Very nice. I have a simpler setup for outdoor plants in pots. Solar powered so using as little as possible power. I gave up on relays very early on as they consume even when not on. I went for Mosfets to switch on the pumps.
I found these submersable pumps didn’t last very long (rusted). So far mostly going with self priming diaphram pumps at 5 volts. I don’t mind if it takes 2-3 mins to drip water.
I use black pipes to avoid algae build up. My water source is similar level to plant pots but get caught out from time to time with that siphon effect. Water overflow isn’t a big as problem outside as in a house but i set a max turn on time in esphome in case HA looses connection.
I prefer to press a button to water my plants rather than set a schedule. That’s the gardener in me.
Mahko_Mahko uses a more horizontal water storage in his popular thread.
That solar panel is about 4 times the size needed once I got my power reduction measures. I do notice the irony of it raining in the picture.