Some seeds I simply cannot germinate

Carlisle, PA(Zone 6b)

I have trouble with the Prickly Caterpilla, Lychnis, Variegated Yucca, etc. Prickly Caterpillar comes up but dies. Lychnis does the same thing and variegated yucca comes up with no chlorophyll and dies eventually. All are germinated in pots in my greenhouse. Any suggestions? Thanks.

Calgary, Canada

Have you consulted Dr. Deno's database? or the Ton Clothier one?

Carlisle, PA(Zone 6b)

Nope, Will have to look them up. Thanks. I just thought somebody who had success with these could give me some hints.

Calgary, Canada

If they die after coming up---maybe the soil needs to be sterilized?
Chamomile tea works, as does diluted hydrogen peroxide.
I don't grow any of those.

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