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Can anyone tell me why the primula denticulata flowers in my garden have grown so tall this year?  Instead of standing upright and the stems being 8 to 10 inches they are 15 to 18 inches tall and flopping over to the ground.

Could well have had a lot more moisture this spring.
                                            Montanum

We sure have.  Just noticed that you are from North Wales Montanum....  Me too   .........small world init. ;)

Too much nitrogen and possibly too much heat but not enough light making the plant leggy. My sedum goes like that because the bed is too furtile.