Epimedium x rubrum

Just split up, take advantage of a good deal, plant a few to get an instant clump.

A hardy, plant-it-where-you-like plant. The fastest spreading rhizomatous epicedium, drought tolerant when established but happiest in light shade and moist soils. They are all fairly tough during mid summer and very hardy. A dense mound of reddish green leaves and what looks like pink sprays overall in spring. Chop the leaves off before flowering to see them best. 50-60cm spreads to 1m eventually.

Closeup: Peter coxhead, CC BY-SA 3.0 , via Wikimedia Commons

Habit with leaves: Salicyna, CC BY-SA 4.0 , via Wikimedia Commons