Literally not but a few minutes after posting this project, I started getting wacky readings from my soil sensor while going through the watering process. Upon further examination, apparently water and electronics don't get along well together; who knew!?

After using a heat gun to dry everything out and verify that I was still getting reasonable readings, I found some larger heat shrink tubing that I had forgotten about and added this, along with some electrical tape to hopefully seal it all up. I could have used heat shrink for all of it, but alas, I didn't add the necessary pieces to my wiring before soldering up the larger connectors. When the sensor finally fails (hopefully not for a while), I'll make sure to do a better job with planning this part out.