How to Fertilize lupin 'Red Rum'?
Light low-nitrogen feed once in spring and again before flowering

lupin 'Red Rum' · Lupinus 'Red Rum'
Grow in moderately fertile, humus-rich, light, moist but well-drained soil in full sun or light, dappled shade. May need support (see staking perennials)
Light low-nitrogen feed once in spring and again before flowering