Square semi-hydro pots? Source?

[IngieBee]

Originally Posted by wormpicker

Thanks for that tip. I was thinking about poking the holes with a soldering iron (that’s what we call them). Good to know that wasn’t a crackpot (no pun intended) idea.

Just thinking, I wouldn't want my soldering iron covered in plastic mess, and Ms. Orchid Girl on youtube has often commented how she uses heated nails to do the job, so maybe that's a good idea for you as well?