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A remarkable park, containing 19 gardens including Japanese, desert, rose, Florida, palms and California native plants to name a few.  The park includes 17 museums as  well as other attractions.  Located in San Diego, CA.

Well-known, with over 40 gardens and garden features including fragrance and children's gardens, herb, native flora and rock gardens.  Publishes many respected how-to garden books.

Located in Victoria, BC and a Canadian historic site as well.  Gardens were developed in an old quarry.

Botanical gardens in Chicago, noted for many coneflower and other introductions, and plant research.

The nature center is a facility  of the research institute.  It contains an arboretum that includes native grasses and wildflowers,  a wildscape garden for wildlife, a pollinator garden and a cacti & succulent collections.  All plants are from the Chihuahuan Desert.

In existence for some time, demonstrates all types of gardening including xeric

Features native plants in the cacti and agave families -- over 4000 species and 17,000 plants in a natural setting.

Rare and exotic tropical plants

Nr. Pasadena, CA in San Marino.  Spectacular gardens (rose, Japanese, Chinese, bamboo forests, herb,
bonzai,  cacti among others), largest collection of euphorbia in U.S.,  art & old manuscripts collections, conservatory

Gardens developed by the Duponts; tours, educational information

Another national treasure this one featuring Hawaii natives, palms coffee plants as well as plants from Micronesia and Polynesia.  Collections of ficus, bamboo and aroids. Gardens are in Florida and Hawaii.

Botanical gardens demonstrating  native, adapted, and water plants; seasonal displays and gardens; two
conservatories;  includes Aquarium and Zoo

This garden features desert and rainforest gardens, bamboo groves, Mediterranean climate landscapes,
succulents and herb gardens among others.  Located north of San Diego.

Activities, hikes and educational reserves.

Botanical collections include a  rose and cactus & succulent garden, a conservatory with orchids, heliconias and gingers, and Japanese and herb gardens among other exhibits.  Click on "About" and then "The Gardens" on their website for more info.

Tucson demo gardens using native & adapted plants

Website provides information on  hours and admissions, but little info about the gardens themselves. 
This is reported to be a small garden but worth the time for a visit.

A spectacular place featuring asian plants, azaleas & dogwoods, dwarf and slow growing conifers, holly & magnolia, herb & perennial gardens.  Residence of the U.S. national Bonsai  and Penjing collections (AMAZING!).  Includes a grove of all state trees.

Exhibits and demonstrates water  conservation gardening to include a meadow, turg & ground cover
exhibits,  cacti & succulent garden, container garden, native plant garden among others.