pls refer this post about the location : http://hkplants.com/viewthread.php?tid=27973
is where i buy the 藍蝴蝶
" ... 錦田新豐花園,元朗新潭路朗廈段 由粉嶺方向入元朗, 咁去到一個回旋處既第2個出口, 路牌寫住八鄉wor~ 大生圍, 綿繡附近... "
but i see them moved most of the flowers to a big van, they said will drive to victoria park flower show la......
but u can try at 花壚,I think I did see them there before. GOOD LUCK^^