Thanks for sharing the details. Your code is much simpler than mine. I'm a programmer by trade and obviously I've over complicated my version (ha ha). I tried to do it without any delay() calls so I could add other things for it to do later without messing up the timing of the water. I'll post my code once I get it behaving.
So it looks like you are driving a 5V DC relay switching 110V AC? Is that a transistor I see on the breadboard or are you driving the relay directly from an output?
I liked your solution of a drip loop around the plants instead of directing the entire flow of the pump into the plants. I guess it would have been fine either way, since overflow from the plants will return to the reservoir anyway.