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Topiarius
This is true but how many Nurseries sell Natives that are not PBR?
Actually most commerically grown natives from the big PBR companies should be treated just like any other plant IMO and most do really well
I have seen Grevillea growing quite happy in high Phos potting mix (it at my mums house actually)
Grasstrees however are harvested from the wild and therefore have different needs