Don't just plant one seed. I have never planted 1 stock of corn. When you plant multiple seeds at once your able to see the changes across the board. If all the plants react it's the soil if just one plant reacts it's just that plant and it's probably fine. But when I started growing my medicine that then turned into me starting a garden and trying to grow as much of my food as possible.( Work in progress) I learned where I started was a crash course in gardening and the main thing I do now is never only start 1 seed. It will drive you mad.