Possible Clues:

• Never leaves go of it
• Having year-round foliage
• Having enduring freshness
• Ivy, perhaps, always growing
• Non-deciduous tree - always immature?
• Oscar-winning song from 'A Star Is Born'
• Never leaves off - always putting there
• Never with any experience, it seems
• Holly is permanently jealous!
• Not all shrubs are right in English border, and shortly die