What does -29 degrees C represent? I understand that this plant (English Ivy - glacier) has hardiness zone of 5-9. But from quick Google search, those zones are associated with warmer temperatures.
Poison ivy - Wikipedia
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English Ivy Hedera helix growing up old tree Bowen Park Nanaimo Vancouver Island British Columbia Canada Stock Photo - Alamy
How to Grow and Care for English Ivy | BBC Gardeners World Magazine
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ALTERNATIVES TO INVASIVE ENGLISH IVY — Todd Haiman Landscape Design