I have a number of tall (30’-40’) old pine trees growing on my property, on a pretty steep slope. My soil (Southern California) is supposed to be sandy loam. This particular area seems to be quite compacted. The previous owner used to water them using fixed full circle sprinklers. I’m starting to wonder though, if I need to be watering them at all. Given their size and how extensive their root system must be, how much effect will a sprinkler have anyway? And if I do need to continue watering them, how do I do it effectively and without bankrupting myself?
My long-term plan is to replace them with green giant arborvitae because they are too close to the house.