Square semi-hydro pots? Source?

[Ray]

If you get a drill bit intended for plastics, it's no issue.

I avoid melting due to the potential generation of toxic vapors.

[WaterWitchin]

Agree with Ray ^^ as far as vapor issue. Especially if you do a bunch of them. I use metal, wood, concrete drill bit. Because I have them. After all, it's plastic you're drilling into. Whatever you have will work.

[wormpicker]

I went with a round quart-size Ziploc cup (a little more than 4” diam, x ~5.75” high, which we happened to already have handy at home. I cut the holes with a Dremel with a conical grinder bit. Worked like a charm—nice smooth holes. Got my Hydroton all prepped, and tomorrow I’ll pot up my first trial plant, a Potinara that is putting out some nice new roots.

[wormpicker]

Crossing my fingers. 🤞🏻
My first attempts at:
1. S/H
2. Posting a photo (of #1)

[MermaidNat]

Good luck, and please share how s/h works out for you!

[wormpicker]

Thanks, I will.

[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?

[wormpicker]

Originally Posted by IngieBee

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?

Thanks. The Dremel with the conical grinding bit worked like a charm. Piece of cake.

[SallyO420]

If the plastic is thin I have just heated a large nail.

[Roberta]

Originally Posted by SallyO420

If the plastic is thin I have just heated a large nail.

Not only for semi-hydro drainage holes, but also holes for hangers, etc... I have a metal barbecue skewer, that I heat up with my blowtorch (the same one used for sterilizing tools) and poke the holes wherever I want them, Works on pretty much any thickness of plastic.