Using plants native in the landscaping around your library has many benefits – not the least of which is that you should not have to water the plants after they’ve been established (2 years).
“Native plants provide a beautiful, hardy, drought resistant, low maintenance landscape while benefiting the environment. Native plants, once established, save time and money by eliminating or significantly reducing the need for fertilizers, pesticides, water and lawn maintenance equipment. ” –EPA.gov
Here are some great web sites to figure out what plants are native to your area: