked to bring back a semblance of the past. The painted steel roses were placed in bud, and over the summer Horsley and Rocca have been opening the petals. And soon, it's planned, in the middle of autumn, the petals will drop.