Eh, I can do an update after the past week or so's craziness.

Dendrobium: First ticket gacha
Daisy: First step-up gacha
Sakura #1: Second ticket gacha
Alpinia: 100 NG roll from Kerria gacha
Hanamomo: Third ticket gacha
Dianthus: Fourth ticket gacha
Dogwood: Dogwood step-up (third step-up gacha)
Sakura #2: Black Friday deal
Pumpkin: Black Friday deal
Christmas Rose: 50 FG roll, priority gacha
Sakura #3: Christmas ticket
Mei: New Year's launch gacha
Cattleya: Developer's Choice gacha
Helenium: Valentine's Day gacha
Dianthus #2: Step-up gacha #10
Dendrobium #2: 50 FG roll, Viola priority gacha
Viola: Ticket gacha #6
Lagurus: Easter ticket gacha
Herbaceous Peony: Rainlily popularity poll winner gacha
Burning Bush: Burning Bush step-up gacha
Mistletoe: Bonus Step-Up Gacha
Burning Bush #2: Bonus Step-Up Gacha #2
Cattleya #2: Bonus Step-Up Gacha #2
Iberis: Summer Sale Gacha
Nerine: Summer Sale Gacha
Wax Vine: Summer Sale Gacha

Christmas Rose #2: NG premium
Mimosa #1-3: NG premium
Cherry: NG premium
Kerria: NG premium
Apricot: NG premium
Maple: NG premium
Black Baccara: NG premium
Cactus: NG premium
Oncidium Bride: NG premium
Ionocidium: NG premium