Alright so I have one of those little containers with a hose that attaches in between the nozzle. It has markings on the side for tablespoons and gallons. It seems like 10 tablespoons corresponds to 10 gallons, etc. I have a lot of plants and don't want to water each one with a watering can to deliver the fertilizer, but I have no idea how to use one of these things to deliver the right concentration. Can someone help me or are these things just not a good idea?