Considering columnar conifers
I would like to introduce a few conifers into my garden for design reasons. I am thinking of them as exclamation points. I'm particularly looking for ones that won't get too big too quickly. Dwarf forms that would end up around 8-12 feet at maturity might work well.
I have my garden zoned by water requirements. One area is watered weekly, another is watered every third week, and in the last area, plants are not watered at all once they are established. Ideally I would like cultivars that would do well in all three environments. I don't need them to be the same one.
My soil is a sandy clay on a limestone base. We get an average of 15" of rain a year, none of it in the summer, and with California's typical wide variation. We're going to be lucky to get 4" this year.