You could, depending on how good your soil is. If you have a well balanced nutrient load in your soil you can grow many different plants, close together, without one "stealing" nutrients the others would need. In addition the clover would, if innoculated, produce Nitrogen for future use.

From what I've read, there are usually problems with getting old produce at the grocery store - something about liability of giving away spoiled produce? I am making large new gardens in the back yard where I've had some trees removed, using the lasagne method. I started in Fall '06. First I lay down large sheets of cardboard (all plastic labels and tape removed) a layer or two. Then I spread about 1-2 inches of coffee grounds (with filters) I collect from the local convenience mart. I am still collecting these even with the snow, just piling the grounds in one spot and will spread them when the snow melts. After cardboard and coffee grounds, I then spread leaves and grass clippings - collected at the town composting site or the side of the road. I actually have over 30 bags sitting out there waiting to be used. On top of that goes anything - old pumpkins, debris from the garden, compost, weeds I've pulled (hopefully no seeds), ornamental grass clippings - anything! My lasagne beds are only about 6 inches deep - I have pretty good soil underneath already. But with the cardboard they are very effective at smothering and killing the Vinca minor and many other invasive weeds underneath - and adding lots of organic matter to the bed! Most of the work is lugging the materials around. To mix them up and make sure water penetrates, I usually turn over the beds a little using a garden fork after the weeds are killed, but they are easy to turn. I create the beds from Spring through Fall - and will plant them the following Spring. So I usually wait at least 6 months to plant, because I'm smothering weeds and prefer the cardboard and coffee grounds to be broken down. But you can make the beds anytime of the year and some people plant in them much sooner than that too.

1. Yes, and it gets complicated trying to explain the differences between Nitrates and Nitrites. In a good, healthy soil the Soil Food Web, the soil microbes, change the various types of Nitrogen into what they plants can use and in many instances the plants are "fed" that N by some types of fungi. Some forms of Nitrogen are more readily available than others, more soluble, and are therefore more susceptible to leaching from the soil and polluting your groundwater. 2. Whether the N in an animal manure is more soluble or not depends on the form it is in. Poultry manure and horse manure have very readily available forms of N and so are "hot" while cattle, sheep, and goat manures are more stable and are considered "cold". All animal manures should be composted before being put in the garden, fresh manure should not be put on a garden plot, especially if food is being grown there. 3. Poultry and horse manures have very readily available forms of N and that availability is what makes them "hot".

I like to grow a mix of legumes for nitrogen and grains for carbon, as well as buckwheat and phacelia for the insects. I don't grow it if it isn't cheap though, is this seed? Can't see why not plant, if price and climate are right!