$25 Gift Certificate. Dedicated gardeners as well as the full spectrum of homeowners depend upon Mostardi Nursery for the best plants in all seasons and for all reasons. We feature distinctive plants for the both indoors and out, along with home and garden accents inspired by nature. For over 25 years our business has been growing at our location in the western suburbs of Philadelphia. Our facility includes the greenhouses where we grow many of the seasonal flowering plants that help us to ensure the superior quality and selection that our customers have come to expect.