I purchased this systems to water 2 half barrels with roses and herbs, plus a large planter (3.5 feet high by 3.5 feet deep by 7 feet long). It's kept them appropriately watered once we figured out how to equalize the water pressure. Initially, the main hose bringing water into the system was not centered between the heads. We had a T-joint and saw that the arm of the side with more heads didn't get water all the way to the end. It was easy to correct the system, but it's important to note the water pressure regulator REALLY lowers the pressure so if any part of the system goes up, there should be a lot fewer heads on that arm because of the lower pressure.