Material for printing flowerpots
I printed some pots for sprouting seedlings this year from PLA.  A square array of pots with tiny drainage holes in the bottom.

The array filled the bed of a Prusa3d i3m3.

The seeds sprouted, except for the ground cherries, which I think failed because the seeds were bad.  

I had good germination rates for tomatoes and basil.

According to the FDA, ABS is generally safe for food, although like any filament the pigment and any added chemicals may be contraindicated for continued health.