Can artichokes survive winter in cold climates?

Newer, "cold hardy varieties" varieties of artichokes (like Imperial Star & Tavor) can withstand cold temperatures in winter if adequately protected. These hardy plants can survive in the far north, down to at least zone 5, with sufficient frost protection. The "perpetual perennial" varieties tend to produce tap roots much stronger than the annual types.

Crown insulation: foam collars around the plant base protect the 'crown' of the plant, where growth may otherwise be killed by hard freeze. Add lots of mulch on top and you'll provide the best possible protection. I repeatedly experience a boost in survival odds of fifty to seventy percent per winter (zone 5)!

Monitor soil moisture prior to ground freezing. Ensure deep watering occurs in late fall to avert desiccation. Too moisture in the soil around the crowns causes rotting. A few crude soil thermometers will enable one to keep track of root zone temperatures. Roots will survive temperatures as low as 20 degrees F. when well protected.

Fall hardening gets plants ready for winter. Stop fertilizing plants 6 weeks before the first frost. Cut back on watering (gradually) to slow growth. Remove any dead foliage on the plant that may harbor disease. This natural conditioning will significantly increase the crop's resistance to cold.

Read the full article: How to Grow Artichokes Successfully