You can visit the Botanical Museum and Garden at the University of Siena: founded in 1856, the botanical garden extends for 2.5 hectares and is located just outside the city walls. Here, you can find more than 2,000 plant species, like exotic cactus plants, Tuscan ferns, fruit trees, beech trees, white firs and plants used for food, fodder and to make textiles. You can also admire Ginkgo biloba, giant sequoias, junipers, unique plants that were already around in the 1800s like the well-known quince, honey locust and the fascinating Osage orange.
The herbarium, known as the Herbarium Universitatis Senensis, is where more than 90,000 dried plants are kept. The garden’s greenhouse (built in 1875) is a must-see, which replicates the warm and wet climate characteristic of forests on the equator, as is the tepidarium and the limonaia.