The most common and most likely answer to this crossword clue is the 9 letter word LEYLANDII
I've seen this crossword clue in The Times
L
E
Y
L
A
N
D
I
I
More clues leading to the result LEYLANDII
- Tall trees in line upon line — and two further
- Hedging material in line daily becoming wilder
- What’s often used for boundaries, ideally in taking on new layout
- Fast-growing trees, ideally spread across end of garden facing one
- Earl finally – finally! – has estate ringed by 52 hedges
- Fast-growing conifers ideally spread round end of garden facing one
- Giant in dispute with neighbour idly playing with alien
- Natural sunblock ideally in jars
- Tree ideally in ground
- Fast-growing tree ideally in ground
Buddy explains!
The straight part
We know that "Tall trees" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tall trees = leylandii.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 LEYLANDII mean?
LEYLANDII noun- Leyland cypress, especially when part of a large hedge.