I have a similar one---it's actually larger and more impressive than biennis. I believe it's either hookeri or erytherosepala. I've counted upwards of 75 blooms on one plant! It IS a biennial, and I have plants that should flower this summer. I'm really interested in both your Heucheras and your potentilla.

It's moderatly invasive/rampant here and I pull dozens every year when doing spring clean-up in my flowerbeds. I always leave the main clump for the bright, cheerful flowers but I yank any that stray far from it. It was here when I moved to this house; I didn't plant it and, based on what I've seen it do, I likely wouldn't. There are lots of others that are much better behaved. I've never seen hummers on or near them but I've only just started planting things that attract them the past 2-3 years.

Kasha, I have this plant. We call it Evening Primrose, or moonflower. I saw it at a friends house and fell in Love with it. I now have the joy of watching it open every evening spring - summer. It is still green but I think it would be best to wait till spring. I would send you some plants then. If you want seed I will have to dry them and you will not have flowers for 2 years. gmom

I have evening primrose flowering presently - can save you seed pods if still required. Sue Here is a link that might be useful: Tortsmad