Opuntia 'Snowball' is a select hybrid of Opuntia polyacantha produced by Tom Jesch at Waterwise Botanicals. We are lucky enough to sell some clones from them. Plants get their name 'Snowball' because flowers are white. We have had this plant in our garden for 25 years, they have proven cold hardy taking -22F several times. Plants can get 18" tall and 3ft wide.
I do not guarantee these in a zone 5/6 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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