So no solenoid valves, or at least, not one for every plant. I always base my price on where I shopped last. In this case, I got a dozen at Archie McPhee’s on the cheap. So no. I’m not going $5 a plant just for a valve.
I’m seeing a gantry system in my future. I also see a mobile sensor package, verifying moisture, looking for shade or got shots. Probably strap a PiNoir on. I should also build for the future in case I want pH testing.