I have a couple drip zones where there are multiple plant types. One has a couple conifers, some shrubs and perennials. The other has conifers, shrubs, perennials, groundcover and some scattered annuals. They are in full sun. The soil is for the most part clay with the first couple inches of topsoil clay loam. The drip is .5 in/hr running throughout the zone.
Right now, I have the zone type set to shrubs to water at least deep enough for those. It watered deep, but it seems to not water often enough for the perennials and annuals before the top part of soil gets dry. I turned the crop coefficient up to have it water more often, but I worry about watering too often because I know it is not good for the trees.
I am willing to take the annuals out of the equation as I can hand water those as necessary, but what is the best way to have perennials, shrubs, perennial ground cover, and trees coexist in the same drip zone?