Robin Parer is an Australian-born horticulturist who lectures frequently to garden groups and societies throughout the United States. Over a long career she has owned and operated Geraniaceae Nursery in Marin County near San Francisco for the past forty years. She has collected and propagated over 500 geranium species, selected color forms and hybrids. She also has a large collection of erodium species, scented leaf pelargoniums, Martha Washington (Regal) pelargoniums, angel and pansy face pelargoniums and pelargonium species from Southern Africa. She has traveled widely, collecting both in the field, and from nurseries in the UK, Europe, South America, Southern Africa and Australia. She has been a regular participant in the San Francisco Flower and Garden Show. She has won Best of Show several times for her Marketplace Exhibit, and has also received an Outstanding Marketing Presentation Award. She received an Annual Award from the California Horticultural Society for Outstanding and Meritorious Contributions to Horticulture in California. She wrote A Plant Lover's Guide to Hardy Geraniums, which was published by Timber Press in 2016.

Specimen plants from her collection of Geraniaceae are displayed in a one acre demonstration garden along with a collection of perennial flowering shrubs, and garden sculpture by local artists. The garden and nursery are open by appointment.