Cultivation
Black salsify is hitherto mainly a European crop. Belgium, France and the Netherlands are the world's largest producers of black salsify; significant amounts are also produced in Germany. In the latter country, 'Hoffmanns Schwarzer Pfahl' is a cultivar widely used by commercial growers, while 'Duplex' is popular among small-scale gardeners. Some other cultivars are widely available, but because it was rather a localized crop before being produced for a wider market there are comparatively few landraces.
Harvesting is somewhat complicated, as the roots are quite fragile, and broken material loses freshness. Entire roots will keep fresh all winter if stored in a cool dark place, due to their robust black corky skin. In root cellars they may keep fresh well into springtime. It is, however, very hardy and will grow well in most cool-temperate climates and usually yield 15-20 metric tons of roots per hectare. In British gardens it is common to profit from its perennial character by leaving it in the ground until its roots have grown to sufficient size for harvesting; this can take two years. Commercially, it can be grown best as the year's second crop of a field.
Read more about this topic: Scorzonera Hispanica
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