What does the cryptic crossword clue "Tie up an exotic plant (7)" mean?

The definition is "plant". The wordplay uses an anagram. anagram of TIE + UP + AN = PETUNIA; definition: "plant" The answer is PETUNIA.

Tie up an exotic plant (7)

Daily Mail Cryptic #16975 | 19 Down | 2022-11-24 flower