How to Fertilize rock spleenwort?
Very dilute fern feed monthly during warm active frond growth

rock spleenwort · Asplenium fontanum
Also known as: smooth rock spleenwort
A fern which prefers alpine or rockery conditions with loose free draining soils in partial shade or full sun with slightly more moisture. Dislikes wet soils especially over winter. See advice profile on how to grow ferns
Very dilute fern feed monthly during warm active frond growth