The most common and most likely answer to this crossword clue is the 6 letter word DAIKON
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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 = daikon.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 DAIKON mean?
DAIKON noun- An East Asian cultivar or subspecies of radish (Raphanus raphanistrum subsp. sativus, syn. Raphanus sativus) bearing a large, white, carrot-shaped taproot consumed throughout East and South Asia but grown in North America primarily as a fallow crop for its fast-growing leaves (used as animal fodder) and as a soil ripper.
- Closely-related cultivars such as the enormous turnip-shaped Sakurajima or green-and-red watermelon radish.