plant order

NOUN
11 LETTERS · STARTS WITH P

plant order is a valid 11-letter word worth 13 points in Scrabble and 16 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3L1A1N1T1O1R1D2E1R1
3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 1 =13 PTS
DOUBLE WORD → 26TRIPLE WORD → 39
MEANING

What does plant order mean?