It’s that time of the year.  It’s time to dispose your Christmas Trees, Wreaths and Kadomatsu as well.  The Kadomatsu is a little tricky. It was sort of temporary housing for the toshigami (god), so it is not exactly good luck to keep them around after the first week of January.  Don’t reuse them for pencil or nail holders.  Don’t try to paint them green and reuse them for other craft. Place it in a paper bag and sprinkle it with salt, then dipose it with the green waste can serve as an modern alternative to burning it. 

http://the.honoluluadvertiser.com/2001/Jan/11/111islandlife15.html