such gardens are not made / By singing:-" Oh, how beautiful," and sitting in the shade
The Glory of the Garden
Our England is a garden, and such gardens are not made
By singing:-" Oh, how beautiful," and sitting in the shade
While better men than we go out and start their working lives
At grubbing weeds from gravel-paths with broken dinner-knives.
There's not a pair of legs so thin, there's not a head so thick
There's not a hand so weak and white, nor yet a heart so sick
But it can find some needful job that's crying to be done,
For the Glory of the Garden glorifieth every one.
When the garden is planted the fun is not over, it has only just begun. But so has the work. The plants will grow, fill out the spaces allotted, and by and large thrive, if they have been properly chosen and are properly cared for. At risk of sounding brutal: there is no such thing as a no-maintenance garden. Even low-maintenance is bordering on fictional, in the early days. Gardens need to be kept weed-free and correctly watered if they are going to establish properly, and it's unreasonable to expect otherwise.
How much or how little maintenance can be devoted to a garden depends on how much the client is interest in doing, or if there is going to be a gardener on site or for periodic maintenance. Always consider that a garden is a considerable investment, and the way to protect it, is to tend it, or set aside an annual budget for its upkeep. Even a garden designed to be drought-tolerant and low maintenance in the long term may require, in the short term, watering-in until established, seasonal pruning, and occasional replacement of plants after a few years.