Bleeding hearts - is t ok to prune them?

They're looking quite messy now-is it ok to prune them back a bit?

 

Yes, you can Snorky. Their foliage can get a little tatty now so a "tidy up" is fine. Not too much though...that foliage helps feed the plant during the summer.

I grow a few dicentras and cutting back ...as above...has never hurt them.

However, I grow plants around them that tend to grow over and disguise the dicentras like salvia love and wishes, wild swan anemone, persicarias and others thus avoiding cutting back too much.

 

Thanks @Verdun Mine have grown huge so would take something big to disguise them - I think I've found an ideal spot for them - they really seem to grow well. My lupins on the other hand - I think I need to abandon them or move them for next year.

 

That's ok snorky....
Dicentra foliage isnt that bad and if "tidied" will still look good.

Lupins? I dig up a few every year....they do look really tatty after flowering....and divide them. Pot them up, label (for colour) and put in the shade out of sight. Come September plants will have grown well

 

Yeah - I did that with the lupins last year but this time I will replant them elsewhere. The spot is just far too hot for them.