How to make an Olla?
I heard that ollas can be a way to use less water in the garden by watering slowly at the root level. I can't find ollas here locally. How to build one and how far can an olla reach? I was thinking of using ollas in my containers instead of building a SIP. I use 18 gallon pots, so how big of a vessel would I need? How would I know when it is time to water again?