Trouble with rock and water plants...

hey guys, new to this but hopin you can help me out. iv been having a spot of trouble identifying these plants i photographed from Sheffield Botanical gardens last week...:cnfs:
help with any of these will be greatly appreciated thankyou :D

 

ooh cricked neck too lol, top one is a fern :D (dryopteris: Linearis polydactyla or linear male fern) I've got one of those in my garden i planted a couple of years ago and it started dying back so thought no more of it, but it's made a full recovery and looks fab now.
I'd be very interested in what the plant in the 4th image is, as I've got loads of that in my middle bed (front garden) and it looks fantastic, and has got very big and bushy and autumn/ winter time it gets the tiniest of colour flowers on it

 

ah good point... sorry i didnt realise they werent all upright...:dh: il change it now
appologies