Walls look ok, but up against the wood walls they fall short. To bad there wasn't a fence there or a line of cedars to hide the neighbours mess. Gravel is a cheap way out, most people are only interested in one thing (up here anyway) in saving money and not having to maintain anything. But this is not always the case, river washed stone or whatever you guys call it there "gravel" does allow weeds to penetrate and they will, even with these so called weed barriers. It can be a real mess. I've seen it cause we have installed a lot of it in the past. Now if we are asked I'll give them other options. So that being said I think perennials are a great way to go, it just scares people cause they think they have the added chore of maintaining it.