My SIL gave me a tiny start of her Siberian Iris a few years back. It does really well, blooms all summer. People will stop and ask what it is, it's that pretty that it stands out among a dozen other plants.

It's in the same bed with palace purple coral bells, a disco bell hibiscus, some black eyed susans and purple cone flowers, stuff like that- none of it gets water unless it's a draught.