Possible Clues:

• Shrub that's no good in Asian country
• Mock-orange
• Extremely shady enclosure needs a shrub
• Is angry, having to move shrub
• Gray's Inn, for the most part, is to be refurbished in lilac
• Mock-orange plant
• Plant that's no good in Middle Eastern country
• Mock orange, lilac
• Use phone, say, erratically outside to get shrub
• Shrub produced by unknown group in South Africa