Euphorbia Recommendations

I'm looking for several varieties of Euphorbia that would be suitable for giving some height to a shady and problematic corner of the border.

I already have Euphorbia Martinii elsewhere which is spectacular, but not that tall. I know there is a beautiful blue/green one with yellow flowers which can get quite tall but no idea of the name.

When I say tall, I mean 4 foot. Ish.

 

Sorry Bob, that's not it. The one I'm thinking of is light blue/green, with the characteristic yellow blooms.

How big do Purpurea grow to?

 

Ta muchly. One to remember - a couple of them can go in front of the tall one I'm thinking about!

I'm hoping for some ideas at Hampton Court Flower Show.

 

The only one that I have is Euphorbia griffithi 'Fireglow' which is a good plant. http://www.bbc.co.uk/gardening/plants/plant_finder/plant_pages/307.shtml

I think other popular ones are Euphorbia characias subsp wulfenii http://www.shootgardening.co.uk/sitePlant.php?plantid=900 and Euphorbia schillingii http://www.bbc.co.uk/gardening/plants/plant_finder/plant_pages/8686.shtml

 

Thanks Bob - that's something I didn't know. I will have a look tomorrow.