I didn't think there would be an issue, just wanted to double check before I did something stupid lol.

Are you using nutrients?

No, unfortunately I'm not. I don't really know enough about all of that side of growing yet to feel confident in using any sort of nutrients or anything like that.

I did add a couple finger pinches of organic fertilizer when I mixed up the substrate to fill the top of the original planters, but other than that I haven't used anything on them.

What nutrients would you recommend, and for learning purposes, why? :)