What does the cryptic crossword clue "Plant for southern border (5)" mean?

The definition is "Plant". The wordplay uses a charade (building blocks). S (synonym of "southern") + EDGE (synonym of "border"); definition: "Plant" The answer is SEDGE.

Plant for southern border (5)

Guardian Cryptic #24752 | 16 Down | 2009-07-15 flower

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