Drip is a staple here in the desert, and on Xeriscape landscapes I have no problem with it but on some of my older estate homes that are densely planted I am having big problems. As the plants mature they pinch off the poly, both 1/4" spaghetti lines and the 1/2" supply lines. Az landscapes are not all that old so a 10-15 yr old estate is an old system. We have much older homes but the intensive landscapes like in the south east are relatively new. We have spent most of the summer band-aiding some 10-12 year old systems and it is just that. Patch and re route and wait for the next section to go brown. The plantings are so dense I have not been able to see an emitter or tube for years so you don't know its pinched off until stuff is stressed. I am trying to come up with an alternative. In the more rural desert where rodents are a problem we hard pipe the drip systems. Trying to do a retrofit hard-piping new drip would destroy the plantings. Overhead sprays are not an option because of the supply lines to the beds are poly and would not handle the pressure needed. Come to think of it they too will eventually get pinched off most likely. I'm screwed I don't see a simple solution, any one got any Ideas or a better long term experience with drip?