Plant root divisions (basal stem pieces with attached roots) after last frost, 2 to 3 feet apart in rows 2.5 to 3 feet apart. Cold frames are also extremely effective Once the weather begins to warm again, be sure to pull back the mulch so the plant will feel the warmth and begin new growth. There are three ways of overwintering artichokes in the north. It is common for just one Jerusalem artichoke plant to produce as few as 75 but as many as 200 tubers during only a single growing season. But if you do, start seeds about 8 to 12 weeks before last frost. Artichokes do not set flower buds until their second year of growth, so overwintering these plants is rather essential. Wait until after the last frost date to plant pre-started artichoke plants. Insulate the roots with a deep layer of mulch that covers the entire plant and its root zone. Are artichokes frost hardy? 3 Ways Of Overwintering Artichokes. Artichokes are not frost-hardy, so the denuded base of the plant will need protection from the cold. Choose the site. Considering artichokes are native to the Mediterranean, it would seem unlikely that they would tolerate frosts very well, but surprisingly, artichokes can actually be overwintered with proper care. Each of these methods is described below. The tubers should be planted after the threat of the last hard frost has passed in the spring. 1. Harden off in cold frame. The easiest way to start harvesting artichokes in the first year of planting is to buy pre-started artichoke plants and transplant them into your garden. As soon as fall’s first frost arrives, it’s time to begin protecting the plants from freezing temperatures. Artichoke plants need full sun, so choose a spot that gets at least six hours a day. A thick layer of mulch at the plant’s base can help. Planting from seed not recommended because results are highly variable and usually inferior to parent plants.
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