Titanopsis hugo-schlecteri is one of the slowest growing species from western South Africa. It is quite cold hardy if you can limit the amount of moisture it gets in winter. It did fine with 0F when it was covered in snow. But rain at these temperatures wil probably kill this species. The plants available are an assortment of colors mixed together.
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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