Depending on just how much sand there is in your sandy soil, the initial process is as you describe, but the fastest way to get to where you can grow a truly diverse mix of seeds is by starting out with buckwheat in the summer and winter rye in the fall. Another key element is to introduce organic matter to your sand. I have found poultry litter, broadcast in the early spring, to be one of the best ways to achieve this. After 1 to 2 years of the buckwheat/winter rye program, you can start to see other things begin to grow reasonably well, like chicory or alsike clover. Throwing highly diverse seed mixes at REALLY sand soil, in year 1, doesn't work out well, in my experience. Maybe in some places, or with enough rainfall, it can work, but in the upper midwest I have found that sticking to just BW/WR is the way to get started.
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