early winter cress

NOUN
18 LETTERS · STARTS WITH E

early winter cress is a valid 18-letter word worth 24 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
E1A1R1L1Y4W4I1N1T1E1R1C3R1E1S1S1
1 + 1 + 1 + 1 + 4 + 0 + 4 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does early winter cress mean?