Four O'clocks are so pretty but they can be invasive down here. I consider them a weed. At our other house we had way TOO MANY Four O'clocks! They produced so many seeds I could not ever keep up with them and the tubers grew so large that they were very difficult to dig up. I never noticed fragrance on any of ours; we had pink, white (lots of white!) and at one time the striped colors. Your bounty this year may be from birds gifting you with seeds.