I am very pleased with the two Erodiums I bought at Perth a couple of weeks ago, E. chrysanthum and E. manescavii, both now planted out in a sunny and sheltered spot. I think of Erodium as a rock garden version of Geranium, but the two genera are very closely related, along with Pelargonium. Erodium should be just as hardy as Geranium though.
Geraniums are Cranesbills of course, whilst Erodiums are called Heronsbills and Pelargoniums Storksbills. Their English names describe the shape of their fruits apparently.
E. chrysanthum has silvery-grey leaves, with flowers of cream to pale yellow (which manage to avoid the colour combination I normally dislike, of grey and yellow). It is quite compact, and cushion forming, but does spread a little. Its geranium-like flowers grow in summer about 15cm high, but its leaves are not really like those of ordinary geraniums. chrysanthum is I hope a misnomer because it is Greek for gold-flowered, which is not what I am expecting.
E. manescavii is the other Erodium I got, much more like a miniature geranium, in leaf and flower. It’s a little bigger than E. chrysanthum, perhaps 20 cm high, less inclined to spread, but self-seeding freely.