Porto Alegre Botanical Garden, Botanical garden in Porto Alegre, Brazil.

The Porto Alegre Botanical Garden occupies about 43 hectares on Salvador França Street, in the Petrópolis neighborhood. It holds collections of palms, conifers, succulents and cacti begun in 1957, plus native forest formations of Rio Grande do Sul. The Museum of Natural Sciences, on the grounds, exhibits fossils from the Paleorrota geopark.

Origins trace to the early 1800s when King Dom João VI attempted to send plants from Rio de Janeiro, but they never reached Porto Alegre. The modern project was realized later and developed into a major research facility.

The garden's name dates from 1959, when state law no. 2.022 turned the park into the Jardim Botânico. Its collections are grouped by plant family of ecological importance in Rio Grande do Sul, such as Myrtaceae, Rutaceae and Bignoniaceae, and by themed groups of condiment and scented plants. About 30% of visitors are students, teachers and researchers.

The garden lies on Rua Salvador França and covers about 43 hectares, with the Museum of Natural Sciences inside the grounds. Paths link the palm, conifer, cactus and native-forest collections, so plan a single route that ends at the museum. Much of the walking is outdoors and unsheltered.

The garden's name dates only from 1959, when state law no. 2,022 granted it the title Jardim Botânico; it had opened to the public a year earlier, on 10 September 1958, with almost 600 species already planted. Its remaining 43 hectares are what is left of an original 81.57-hectare area, much of it given away from 1964 to institutions such as the UFRGS School of Physical Education and the São Lucas Hospital.