The most common and most likely answer to this crossword clue is the 10 letter word LEMONGRASS
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Buddy explains!
The straight part
We know that "Plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plant = lemongrass.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 LEMONGRASS mean?
LEMONGRASS noun- One of various species of grass of the genus Cymbopogon, especially Cymbopogon citratus, which have a lemon-like taste and aroma, and are used in cooking, for tea, and for fragrance.
- Sourgrass, Oxalis pes-caprae.