Common loanword used in compound nouns (e.g., フラワーアレンジメント, フラワーショップ) and occasionally as a standalone noun, often with a slightly stylish or commercial feel compared to 花.
She is learning flower arrangement.
They decorated the venue with flowers.
A new flower shop opened in front of the station.
At the wedding, the groom gave flowers to the bride.
sunflower
mayflower
corn flour; maize flour
chicken flower
Borrowed from English 'flower'.