Cold temperatures, sometimes getting too dry, but more likely the low temperatures we were having up till Wednesday.

Are we talking about proper perennial geraniums here ?
If so some of my geraniums get orangey coloured leaves and it's normal as they age.
G macrorrhizum in particular i'm thinking about now.

Ah, you know, it never crossed my mind, I assumed pelargonium geraniums because one or two of mine have developed orangy red leaves too...

Ah !!!
We'll have to wait and see what Chrissi comes back with !!!

Snap! A lot of my pelargonium geraniums have developed orangey-red leaves this week too...I am presuming that I just remove them...as I've always done? There is a biting cold wind today, Bamboo!

May was not a great month - my bedding went out by mid May, Geraniums being pretty hardy really, but the cool, windy conditions were not ideal for summer bedding. I nipped off the affected leaves, Izzy.