I can't say for certain, but blanda foliage does look like a common weed we have here in north Texas and I almost did the same thing last year.

The De Caen's foliage looks like parsley.

I may be mistakedm but I don't think De Caen can take the winter you've had. I know they want cool greenhouse conditions: 50s 60s 70s.

Can't wait to hear what the experts have to say
cynthia

You certainly didn't do them any good. Maybe they'll survive, maybe not. I forgot about some Anemones the first year and just couldn't work out what the really weird Geraniums were when they came up!

The De Caen hybrids are hardier than most people think but they are also temperamental and often fail to return. Not entirely sure of all the reasons why.

Anemone blanda are very tough, but repeatedly ripping the foliage off them might have killed them.