15 Plant grow, what do I need?

Can anyone tell me what i will need to make enough organic soil for 15 plants. I have $400 to spend on all the soil for 15 plants. This will be an outside grow and the plants will be planted strait into the ground and not into pots.

Anyone?

you might try doing some searches. there's prob. a recipe here somewhere.

Silky Shagsalot said:

you might try doing some searches. there's prob. a recipe here somewhere.

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I know what to get, I dont know how much to get -_-

^^^like i said above.^^^