Sand Box Propagation Bed

I am learning and expanding my growing capabilities in preparation for retirement
I am currently building a sand box plant propagation bed that will have overhead irrigation spray heads that can turn on every 10 minutes for as 5/10 seconds during the day light hours.
This is a North Alabama (Zone 7A/B) which has hot humid summers and early springs with late frosts.
Want to be growing perennials like fruits and vegetables that do not require chemicals to succeed.
What shade cloth should I use (50%)?
Does anyone have suggestions on what fruit / veggies grow well in a sand box like mine?
Would hardwood or softwood cuttings be best?


AHS edition, available used from many sources.