The most common and most likely answer to this crossword clue is the 4 plus 2 plus 3 plus 5 letter word WARS OF THE ROSES
I've seen this crossword clue in The Sunday Telegraph
W
A
R
S
O
F
T
H
E
R
O
S
E
S
More clues leading to the result WARS OF THE ROSES
- Gentle champion’s stopping stock conflicts
- Back untrained gentle, brave men to have succeeded in conflict
- Thorny issues in this conflict?
- Struggles in Beds or originating further north?
- Flower power struggles?
- Conflict symbolised by different colours of house-plants?
- How fortresses tumbled around a series of battles
- So far, these rows turn into neighbourly disputes
- Row of houses whose rafters so rickety
- Weak champion’s splitting merchandise in dynastic struggle
Buddy explains!
The straight part
We know that "Conflict symbolised by different colours of house-plants" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case conflict symbolised by different colours of house-plants = wars of the roses.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.