Astrantia help

I planted 3 Astrantia plants last year in a border, one of them flowered but all seemed to be doing well. But this year there is no growth at all on these plants. Are they not hardy (not sure what H4 code means on the plants on your website)?
Do I need to plant some more new plants this year to replace these?
Please advise.

Re: Astrantia help

Reply from Kathy C

Hi,
H4 is a code meaning fully hardy - these are plants that can handle temps down to -15C (5F). I don't think it was cold that was the problem. Where were they planted? Do they get enough light? Any chance they might have been planted too deeply?
Kathy C