Succulents and cacti rated for Zone 5 or colder — down to −28°C (−20°F) and beyond. From native prairie prickly pears to alpine houseleeks, these plants thrive in rock gardens, raised beds, and the harshest Canadian winters.
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Pro Tip: The #1 killer isn't cold — it's wet, frozen roots. Always plant in well-drained, gritty soil or raised beds. Many cacti survive Zone 3 in the wild but struggle in Zone 6 with heavy clay soil.