John, good to see some life on the ol' forum.
Living in the midst of pelargonium country, with nary an Erodium to be seen (except for weedy species); I, as a perverse human, have decided to look at the latter. Being autumn = fall here, it is finally cool enough, except for yesterday when it was 46 deg C in the greenhouse, to put in the Erodium seed - actually I did that on April Fool's Day - and a few are already up, including a very good showing of E. trifolium (E. hymenodes).
I am keen to grow E.telavivense - but I seem to have little luck. Last year I planted one of the 2 seeds I had received, which failed to germinate. I have now planted the other seed, which germinated, but the cotyledons are seriously deformed and will not expand; and I planted 2 of the seeds I received this year, one germinating and then damping off. Both of these seeds emerged 3 days after planting - the first to come up.
My Erodium collection is nevertheless slowly growing.
Cape Peninsula, RSA.