The most common and most likely answer to this crossword clue is the 6 letter word IRISES
I've seen this crossword clue in The Guardian
I
R
I
S
E
S
More clues leading to the result IRISES
- One picks up plants
- Flowers: one comes up
- Regularly asked Siri about flowers
- Painting is about to come up
- One stands up as a Van Gogh painting
- Is about to get up, but flags
- Is about to revolt, but flags
- One grows up and blooms
- Flowers in roses I rightly pulled up
- More than one plant is seen covering hillside?
Buddy explains!

The straight part
We know that "flowers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flowers = irises.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 IRISES mean?
IRISES noun- A plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant)).
- The contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina, and which forms the colored portion of the eye (See Iris (anatomy)).
- A diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens.
- A rainbow, or other colourful refraction of light.
- A constricted opening in the path inside a waveguide, used to form a resonator.
- The inner circle of an oscillated color spot.
- (of an aperture, lens or door) To open or close in the manner of an iris.