Below: Wildflower scene in Huntsville, a town in cottage country, Muskoka Region, southern Ontario (July 12, 2010). Took it that this was the result of a bit of disturbed land having been colonized by wild flowers. Think I was lucky enough to come along to see how things stood at that point in time.
I'm guessing that it would be a rather extreme challenge to try to produce such an effect, as this, through horticultural means.