Possible Clues:

• Plant in America around spies
• Food for a giraffe
• Wattle genus
• Each cat essentially spies a tree
• Tree that giraffes love
• “____ Avenue” is a clichéd suburban street name
• Ark of the Covenant wood
• Plant’s account supported by a covert US group
• Plant succulents, passing time in borders of arboreta
• Mimosa tree, e.g