For plant-lovers, hedges may be preferable to fences as a means of defining a property. Hedges have the virtue of being "living walls." You can find out how to plant hedges in my step-by-step tutorial, with pictures.
If traditional, trimmed hedges are a bit too formal for your tastes, there's another option: living walls composed of plants more loosely grouped.
In the next landscaping picture we zero in on the landscaping closest to the house....


