If refurbishing garden plantings, consider upgrading irrigation at the same time. New rotating sprinkler heads deliver water in a way that mimics rainfall; check with your local water agency for possible rebates on them. Run systems to check for leaks and whether plants have overgrown existing risers. Make the necessary fixes or replace these systems with more efficient drip irrigation that delivers water right to plant roots. New systems have reliable options to troublesome emitters that too readily clog.