You will be fine with planting them in light shade with some sun, All Heucheras need some sun & light to perform best. Even though some websites indicate that they can be full sun to part shade, I found that for my zone 5a (Northern Illionois), they do much better in part sun. Full sun (>6 hrs) can burn the leaves (except a few dark purple ones). On the other hand heavy shade does not bring the best foliage color or growth rate.

I have Paris which is similar to Firefly (green with red/pink flowers). It is in the light shade location with 2-3 hrs direct sun (used to have more but the tree gets bigger). It really likes the location and the blooming starts in later April/early May and all the way to first frost.

Heuchera Paris (picture taken 2 days ago)

Best of luck.

Awesome, thank you! I will plant them in different spots so they get differing amount of light and I'll see which one does best. I may have to do some moving later. That Paris looks so nice! I love the colorful flowers on them.

Vivan: Is that unusual for Paris to bloom for all those months? It would be worth it alone to pick that one up just for the blooms.

Barb

Barb, For the last 3 years since I planted Paris, it has been blooming consistently from spring to the fall. It may slow down during the hot summer weeks but still blooms. I can't find 2014 picture. Here is one from Late Aug 2013.