Possible Clues:

• Nigella — neo-vitalism (anag)
• Plant of the buttercup family — am I novelist? (anag)
• Plant of the Nigella genus
• Aim with novelist to cultivate flower
• A moist plant?
• A moist Nigella?
• Plant with blue flowers amid greenery
• Buttercup relative
• Flower typically given to Neeson?
• West Indian passion-flower