How to Fertilize delphinium 'Merlin'?
Light balanced feeding every two weeks spring through early summer

delphinium 'Merlin' · Delphinium 'Merlin'
Will grow well in fertile, well-drained soil in full sun and apply a balanced liquid fertilizer every other week during the growing season. Set crown above soil. It will need shelter from strong winds; staking may be necessary. See staking: perennials and delphinium cultivation for further advice
Light balanced feeding every two weeks spring through early summer