Primroses changing colour?
A couple of days ago I rescued some primroses from the brink of death on a supermarket shelf. They'd not been watered and were flat as a pancake, but I knew from the summer drought that all they needed was a good drink and they'd be good as new. I was right, and they are now looking very happy on my windowsill (I will plant them out when digging a hole doesn't create a pond.)
They are nice colours with masses of flowers - orangey-red with yellow centres (like this), and white with pink or purple frills/veins on the edges of the petals, and the standard yellow centre (like this).
But now the new flowers buds are coming through I can see the new flowers are going to be different colours. The red flowers are coming through pure yellow or pale orange, and the purple edged flowers are coming through white... and I don't know why! Did the extreme drought they suffered knock them and they can't muster the energy to have multiple colours? Are they out of nutrients or cramped in their pots? Is it too warm on my windowsill? Am I being impatient and the flowers will change colour with age?
Any advice on this mystery is welcome! Thank you!