You've got leaf shape contrast, color contrast and height contrast, which be nice. I guess the question is, how fast does the sedge spread? Even if it starts to take over some day, you love to garden, so you could thin or move the heuchera if nedessary. And you know what we always say, send pictures when you are done!

I don't have any grasses but I have lots of heuchera's as edging in beds - greens, purples, greenish with white (dales strain)and a caramel. I really like them in the spring (full and happy)but because my beds are so tightly packed, I tend to lose it visually by mid-summer as plants behind them get bigger and push out. But they are fine - come back again the folowing spring. Really easy to grow from seed too. Seed is so tiny, I gather and crush the whole dried bloom in a container and get tons of babies even though I can't see the seed!

Nancy

It's not exactly about edging but Margaret Roach from 'A Way to Garden' has a helpful description/tutorial about underplanting. Interesting way to think about setting out plants.

Here is a link that might be useful: Underplanting

onedaylily - thanks for the link. Very interesting & helpful reading.

Thanks for the article from me too! I think this will really help in an area I have been struggling with.