Some but not all of of the many succulent plants known as ‘hen and chicks’ are varieties of Echeveria. Likewise, some but certainly not all Echeveria are known as ‘hen and chicks’. Echeveria are so variable that many do not seem to be related, although all have dense rosettes of succulent leaves. Some have very narrow leaves like miniature yuccas. Others have warty broad leaves. Foliage can be simple green, yellowish, bluish, gray, bronze, bronzy purple or variegated. The edges and tips of leaves of many varieties are blushed with red or purple that is more colorful in winter, or with complete sun exposure. Most Echeveria will tolerate light shade. Propagation is very easy from division of pups, stem cuttings and even leaf cuttings.
Tony Tomeo 
Echeveria are great. My front garden uses Blue Rose Echeveria as border edging on the garden beds. The grey minors like the nectar of the flowers. They are very hardy. Given space, one can grow to dinner plate size. Enjoyed your blog on them.
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Blue Rose echeveria lives in some situations in our landscapes; not on a large scale, but plugged into empty corners or among boulders. It is good for that sort of application. It it gets removed as other plant material fills in, it simply gets recycled somewhere else. I give quite a bit of it away to neighbors. I thought it was sort of old fashioned though. Is Mexican snowball more popular nowadays?
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Mexican Snowball is available in nurseries here. Succulents, so many and varied, are on offer. The Blue Rose Echeveria is the one I happened to have years ago and just kept developing it as borders.
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That is how some of them work. The most vigorous and prolific stay around forever. My aeoniums grew from two bits that rode around on the dashboard for months before I finally plugged them into a planter box. They grew fast and big, and are now all over town.
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