I have an irrigation zone that feeds a hedge of Varigated Pittosporums, Red
Robin Photinia, and some Oleanders. The irrigation lines are rubber hoses
on either side of the hedge roots. In observing these in action, the water
trickles out in random locations along the irrigation hoses, and the water
isn't really effectively concentrating in the roots of each plant.

My questions a

1) Does it make any sense to add a loop around the base of each hedge, to
concentrate water directly onto each plant's roots?

2) Do any of these three species require proportionately more water than the
others, maybe arguing for an irrigation loop around the base of just that
species?

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W