The book "The Mystery of Fertility" showcases 14 large-scale, site-specific, growing, and ephemeral installations created over the past 5 years by Gerda Steiner and Jörg Lenzlinger. The mystery of fertility manifests itself in abundant biodiversity, overflowing imagination, and crystallizing artistic fertilizer in various locations such as an open-plan office, a monastery library, an old silver mine, a yew forest, at an old oil biotope, or in caves. 190 colorful full-page illustrations provide an overview of the spatial situations and changes, immersing the reader in individual components and details. Texts explain the key connections in the creation, research, or collection of materials. Photos and texts are by Gerda Steiner and Jörg Lenzlinger.