As for cost I believe it is right around 5 or 6 an acre depending on how thick you plant. Don't quote me on that. The formulation that has a 80/20 mix of talc and graphite is made for the planter box. Something like a scoop per box and then use an auger on the cordless drill and mix it in. We get everything in 50 unit pro-boxes so a few weeks before we plant everything comes out of the box and we run it thru the gravity wagon cup auger and put it right back into the box treated. That way when a guy fills our central-fill planter he doesn't have to worry about anything.