Forget soaker hose, not enough pressure. So I landed up making collars (one per tree) of 12mm polypropylene garden hose, each being a ring with a single feeder point. The idea being that the size of the collar (about 1m) and the spacing between the 6 holes would about be capillary distance. Then tune the size of the holes in each collar such that they were even (about 1.5mm).
The thing that did surprise me was friction. It’s very evident at low pressure so, in order to give each collar about the same flow, all the tubes to the trees are going to be the same length. A nuisance but there we are.
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