Possible Clues:

• It's blooming sharp on the bird's foot
• Plant with spikes of flowers
• Cat's showing pleasure, mostly stalking birds - it grows
• High-flier's a stimulus to the plant
• Goad bird hovering over plant
• Mediterranean plant with spikes of blue, pink or white flowers
• Caper and egg plant
• It’s a bit of fun to encourage flowering plant
• Informal name for some kinds of delphinium
• Exaltation and short satisfied expression for one in bed