Wildflowers JAPANESE KNOTWEED: (Fallopia japonica or Polygonum cuspidatum). Although the flowers of this large herbaceous perennial plant may be said to be somewhat attractive, this plant is placed among the worst Creeping Fig (Ficus pumila) Plant Care & Benefits Guide Prairie Gentian, Eustoma grandiflorum, in a plant pot Stock Photo Alamy Honey Locust Fast Growers Moon Valley Nurseries