How to Fertilize Geranium phaeum 'Nightshade'?
Mild balanced flower fertilizer every four weeks spring to autumn

Geranium phaeum 'Nightshade' · Geranium phaeum 'Nightshade'
Thrives in moderately fertile, moist but well-drained soil in partial shade, but will tolerate most soils and positions unless waterlogged
Mild balanced flower fertilizer every four weeks spring to autumn