Fall is for

 CHESTNUTS

Chestnut trees line the streets of Paris  

In late September, early October they fall from the trees, out of their spiny casings, the color of rich warm wood. 

You can have crêpes filled with the crème de chataîgne, a floury, sweet-tasting goo.  

And for Christmas - instead of flowers, you offer your host marrons glaçé.  Sugared Chestnuts.  
A very traditional Christmas treat.