Interesting @LG_. It flowers and thrives no problem in sun here. It won't be as hot or as persistently sunny here though, as it will be with you.
I have it (London Pride) in lots of locations, including pretty sunny. But the only times it has simply curled up its toes and died it was in a really baking hot, no shade at any point, south-facing bed. In a hot, dry summer. I watered it but it just bleached, then died. There's a bit more cover from other plants now than there was then, which might be enough - but the Erigeron and Lobularia love it and have taken over anyway so there's no space!
'If you have a garden and a library, you have everything you need.'
Geranium nodosum is more or less evergreen, flowers from now to well into the autumn, crawls gently through other planting and takes a good bit of dry shade happily. Personally I can't stand the smell of G. macrorrhizum!
@KayJ, I've bought the macrorrhizum 'Spessart' now (on a trip to a lovely but ramshackle nursery today for a spur of the moment browse, saw these hiding at the back and thought it was fate!), but thank you for this suggestion as well. It means when I'm next trying to decide on a geranium - which i can guarantee will happen - I'll know about nodosum too.
Can I ask which is the longest flower Geranium mac? This website says that this general mac "Flowers over a long period, from May to September." I don't know if that suggests it flowers continuously from May to Sept.
If you want semi-evergreen, Geranium mac. 'Whiteness' is very nice, it's a particularly neat and compact variety. Other than geraniums, Pachysandra terminalis would be a good shout, looks very nice planted in a mass. Perhaps with a couple of ferns dotted among it.
I found Pachysandra got eaten by slugs. 😱
An evergreen alternative that is fab as underplanting is Waldstenia Ternata. You get a few buttercup-like flowers, but mostly it is lovely leaves that look a bit like strawberry ones. It hugs the ground and is easy to keep in check. Happy in shade, even very dry shade once it has established a bit. No diseases afflict it, no pests attack it, and it is truly a doddle to propagate - just break off a leaf with a bit of runner attached, bury the runner in some compost in a small seed tray and wait a couple of weeks.
The only downside I have ever found is it does not like to grow in a pot, which is probably why you rarely see it in garden centres.
@Fire I've had various varieties of pink Geranium maccrorhizum in at least 3 gardens and they have only flowered in spring, never summer or autumn, including Bevan's variety which is mentioned in that link.
Dordogne and Norfolk. Clay in Dordogne, sandy in Norfolk.
For long flowering @Fire, G. Rozanne is the best geranium I've ever grown out of over 15 different varieties. It's happy in semi-shade and dislikes hot, afternoon sun in my dry sandy soil. It flowers from late spring to the first frosts, taking two to three years to reach its full flowering potential. I'm not sure how you would avoid it getting trampled though, like other geraniums, without protection.
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An evergreen alternative that is fab as underplanting is Waldstenia Ternata. You get a few buttercup-like flowers, but mostly it is lovely leaves that look a bit like strawberry ones. It hugs the ground and is easy to keep in check. Happy in shade, even very dry shade once it has established a bit. No diseases afflict it, no pests attack it, and it is truly a doddle to propagate - just break off a leaf with a bit of runner attached, bury the runner in some compost in a small seed tray and wait a couple of weeks.