Possible Clues:

• Tree or shrub with yellow or white flowers
• Shrub about to be planted in a cold American state
• Prominent part of a giraffe's diet
• A CA is prickly over the CIA
• Plant like wattle
• Tree that's a favorite of giraffes
• Pea family shrub
• Plant spies to pursue leaders of agitators, communists and anarchists
• Article about American spies in plant
• Food for a giraffe