primulas wilting.

I have a couple of yellow primulas this year.They seem to have flowered,and then wilted quite quickly,the flowers dont look damaged in any way.Is this common with these plants,and should I dead head them as there is quite healthy flower buds forming?

Hello, Don't know exactly what the problem is but I would suggest watering them,as wlting can be caused by drying out, especially in this unseasonal (but great warm) weather