There's currently a nice showing of Pasque Flowers at Knocking Hoe at Pegsdon on the Herts. Beds. border.
They should still be good next W.E. - 25th April. I understand that there's also a good showing at Barton Hills, nearby.
If you go, I can recommend that you call into the village tearoom in Hexton for an authentic 50's experience!
Jim