Recently, I got into buying indoor plants. So I went to several nurseries and Campbell's was by far the friendliest, had the best looking plants and the best selection (much larger size options compared to others). It's too bad that Campbell's doesn't have a more prominent sign or logo to let others get a better idea about them from the street but they probably have enough business through word of mouth.
Side note = For a great selection of pots for indoor plants try Pikes in Ballantyne.