First, I need to clarify that I'm not talking about the bright red/pink/white annual geraniums that many people grow in window boxes and containers. Those are actually pelargoniums. True geraniums—sometimes referred to as hardy geraniums or cranesbill geraniums—are generally perennial, have divided leaves rather than scalloped ones, and are typically pastel in color.
The first geranium I ever tried was 'Johnson's Blue', and although it didn't bloom nearly as long as the catalog said it would, I just loved it. The plant had a very round form, like a big green basketball, and very pretty blue flowers in May/June. It did get a little scraggly after the flowers were spent, but once I cut back the stems, it resumed its nice shape.
At a different house, I tried Geranium sanguineum 'Striatum', which had a pink flower. It was a much smaller plant than the 'Johnson's Blue', and behaved more like a ground cover, sprawling along the edge of the bed.
I didn't even realize it was possible to grow geraniums from seed until I met my husband, who had discovered 'Splish Splash' in a Park Seed catalog. (They no longer carry them.) The plants were still fairly small when we moved, so I don't know what form they eventually took when they got established, but they, too, seemed more like a ground cover than a specimen plant. Their flowers were white with lavender splashes (or lavender with white splashes, depending on your perspective).
When we lived in New York, we tried a new variety, 'Jolly Bee'. Like 'Johnson's Blue', 'Jolly Bee' had a pretty blue flower. I can't tell you much about the plant's form, though, because we abused it so badly! We didn't mean to! The portion of the garden where it grew had a horrible infestation of bamboo, one of the nastiest invasives I've ever seen. It spreads via runners deep under the ground, and in digging up the bamboo, my husband sometimes accidentally dug up the 'Jolly Bee'. I would be sweeping up the remnants of our weeding activities, find the poor plant in the heap, and then pop it back in the ground. It did rather well, given its circumstances!

Here in Ohio, we grow two varieties of geranium. One of them, 'Victor Reiter, Jr.', is just now starting to leaf out.

'Victor Reiter, Jr.' isn't as large and shapely as 'Johnson's Blue', but it does have a more compact, upright form than the creeping geraniums. Its leaves are more bronze than green (at least initially), and it holds its lavender blue flowers above its leaves on long stems (long for a geranium, that is) from late May to late June, with a sparse second flush later in the summer.
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It doesn't seem to be quite as hardy as some of the other geraniums I've grown—I planted five, and one died the first season—but it does appear to self-seed. I discovered a baby on the other side of the stone path last year, and this spring I moved it back in with its relatives, replacing the plant that died.
But the glory of the garden, my very favorite geranium ever, is 'Rozanne'. Indeed, I'm a little nervous at the moment, since my two plants have not yet shown any new green growth, but I will be shocked—shocked!—if this plant doesn't make it. It's a very vigorous grower, spreading two to three feet each season while still maintaining some fullness, and once it starts flowering in late May, it keeps going and going until a good, hard frost in the fall.
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In these pictures, the flowers look pink, but it's just the the way the sun is hitting them— they're actually lavender blue. Rozanne is among my most treasured plants. It requires absolutely no maintenance (other than being cut back in the fall), and it blooms extravagantly.