How have my geums changed colour??

[sesquipedalia]

I planted them last year. Lovely show of yellow flowers. They're just coming out now abs they're red...!! How??!!

*and

Mine have done the same. No idea why.

Maybe you have both kinds and the reds flower first

I've definitely never bought any red ones! I wonder if the weather has had an impact?

Glad it's not just me though!!

Is it the soil pH? I don't know if it's relevant to geums but it is some plants

How very strange.

Mine are all new this year. The orange one is orange, the red one (Mrs Bradshaw) is covered in red buds just coming out, but the bright yellow Lady Stratheden looks as though it's a pale primrose, not the bright, strong yellow I was expecting.

@DareIask

Is it the soil pH? I don't know if it's relevant to geums but it is some plants

The plant colours that react to pH are the purple/blue ones like the anthocyanins, not the bright pure reds of geums

The plant colours that react to pH are the purple/blue ones like the anthocyanins, not the bright pure reds of geums

And for hydrangeas, it's aluminium that matters; the acidity is necessary to make it available to the plant.

I wonder if there is any other cool plant chemistry requiring specific elements to determine colour?

And for hydrangeas, it's aluminium that matters; the acidity is necessary to make it available to the plant. Ah, thanks! That's why it's counter to the normal colours - hydrangeas are blue in acid soils and pink in alkaline.

How interesting. Geums are so pretty. Googling yields no results so very mysterious.
Very unlikely but is it possible that the red plants are new ones growing from seed dropped by the previous year's flowers? They would be different to the parent as they will have been pollinated by another plant and the red could be dominant. I don't know if this is how geums propagate to be honest but I know other plants do this.
All probably not right but I'm intrigued now!

Fascinating! The original plants were Lady Strathern. She might have dropped some cheeky seeds from last year I suppose, but the plants flowering red look really established! Magic...

Sorry, had to reply to this even though I don't have any geraniums (temporary rented property, will have a small garden when we move).
Anyway, in "active", without seeing the category, I saw the headline about someone having their GUMS changing colour, and I was intrigued, especially as I am having problems with my teeth at the moment!

I wonder if it’s weather related, a number of trees in our area are displaying their autumn reds since coming into leaf

It’s quite bizarre but beautiful to see and as these all change colour due to the anthocyanins @ErrolTheDragon mentioned above it could be related to the very low temperature through into late spring