This 4 acre nursery has been growing and selling mostly native plants since 1986. Prior to that, the property was a ranch and stable, and you can still see that in the structures that remain and the style of the the hardscape that has been added over time. Limestone and cedar dominate the pallette as they tend to in central Texas ranches where those have historically been the materials at-hand. The stone walls and steps all have thick over grout joints that give them an older look.
Most of the garden structures like your pergolas, fences, etc. incorporate either smaller bark-on cedar posts or stripped cedar milling logs. The larger logs really have some nice character to them that's much more interesting than a standard processed wood post you'd get at a hardware store.
Back in the shade tree area they have used some 9" diameter treated posts with a tension wire between to provide support for the young trees as well as a path for the drip irrigation line to feed to each container.
The over grout limestone is found in the water features as well. There's a series of three square water ponds that are about 20'x20' each and raised up 12" above grade. There's a three inch interior lip thickness of limestone and then some type of polyethylene liner tucked below that with a water depth of roughly 20". Two of the ponds have water lilies (as well as turtles, fish and frogs), and one of them is more staging for the other water garden container plants they sell like horsetail, iris, etc.
There's one more water feature close to the main shop entry that I didn't notice the first six times I was at the nursery. It's like a little oasis tucked in a bunch of palms and other vegetation.
