Ginseng is showing early signs of senescence in most gardens, but senescence is more advanced in some areas. Early senescence is often due to hot conditions earlier in the year, moisture stress at times, and root diseases and disorders like Pythium root dieback, abiotic rusty root, or Cylindrocarpon. Excess nutrient concentrations in the soil could also lead to early senescence if it damages fibrous roots. The risk of foliar diseases, especially Alternaria, is higher when plants are stressed.
As fall approaches, it is important to keep monitoring soil moisture levels and irrigate when necessary. Although days are shortening, temperatures are falling, and the ginseng is beginning to senesce, the crop still needs a steady supply of moisture to prevent plants from shutting down too early. Low moisture before harvest may also increase the risk of red root/red vein after drying. In recent years, hot and dry conditions in the fall have become more common.
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