I put in 4 more hours. I've seen it spawn twice more, but still no cabbage. There is very little info about this mob online, but posts here circa 2005 seem to indicate the mob should not be this rare.
http://everquest.allakhazam.com/db/item.html?item=2789
Please keep in mind I have at least 4 spawns on lock down, and this zone has a 10 minute repop.