This section is from the book "Manual Of Gardening", by L. H. Bailey. Also available from Amazon: Manual of Gardening.
What are commonly known as geraniums are, strictly speaking, pelargoniums. (See Pelargonium).
The true geraniums are mostly hardy perennials, and therefore should not be confounded with the tender pelargoniums. Geraniums are worthy a place in a border. They may be transplanted early in the spring, setting them 2 ft. apart. Height 10 to 12 in. The common wild cranesbill (Geranium maculatum) improves under cultivation, and is an attractive plant when it stands in front of taller foliage.
 
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