You can spray seeds with a solution of beneficial microbes by using an atomizer. If you do not have an atomizer, you can buy one online. You can use a spray bottle, but you will need to shake it well before you use it. You can use a spray bottle without shaking, but you will need to shake it well to ensure that the solution is mixed evenly throughout the bottle. How to Inoculate Your Green Beans with Liquid Kelp Extract You can soak seeds in a solution of beneficial microbes by using kelp extract. You can purchase liquid kelp extract online and at some garden centers.