Missing My Old Garden

Since moving to the city, I find myself staring out the window at the concrete landscape, remembering my old garden back home. Every time I see a flower on the street, it tugs at something inside me, nostalgia, I guess. I keep trying to get plants here but nothing thrives like they did in our little house's yard. Am I just being silly or is this normal? How do you deal with leaving behind such happy memories?