If you prefer to read, here’s an article: https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1911-2021.pdf
If you prefer to read, here’s an article: https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1911-2021.pdf
I set up ollas in my raised garden beds for this year and I can say they have been very useful for me and have contributed to helping keep my tomatoes alive in spite of my life-schedule.