The most common and most likely answer to this crossword clue is the 8 letter word CROCUSES
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More clues leading to the result CROCUSES
Buddy explains!

The straight part
We know that "Flowering plants" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flowering plants = crocuses.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 CROCUSES mean?
CROCUSES noun- A perennial flowering plant (of the genus Crocus in the Iridaceae family). Saffron is obtained from the stamens of Crocus sativus.
- Any of various similar flowering plants, such as the autumn crocus and prairie crocus.
- A deep yellow powder, the oxide of some metal (especially iron), calcined to a red or deep yellow colour.
- A fraudulent doctor; a quack.