Sprinkler Daddy Says:
Drip irrigation or spray irrigation for shrubs and flower beds?
The Difference Between Drip Irrigation and Spray Irrigation for Flower Beds and Shrubs
Spray irrigation is great for large plantings of flowers or perennials. It covers a large area of space, but sometimes you can end up watering areas you don't need to. Blockage can also be a problem with spray irrigation because large shrubs can prevent the spray from reaching other smaller plants or shrubs. For the reasons listed, water waste can be an issue with spray irrigation if it's not used in the right situations.
Drip irrigation is great for watering shrubs because it is localized watering at the root of each shrub, meaning you aren't watering the areas that don't need it. Drip irrigation works great if you're planning to use mulch because you can lay the pipe without digging a trench and just cover it up with mulch. The downside to drip irrigation is that it isn't practical to use for large plantings of flowers or perennials.
So to recap...
Drip Irrigation Systems:
|Localized watering - less waste
|Difficult to water large areas
|Little trenching required if you're using mulch
Spray Irrigation Systems:
|Good for large plantings
|Prone to wasting water
|Subject to blockage