What skill? You plant seeds, you weed, you water--and you're rewarded with good eats--and flowers, too, if desired. I have lived in northern climates, and gardened, as did my neighbors, I might add. The thing is, you do have to pull yourself away from the teevee and/or the video games, and you do have to invest a little elbow grease--the lazy wouldn't fare well in this endeavor.
If you live in an urban condo, where do you put those seeds?