I usually don't grow in the summer due to the heat and I'm struggling to get my ass in gear for this winter. I usually have about 4 varieties I grow, blue oysters, pinks, lion's mane and pioppinos.
I can't post pics at the moment for fear of doxing myself. Just imagine poorly drawn flower pots.
You can drill holes or cut slits when they clay is leather hard before the initial fire. After that, it would be similar to trying to drill into glass.
Another issue is that clay shrinks during the firing process as it loses water so you might have to shape the corks.