Q.Same Question. White Spots On Dark Red And Indoor Primula( Not Primrose) Flowers Not Leaves.
The flowers do look like someone splashed bleach on them. Could it be a fertilizer problem? This question was asked by another person but the answer was not helpful.
Certified GKH Gardening Expert
It could be! Unfortunately, without images it would be hard to say. Other reasons could include powdery mildew, Cercosporella primulae, the start of Botrytis (though less likely in my opinion) or a number of nutrient deficiencies. With some images, I can get a better idea of what is going on.
In the meantime, this collection of articles can help: