I have one Epimedium in my garden Andre. It's a survivor! It took ages to grow to a significant size, but now its a fine looking plant. However, it needs dug up, so I can remove all grass which has crept into the very heart of the plant (I hate that). I'll replant it of course.
From the inference of the plant name, I presume your Epimedium rhizomatosum will spread?
The flowers look like little birds hovering! Tell us more about it, please. Is the specimen in the photo a new plant, or has it matured to those proportions? What height and spread?
P.S. Thanks for sending the originals to my gmail account. I'm looking at them now, and will add them to the Master Database.