The sunflower species that provides a hardy, winter-ready harvest
In short: Often called sunchokes or earth apples, Jerusalem artichokes are a gardener's secret for late-season food. These incredibly hardy perennials are easy to grow, requiring minimal maintenance, and can even serve as a natural windbreak for your more delicate garden crops.
Native to Eastern North America, Helianthus tuberosus is a member of the Asteraceae family, making it a relative of the globe artichoke, though the two share very little else. Despite the name, the 'Jerusalem' label likely stems from a linguistic evolution of the Italian word 'girasole,' meaning sunflower. While they can thrive in partial shade, they are most productive in sunny locations with fertile, moisture-retentive soil. If you are planting in exposed areas, consider the 'Dwarf Sunray' variety, which reaches only about 120-150cm, whereas standard plants can tower up to 3 meters tall.
Growing these plants is a cost-effective endeavor because they are remarkably resilient. You can plant them in large containers if ground space is limited, and they are particularly useful for providing a harvest in late autumn and winter when other crops have finished. To prepare the site, you might fork well-rotted organic matter, such as garden compost, into the soil, or simply incorporate it into the mulch if you follow no-dig principles. It is important to avoid areas prone to waterlogging, as the tubers are susceptible to rot.
The process begins with selecting firm, smooth tubers, ideally sized just under that of a hen's egg. When planting, place them 10-15cm deep and roughly 30cm apart. For a continuous cycle, you can simply leave a few tubers in the ground after harvest; they will sprout in the spring to produce a new crop by autumn. You can even multiply your stock by cutting larger tubers in half, provided each piece contains at least one eye or growth point. This ease of propagation makes them a highly sustainable addition to any edible garden.
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Sources
- Summary by Intellect · source: How to Grow Sunchokes (Jerusalem Artichokes) from Tubers
- Also: How to grow Jerusalem artichokes | RHS Guide
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