David, Sure will egg shells work but it could give the soil an amount of chalk which could harm some plants who prefer a soil with higher pH value, grapes love it but I don't know if peppers do. Maybe some with experience growing peppers in a soil with high chalk (lime?) rate can advice. Regards Rob PS. where would you get enough shells to cover your garden?, I do like eggs specially the hot ones according Indonesian recipe or Cajun stile. David wrote: Crushed egg shells work very well also!