Answer:

pumpkin

Answer	Crossword Clue
PUMPKIN	Symbol of fall.
PUMPKIN	Symbol of harvest time.
PUMPKIN	Seasonal symbol.

PUMPKIN	Symbol of Hallowe'en.
PUMPKIN	Peter, Peter's diet
PUMPKIN	It's carved in October

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.