Just because you have a small space, doesn't mean there aren't creative ways to make it "feel" bigger...One tip is to limit your plant choices. Masses of a handful of varieties, limiting to only a few colors, keeps the garden from appearing cluttered or cramped. Also, build in adequate and comfortable seating options. Built-in seating in corners can accommodate more people than a bunch of chairs, not to mention adds a more permanent feeling of interest. Lastly, adding an element such as fire or water features can create maximum impact on a small space.
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