Guess no replies. OK

I've seen work done by Hill Country Rain Makers.
Otherwise, do a google search for landscaping services in Austin, TX.

Here is a link that might be useful: Hill Country Rain Makers

Ask Pam Penick at http://www.penick.net/digging/

She just has a ton of work done at her house and if you scroll down in her blog, you can see it.

Hi--Pam Penick definitely knows what she's doing. I also recommend yardfarm austin--I work for them as a garden designer and some time crew boss. We are currently building a 7-acre organic farm out by lake travis, but we do much smaller jobs, and plenty of no-nonsense ones, and I think we're affordable. Please feel free to email me at ox@austin.rr.com and I can talk to you more about this.
Robin Chotzinoff