I did the slurry method with some agaricus campestris. Once you have the first slurry done, you can spread some of it and add more water and sugar and salt to keep going. I got a week of watering with spore layden water on my mint garden and on a spot on the lawn. I’m seeing lots of mycelium in the mint garden, but I can see the issue that Martin speaks of. Most environments already have fungi establised. So what you spore must outcompete in order to have a chance of colonizing. So I would go overload on the applications.