The most common and most likely answer to this crossword clue is the 9 letter word ROCKERIES
I've seen this crossword clue in Financial Times
R
O
C
K
E
R
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E
S
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The straight part
We know that "Garden features" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case garden features = rockeries.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 ROCKERIES mean?
ROCKERIES noun- A section of a garden made from decorative rocks and alpine plants.
- A natural area where many seals breed.