How to Fertilize Tulipa 'Robinea'?
Bulb-specific phosphorus feed every two weeks pre-flowering stage

Tulipa 'Robinea' · Tulipa 'Robinea'
Plant bulbs in late autumn, at a depth of 10-15cm (4-6in) in fertile, well-drained soil. Choose a sunny position, with protection from strong winds and excess winter wet. Lift bulbs annually, once the leaves have died down, and ripen in a cool greenhouse, keeping dry over the summer. See tulip cultivation for more details
Bulb-specific phosphorus feed every two weeks pre-flowering stage