- Lessons on Cacti (1917)
- The Cactus: Its Cultivation, History and Characteristics (1919)
- The Complete Guide to Cacti (1922)
- Cacti: A Guide for the Collector and Grower (1928)
Folger also wrote a number of short stories and poems, which were published in various magazines and anthologies. She was a talented writer with a deep love of nature and an appreciation for the beauty of cacti. Her work has been praised for its accuracy, clarity, and enthusiasm.