We have a gardening talk show here and I have heard the host say many times "dirt" is what you get under your fingernails. Our plants grow in "soil." I agree with the use of Alfalfa Pellets and any other good organic materials. Fall of 2010 I prepared a bed for iris seedlings adding my compost, some of the cities compost, lots of dry leaves, alfalfa pellets, and some bulb food. I planted the iris seedlings out in May and the second picture is in August. They loved the organic matter.