For those of you who didn't read my first blog about composting, I'll tell you that my Grandma (the self-proclaimed "pioneer at heart") taught me how to garden. When my G-ma first told me that I had to dig my garden 2 feet deep, I thought she was crazy. Since I was pregnant at the time I started my garden, my grandparents brought over a truckload of their "special" dirt, dug 2 feet down throughout the length of my garden, and tilled the soil with a pitchfork. Grandma did this all herself with some small help from me. I don't think either of us could bend over very well at that point, but we managed to make it work. Even in the summer, I hardly had to water, I never had to fertilize (which you don't want to do in an organic garden), the garden was virtually pest-free, and my fruits and blooms were as plentiful and colorful as ever.
When it came time for me to build another garden (I always mixed my flowers and my veggies), I thought, "Eh, I bet I could get away with only digging down a foot," and that is what I did. Now, don't get me wrong, I still grew plenty of healthy flowers and veggies, but I watered more and I fought more pests. So, the next year, determined to make up for any gardening wrong-doings, I went to work digging and turning and mixing my garden soil--this time at at depth of 2 feet. Whoa! What a difference this made! The only main problem that I had was keeping my lawn from encroaching the garden soil (I eventually lost this battle). The soil was SO rich and healthy that only watered once a week (even in August), and enjoyed the benefits of a beautiful garden.
Now that you're a believer in the 2 foot rule, I'll tell you WHAT to amend your soil with. It's so easy...compost (either homemade or store bought) for nutrients and beneficials, peat moss to hold in moisture, cow or horse manure (I always get mine from grandma's farm, but the store-bought kind works just as well) for balanced nutrients, and top soil for volume. Follow the directions on the packages to know how much you'll need to cover your square footage. Remember that garden soils (etc) are sold by the cubic foot. That's length x width x height (or depth as is the case here) of your garden. Make sure you mix well with a pitch fork or tiller.
My grandma would always cover her garden with a thick layer of straw. This acts as mulch to insulate your plants. You'll water less with a good thick layer. Plus, if you're planting in Spring, it's root protection from those late frosts that Oklahoma is known for. It's also a great way to stave off weeds. Stay away from the "tree bark" mulches as they can carry fungus. In some cases, the fungi produces spores that can actually "stick" to your house and cause damage. Visit http://www.whyy.org/91FM/ybyg/ for more great gardening advice and mulching tips.
Lastly, I have a problem with weeds. I have a bigger problem with chemical weed control. There is an organic gardening company called "Gardens Alive" that makes a product for weed control in lawns. The product is actually corn gluten meal. Research has shown that corn gluten meal keeps ALL seeds from germinating. I will mix this in to my garden as well as a prophylactic weed control. The only down side to using this product is that I am unable to plant seeds in the garden as this product will also keep them from germinating.
Hopefully, this has answered all of your burning questions regarding amending the soil. If you can't use it this year, there's always next year!