Primula denticulata 'alba'

What a great plant - why can't I grow them?? Please tell me what conditions they prefer!!!!!

I've always found them un fussy. This one is in a chalky poorly fed loam that gets full sun for about 6hrs. The other mauve ones are in similar soil ie chalky but range from damp, coz of overflow from the pond to mid dry shade under the beech tree. Hate to say it but they get a bit rampant. have you seen my other picky? that is a 4 year old clump. :o)