Beatrix Potter is known to almost every parent, but not as well known as her most famous creation, Peter Rabbit. In Marta McDowell’s new book Beatrix Potter’s Gardening Life: the plants and places that inspired the classic children’s tales (Timber Press $24.95) we meet Peter’s progenitor. In 1890, the 24 year old Beatrix bought Benjamin Bouncer at a pet shop and used him as the model for Peter for some paintings that she sold. That was the…