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From Birds & Blooms reader Jane Bullard Horn: "Red geraniums with blue Lobelia flowing all around,beautiful together." (Photo by Goby 1 via Flickr)

from eBay

40 Geranium Caliente Deep Red Live Plants Plugs Gardens Home Planters 250 A

Add more red geraniums around the backyard and repot three white geraniums from front yard and move to the backyard.

This is definitely maximizing space, and it's splendid to look at. Every architectural element is used to "create" a garden. (this is in Italy).