How to Fertilize El Hierro giant houseleek?
Very dilute low-nitrogen succulent feed monthly in warm growth

El Hierro giant houseleek · Aeonium hierrense
Grow in full sun under glass in a cool greenhouse or conservatory; use a gritty loam-based medium and allow it to dry out slightly between waterings; for more advice see houseplant cacti and succulent cultivation
Very dilute low-nitrogen succulent feed monthly in warm growth