Book excerpt: This Frontiers Research Topic "The Brassicaceae- Agri-Horticultural and Environmental Perspectives" is an effort to provide a common platform to agronomists, horticulturists, plant breeders, plant geneticists/molecular biologists, plant physiologists and environmental plant scientists exploring major insights into the role of important members of the plant family Brassicaceae (the mustard family, or Cruciferae) in agri-horticultural and environmental arenas.