I have SA in my south facing back yard. It was only laid on 1 March this year. I had a fairly stringent Potassium and Phosphorous fertilising regimen through April, may and the beginning of June along with the occasional urea (nitrogen) use also. I have managed to keep it relatively green for a newly laid santa ana. I'd say that just under 50% green at the moment. When ever there was a sunny day or two after a bit of rain I did hit it with some granulated urea for a quick green up (just before the rain as Urea will burn if not watered in) and I also would dissolve urea in water and spray the lawn with that mixture directly after mowing (don't have to water that in).

I think next winter, when the lawn is a little more established I'll be able to keep it fairly green (for Santa Ana in winter that is)

Here is my SA lawn a couple of nights ago straight after mowing add spraying with the Urea mixture. As you can see the lawn is still wet

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This is the brownest it has looked all winter. As you can see, it doesn't look the best, and I've cut it a bit low on the left side so it's a bit brown there, but all in all I don't think it's too bad for a 5 month old Santa Ana that has copped a fairly wet and cold Adelaide winter.