How to Fertilize Canary Island foxglove?
Balanced perennial feed every four weeks spring through summer growth

Canary Island foxglove · Digitalis canariensis
Under glass grow in loam-based potting compost John Innes No.2 in full or bright filtered light with low to moderate humidity, during growth water moderately and apply a balanced liquid fertiliser monthly, water sparingly in winter; outdoors, in frost-free climates grow in moist but well-drained soil in sun or part shade with shelter
Balanced perennial feed every four weeks spring through summer growth