suggestions requested

Greetings to the Collective Knowledge and Eager Help of Mediterranean Gardeners:
 
I am the Foothill Folsom Gardener who gets very hot summer temps. and very few freezes due to my hilltop, Sunset zone 9 location.  I need to replace a cluster of 5 Festuca glauca plants that I must move or lose.  For several years they have been struggling and gradually failing because of too much summer runoff water from the lawn's twice weekly watering and a nearby bed's once weekly watering on a different day.  It seems that it really would prefer a much drier summer space, and I have just the place for it where everything else I have put has died from too little summer water!  However, I need something very similar in size and form which can replace it.  It is fronting a low, rough rock bed border, so can't be too high, and since the space was just right for the Festuca, it needs to be no bigger than that 12-inch or so spread per plant.  Any suggestions that can take more summer water than Festuca?
 
Thanks a bunch,
Karrie Reid
Folsom Foothill Gardener
Sunset zone 9
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