Hi there,
I was concerned about the same thing myself. Using the same soil is OK I think.... However it is better if you make a soil mix. The mixture could be organic blend of bone meal, poultry manure, feather meal, poultry manure. That stuff, to be honest, smells a little funny but is really good for the soils and the plant that is to be seeded. I hope it helped.
Best,
Shannon
