Just give them time,if they've only been in a couple of years it will take awhile,just keep trimming them to the shape you want and they will eventually fill in.I have some I planted 9 years ago that are just now getting filled in where you can't see through them.Also the more you water them the faster they grow.

I am new to Tucson, so am fairly ignorant regarding southwestern gardening.- planted petite oleanders near the curb in front, in Jan., and they looked half dead by April. Did not water enough.Watered twice a day, and they are blooming and look okay. Same with 2 small fan palms. Need tons of water when planted.
Have a vine in back I thought was cat,s claw, but it has smallish white,round flowers - what is this vine, and how is it propagated? - want to put it by the alley, to hide the view.
Any information on this or any suitable vine would be greatly appreciated.