Paul Truong, TVNI’s Technical Director has updated information relating to the tolerance of vetiver to cold. His slide presentation – COLD TOLERANCE OF VETIVER – should be of interest to users who live in areas of hot summers and cold winters – especially in desert areas where winter night time temperatures are very low, but have high winter day time temperatures that reduce the possibility of freezing and killing the vetiver crown- we have to thank Matthew Huffine who lives in the high desert (Mohave) of California for this information. The presentation shows that Vetiver can survive very cold winter, but dies when the crown is frozen in the ground. In very cold, frosted or under snow cover the outside plants of the thick sward protect the interior part, which remains green and actively treating effluent. Under extremely cold and dry conditions, its shoots turn brown but new growth resumes from underground buds.

Dick Grimshaw