wild plum tree

NOUN
14 LETTERS · STARTS WITH W

wild plum tree is a valid 14-letter word worth 20 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
W4I1L1D2P3L1U1M3T1R1E1E1
4 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 3 + 0 + 1 + 1 + 1 + 1 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does wild plum tree mean?