Root Harvest

The root size of E. pallida and E. angustifolia is suitable for harvest beginning after the second growing year. According to Romanian and Polish experiences, root harvest during the end of the third year results in higher root yields. In the case of good growing conditions, root harvest of E. purpurea propagated from seedlings can occur in the first year.

The root harvest can be combined with the herb harvest as well. This means that before the root harvest, the herb could be utilized without harmful effects on root quality. The roots can be harvested in smaller areas by hand but on an industrial scale, machinery must be used. From the practical point of view, poor root harvests depend on improper root depth. Horizontally, the roots of E. angustifolia are concentrated in a region extending 150 mm on either side of the row. More than 90% of the roots of 2-year-old plants could be dug out from a depth of 27 cm. The roots of 3-year-old plants are deeper, since 78% and 92% of the total root yield are obtained from the 36-and 45-cm depth (Bantle et al., 2000).

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