That is one amazing idea. What seeds did he use?

GOOD JOB. I guess it would depend on the type of seeds. Many seeds damp off if their is compost that hasn't been sterilized? some want a straight mineral soil. Details deatails.

I use a mix of cheap topsoil, sand, compost(mulch) from the city, perlite and bonemeal. It drains well and works as well as potting mix. Those look like legumes. They need poor soil. I think modern hybrids would need more nutrition.

He used Alaska Peas. We chose this because 1) I had it on hand already, and 2) they had the fastest germination speed(about 7 days per the package) of any of the seed packs I had. The project had to be done start to finish in one month, so germination speed was important.