I would think so. Use a masonry bit. Maybe put tape on both sides where you are drilling the hole to prevent chipping. Start with a small hole (like 1/16") then increase from there a little at a time.
If it breaks it's your fault.
Also: This has fuck all to do with carpentry.
Really helpful.Soak pot over night, tape over where you plan to drill, use masonry bit. Start with a smaller bit and work up
I 'm going to start growing herbs this weekend. I have the pots already but didn't have a clue how to put holes in the bottom.