yes it is. I suggest especially if you are going organic, spending some time researching all of the different products and additives that work well for organic grows. Unless you already have a fantastic compost bin set up you will want a lot of different products throughout your grow. Some things to look into; earthworm castings, bat guano, sea kelp, soils, addititives like bloom, growth, rooting stimulators, mollases or sucanat, and nutrients of course, organic is a whole different monster from chemical growing, and with the right set up you can produce better tasting, possibly stronger plants with the same yields as chemical. It is the yield part that takes people a while to get down. Have a gander at the organics forum and keep in mind that when going organic the idea is to feed the soil not plants. It's all about keeping your good microbes alive and healthy and letting them feed your plants for you, getting the right nutrients ready for your plants to absorb them already broken down and ready to use. Good luck on everything let us know how it goes.
Edit: The reason to spend a lot of time researching is that a lot of companies put out products simply to make money and they are unnecessary, but there are a lot of fantastic products out there that really will help you with organics.