Delosperma congestum 'Golden Nugget'
Delosperma congestum 'Golden Nugget' is one of the most cold hardy species of Ice Plant. It has taken -17F in our garden and has taken -20s in Iowa and much of the midwest. It is a dense growing species that gets intense flowers several times a year. Its biggest problem is that it does not like above 105F for very long. Plants shipped in pots.
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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Photos by Kyle Dallefeld