Like so many things--it depends. There's not an easy answer that always works.
What's your soil like?
Are these desert adapted plants?
Are they newly planted or mature? Somewhere in between?
Sun or shade?
I strongly suggest getting or making a soil probe.
Here's a link to some good local information for Maricopa County. I think the detailed answers you're looking for are in this booklet.
https://wateruseitwisely.com/s...
There is more information, including an online interactive guide, if you browse around that site.
