The Palomar Cactus and Succulent Garden is a noteworthy part of the Arboretum. It is located at Comet Circle Drive and Mission Ave on the San Marcos campus of Palomar College. The Palomar Cactus and Succulent Garden has about 40 individual Gardens that provide great examples of Xeriscape and fire resistant plants. The plant collection totals approximately 3,000 different species or varieties form around the globe. The site is a 2 ½ acre plot with .92 of its total size fenced in. The fenced section houses the rare and more valuable species. A host of the other significant accessions can be found scattered throughout the garden, many of which are humming bird and butterfly attractants, as well as many varieties that have ethno botanical uses.