柊
holly
On-Yomi: シュ
Koohii stories:
1) [astridtops] 8-3-2007(30): The holly tree has leaves which are always green. This is very practical in winter, when so much isn't, so that's why it became very popular as christmas decoration.
2) [mantixen] 26-7-2009(10): The holly is a tree that lasts through winter (aka the "holly days") (thanks herman).
3) [herman] 24-1-2009(6): All the best holly-days are during the winters, x-mas, new years…emperor's birthday?
4) [Megaqwerty] 20-6-2007(2): Winter is when I dress the trees with holly and good Christmas cheer.
5) [hirata] 4-2-2013(1): Cute tsundere Hiiragi Kagami offers you a Christmas gift under the holly tree one winter night. Naturally, she's looking away from you in an attempt to hide her feelings. (The kanji is pronounced ひいらぎ, and is used in the last names of both of the Hiiragi sisters in Lucky Star.).