can someone point me in the right direction?

i have a supply on my back deck of emerald green shamrocks.

they bloom and do well. and i try to take good care of them each year.

my supply or example of Iron Cross shamrocks lived alone in the front yard.

i transplanted the survivors to a pot, and they did well until i allowed them to flounder.

i really like our potted emerald green shamrocks, with the white flowers.

the iron cross shamrocks had red flowers as i best recall.

anybody got a direction to a replacement supply?

they are a long-lasting perennial flower.

i am looking for a re-start.

can you help?