The beauty of these systems is their simplicity to DIY - especially for those who like to tinker with their landscaping by moving and adding shrubs and flowers. Unlike underground systems where pipes have to be dug up and retrenched to add or move a head, with the drip or micro system you just tap into the main line (which is above ground, but hidden under the mulch).
Because it is so easy to customize the spray heads, you can give each plant the amount of water that it needs. With underground systems the entire bed gets the same amount of water so plants that might need more don't get it unless you give those that need less too much. Of course, eventually the plants grow and block the outputs of the underground heads and then some get way too much and others get next to nothing.
I wish the builder had provided micro irrigation for all of the landscape beds rather than running underground pipes which invariably get dug into and broken as you try to move things around, plant new stuff or change the shape of the bed.
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