Possible Clues:

• Holly, say, enduringly popular
• Bearing foliage throughout the year
• In binomial nomenclature, “sempervirens” denotes ____ plants
• Tree in a nickname for Washington State
• Always fresh in box, perhaps
• Like some winter trees
• * Yuletide tree, e.g
• Unfading Queen good with soldiers in uniform
• Holly or ivy, for example
• Always on the go, remaining fresh and vital