GrowCNanswered grow question 3 years ago Many greenhouses, grow stores and Amazon sell automatic plant watering systems. I have one that lets me select how many times a day it waters and how much it waters. It is powered by mains (AC) but also has battery backup in case the power goes out. The waterer came with tubing and fittings so you can water multiple plants. I water many sites around each plant depending on it's size so as much of the soil gets watered as possible.
I start out by measuring how much water I give my plants at each watering. Then I put the hose of my watering system into a container and let it run so I can see how much water it puts out. Then I adjust the watering schedule so the machine provides the same amount of water that I do. I sit the plants in large plastic containers (storage totes) on top of bricks so runoff can safely drain away from the plants.