What do you mean by "organic"? 
Organic gardening is a type of home agriculture in which the gardener uses only natural products (leaves, grass, manure, etc.) to sustain their plants. An organic gardener resists many modern agricultural techniques and products. These include: petroleum based fertilizers, herbicides, pesticides, and chemicals used to discourage diseases. Everything that an organic gardener uses to promote healthy plant growth comes directly from the earth.
Fundamentally, organic gardening is based on two concepts: 1)Organic gardening works through a partership with Nature, and 2)Organic gardening does not pollute, harm, or imbalance the environment. When these two concepts are elaborated, an organic gardening system quickly develops. To complete the first concept, the organic gardener observes natural processes (like decomposition or symbiosis) and recreates them in his or her garden. The organic gardener is constantly trying to apply natural techniques to his gardening purpose. By emulating natural processes (Concept One), the organic gardener unwittingly fulfills Concept Two - Do not harm or imbalance the environment. An organic gardener essentially recreates the processes of nature in his garden. He does not use anything artificial or unnatural because these things are, by definition, not produced in the natural world - an organic gardener only uses the materials of Nature. Therefore, the organic gardener becomes another part of the natural environment...he blends in to the surrounding ecosystem. The organic garden is simply another part of the natural world, and, therefore, does not cause any harm or imbalance.
Why should I go organic? 
I was raised in an age of environmental awareness. As a result of these influences I have always been aware of the environment and the efforts that we must take to keep it beautiful. In more recent years, however, I have discovered more intense motives for organic gardening techniques. First, there is a feeling of safety when you do not spray your plants with dangerous chemicals. It is comforting to know that nothing potentially harmful has gone into your plants, and that your vegetables are always safe to eat. Second, an organic vegetable gardener enjoys a feeling of environmental responsibility. This feeling is well deserved. By gardening organically, the irreparable environmental damage that occurs when chemicals come into contact with the local ecosystem is prevented. Because all the materials that an organic gardener uses are natural, there is no need to worry about contaminating the water supply, destroying beneficial organisms, or harming the plants in the garden. Rather than fighting nature, the organic gardener uses powerful natural forces to his or her benefit. As a result of this cooperative relationship, the gardener and the environment are both better off. But there is still more to be said for going organic. You will be amazed at the tremendous quality of the harvest. You have not tasted a real vegetable until you have eaten from a garden in which only 100% organic soil conditioners and garden-care products were used. The difference between a vegetable produced in an organic garden and a vegetable produced in a non-organic garden is indescribable. You have not truly grown vegetables until you have gardened organically. In short, organic gardening simply makes sense: through a partnership with nature, an organic gardener is far more efficient, productive, and environmentally safe than a non-organic gardener. So the question remains: Why not give organic gardening a try?