This is one of the more traditional perennials for old fashioned window boxes, not only because it cascades downward to avoid obstructing associated windows, but also because, back before window screens were commonly available, the aromatic foliage was purported to repel mosquitoes. Ivy geranium, Pelargonium peltatum, is splendid for hanging pots and retaining walls as well.
The best bloom is usually later in summer or in early autumn, but sporadic bloom can continue almost throughout the year. The flowers are very similar to those of more common zonal geranium, but perhaps more abundant. The slightly more extensive color range goes beyond hues of white, pink, red and peach, to include rich burgundy, pinkish lavender and candy striped red with white.
The rounded and lobed light green leaves are rather succulent, so are easily damaged. Some cultivars have slight foliar halos (semicircular zones of darker color around the centers of the leaves) almost like those of zonal geraniums, but not quite as prominent. The thin and nearly succulent stems are easy to root as cuttings. Although fragile, they can sprawl or cascade as much as six feet.
Tony Tomeo 
So beautiful 🌸
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Thank you. It is not mine.
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Would this plant do well in our Houston heat? What about direct sunlight? I’m thinking I could give it plenty of indirect light until about 2 p.m. or so, and then move it back into my balcony’s shade if it doesn’t like the harsh afternoon sun.
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It would probably be happier there than it is here just because of the humidity. The heat is only a problem here because of the aridity. A local horticulturist would know better. Also, someone in a nursery would know of they are happy there. They would not like the colder frosts though. Even here, they can get frosted if too exposed in winter.
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Now that I have your opinion, I’ll explore a little further.
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I like them. I tend to forget about them.
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They are more popular there because of the window boxes.
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Oh, I am sorry. I thought I was responding to someone else. You are probably wondering why there would be any less window boxes here than there are there.
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