Cheiridopsis candissisima is another new species to me, this is a more dwarf form from what is commercially grown, which I think helps with cold hardiness. We planted several in the garden last year and i didnt have any die taking -8F with a light snow cover and -2F with no snow cover. However in the summer I had several die from heavy rains in August. Needs to be a tester in your garden. Plants require fast draining soil.
I do not guarantee these in a zone 5/6/7 because everyones growing conditions are different but this would be a good trial plant to grow in your cold outdoor garden. Try to plant outdoor 90 days before 1st hard freeze.
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