Query: Garden plants of the Northern and Eastern US, that aren't found in the Southeastern US
Domain: plants
Relevant documents:
Iris versicolor
Pityopsis graminifolia
Symphyotrichum novi-belgii
Calycanthus
Asclepias tuberosa
Persicaria pensylvanica
Dicentra canadensis
Vaccinium corymbosum
Panicum virgatum
Chasmanthium latifolium
Artemisia ludoviciana
Liatris spicata
Quercus palustris
Sambucus nigra
Schizachyrium scoparium
Nuttallanthus canadensis
Thuja occidentalis