"Celery Stalks at Midnight" can be found in the DVD collection entitled "Avant-Garde: Experimental Cinema 1922-1954: Vol. 3"--a collection of very unusual films that probably would hold little interest to the average viewer.
The title refers to a big band song that is played in this film by Will Bradley and His Orchestra. As the song plays, you see shapes dance about the light blue screen. There is nothing more to this film than this--just shapes bouncing about set to nice music. I've seen other films like this before and while they are mildly interesting, there are an awful lot like it and when you've seen one, you've pretty much seen them all. Not bad--just not especially memorable.