price of a flower; flower cost
Refers to the monetary cost of purchasing a flower or flowers.
母の日にカーネーションの花代が高くなる。
The price of carnations goes up on Mother's Day.
Specifically the fee paid for a geisha's time and entertainment at a party or gathering.
お座敷遊びの花代は想像以上に高かった。
The fee for the geisha entertainment at the party was higher than I imagined.
Compound of 花 (flower) and 代 (cost, fee). The geisha-related sense is an extension from the literal flower cost, as geisha entertainment was traditionally associated with flower districts.