The most common and most likely answer to this crossword clue is the 9 letter word CONFLUENT
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Buddy explains!

The straight part
We know that "Like flowers when meeting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like flowers when meeting = confluent.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CONFLUENT mean?
CONFLUENT noun- A stream uniting and flowing with another.
- (of two or more objects or shapes) converging or merging into a continuous shape.
- (of wind) which converges, especially when viewed on a weather chart
- Describing cells in a culture that merge to form a mass
- (of a triangle) which is exactly the same size as another triangle.