Sub irrigated planters are another option. They’re equally effective, but they take the human error factor of setting and adjusting watering rates out of the equation.

This is the site I used to make mine and it turned out well:

https://albopepper.com/sips.php

Note that he says not to put perennial plants in it. This may be true for areas that get a very deep freeze, but my perennials did great in zone 8.