Try All Risks (http://www.allrisks.com) at least I think that's right. They write a National Janitorial program with Everest.

We just got a flyer today for AG West Crop INsurance Service (888) 252-9797. Crop insurance specialist, flyer is for Nurseries as an alternative to Federal Crop Insurance.

Might be something else to consider.

I had similar problem (I'm in CA) and couldn't find a market to write. Progressive doesn't and none of the standard auto carriers will. If not registered or ridden on street, we could insure under inland marine and then by the GL for trade shows (which is where mostly used), but if registered and ri...