Answer: I can't say for sure, but your plants may be suffering from a nutrient imbalance rather than a deficiency. If you are fertilizing, make sure it's a formula suited to blooming plants. Overfertilization with nitrogen has a negative effect on blooming. You may want to check with the nursery where you purchased your pelargoniums to see if they have had similar problems, and find out how they handled it. Hope this helps!
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