The hilltop garden has offered us just this kind of wonderment. I still remember planting the seeds for all the different sunflowers, and four o'clocks, and the corms for the about 80 gladiolas. and doing just what I described above. and now it's right at the stage where I am enjoying some of the fruits of the labor.
And even better is when you receive a complete surprise! This was the very hill where we scattered wildflower seeds last year. Sadly nothing seemed to take off, but this year a few rogue zinnias have sprung up amongst the sunflowers.