How to Fertilize Digitalis chalcantha?
Apply a balanced liquid fertilizer every 3-4 weeks during the growing season.

Digitalis chalcantha · Digitalis chalcantha
In frost-free climates, may be grown outdoors in well-drained soil, in a sheltered spot in sun or part shade. Elsewhere, grow under glass in loam-based potting compost, in full or bright filtered light with low to moderate humidity. Water moderately during growth and sparingly in winter. See foxglove cultivation for further advice
Apply a balanced liquid fertilizer every 3-4 weeks during the growing season.