@John D. I apologize for the delay in posting a response.
I'll reply generally. There's a certain amount of flux in this market, and any specific program can change. Because of that I don't want to post what could seem like an endorsement of a particular program or wholesaler on a public forum.
The Washington regulatory structure requires licensees to carry General Liability and Products Liability coverage, and there are three competing coverage forms out there. The most prevalent is written on Lloyds paper through any number of wholesalers, each with a different set of program and brokers' fees, as well as varying minimum premiums.
The coverage is pretty standard with some notable exclusions, the biggest being some kind of health hazard exclusion. Those exclusions can be very broad, or they can be limited to the smoking hazard, but there's something there in every policy. (I feel that hazard will be refined going forward as the increasing prevalence of MMJ and the experiments in WA and CO enable us to gain more hard data about the health benefits and hazards.)
Landlords who rent to cannabis companies should make sure that the tenant is carrying General Liability at least. I notice more and more landlords also requiring $1M in auto coverage, and I would encourage any landlord to follow suit.
Outside of Washington, the same coverage is available for basically all types of cannabis companies - the recreational industry in Colorado, of course, and medical marijuana growers, processors, and dispensaries from sea to shining sea, as long as they're in compliance with state laws and regulations.
Property coverage for a cannabis business is more expensive than it is for other businesses, but I wouldn't try to hide the tenancy from my insurance company even if I wasn't an agent. In fact, it can work well for the landlord and tenant to work on the insurance coverage together: that way the landlord knows coverage is in place, and the tenant knows that the price tag isn't just a play by the landlord to grab an extra couple bucks.
There's also coverage for plants, stock, commercial auto, employee benefits - everything a growing, professional business needs.
I have seen subtle rating differences between medical and recreational, with slightly better rates for recreational here in WA. I think that may have something to do with the intense security burden recreational growers, processors, and retailers have to bear. Products liability on medibles can get pretty high, depending on what the product is and some other factors.
The biggest challenge isn't finding coverage; it's compliance with all the program requirements. That's a function of the evolution of the industry from black to gray to...green?...markets. Because of that trajectory, many cannabis businesses are build on work-arounds rather than being built from the ground up on best practices. Sometimes we have to take the business model apart and rebuild it to effectively limit liability potential and make the risk acceptable.
I hope this is helpful.