To water the flowers in English, you would say "water the flowers" or "water the plants." This phrase comes from the verb "to water," which means to provide liquid, especially water, to something in order to help it grow. Here are some examples of how you can use this phrase in a sentence:

I like to water the flowers in my garden every morning.

Can you water the plants while I'm away on vacation?

The plants are looking a bit wilted. I think they need to be watered.

It's worth noting that "water the flowers" is a fairly literal translation of the Chinese phrase "浇花." If you want to be more descriptive or creative in your English, you could say things like "give the flowers a drink," "quench the plants' thirst," or "nourish the blooms with water."