How to Fertilize sceptre foxglove?
Balanced perennial feed every four weeks from spring through summer

sceptre foxglove · Digitalis sceptrum
In frost-free areas, grow in a sheltered position in a sunny to partially shaded site in well-drained soil; in frost-prone areas, grow in a cool greenhouse with minimum night temperatures of 5-10°C, in medium-fertility loam-based compost, such as John Innes No. 2, with added sand and leafmould, water plentifully in summer but moderately in winter, and keep plants well ventilated
Balanced perennial feed every four weeks from spring through summer