Hi John. Nice to meet you.
I agree that this Erodium is not hardy to zone 3. In our database entry it gives zone hardiness to zone 7. I'm not sure if anyone has grown it successfully in a lower zone.
There is a nice list of Erodium in our database. You may have already found it.
https://garden.org/plants/sear...
Have you tried using the search on your home page?
We also have a forum for rock gardening.
https://garden.org/forums/view...
I hope this was helpful. I look forward to hearing more about hardiness of different plants, from your experience. It is very helpful to many.
Do you have rock gardens?
