If you're outside the band of green going to white (Ohio, Washington state, Pennsylvania)... You'll only see it if you have
1) a clear view of the Northern horizon (no high tree line close by)
2) minimal light pollution (lighted windows, street lights... any sort of light)
3) No clouds to your North.
I'm thinking that at work in the garden... only if that garden isn't around a lot of lights and you don't have a city to your North that is going to cast a "glow" on the Northern horizon. Not likely, I'd think. But I don't know precisely where your garden is.
