I've never heard of anyone describing epimediums as "invasive" or even very aggressively spreading - they tend to be colonizers, forming slowly expanding clumps over a period of time. In fact, I'd say many would consider their growth and spread not to be fast enough :-) The easiest way to control spread is to sever any rhizomes that stray too far away from the mother plant with a sharp spade and remove and replant elsewhere (or give to fellow gardeners).

The edging could also work but would not be MY first choice from a purely aesthetic standpoint.

Thanks Gardengal. They have established themselves very well and are spreading a lot now. I did use a spade on them yesterday and have a bucket full of rhizomes. I love these plants and the droppings from the Silk Tree get swept under the carpet of their leaves. I gave the epimedium a haircut yesterday so we can enjoy the early yellow flowers. Anyone on Vancouver Island want some rhizomes?

Here is a picture of the epimedium.

Here is a link that might be useful:

Looks very happy.

Hi Dotty I might be interested in some,Do the deer eat them?
I could come next Friday perhaps, let me know,
Cindy

The deer don't eat it, and yes, you are welcome to some. I'll try and pot some up for you. Friday would be fine.

Great, I'll send you a email for your adress. don't know for sure if I remember how to get there. My friend Jane and I are in need of a drive,see you then
Cindy