Hedges: Thuja Occidentalis - Smaragd rust phenomenon

Discussion in 'Gymnosperms (incl. Conifers)' started by ianb, Mar 3, 2008.

  1. ianb

    ianb Member

    Messages:
    1
    Likes Received:
    0
    Location:
    Soquel, United States
    I live in Soquel California, 90 miles south of San Francisco and 5 miles from the ocean. About 6 months ago I planted 24 Thuja Occidentalis 'Smaragd' trees that I planted about 24" apart. The intent was to hedge a small area on our little horse farm.
    12 plants face south and another 12 face east. 2 have died and the other 22 have turned rust on the sun facing side but are green on the side away from the sun.
    I am quite concerned. Thanks a million for any help.
     
  2. Michael F

    Michael F Paragon of Plants Forums Moderator 10 Years

    Messages:
    11,417
    Likes Received:
    501
    Location:
    Britain zone 8/9
    Can you post a photo?

    Chances are they'll be OK, the foliage often does get a bit bronze-toned on the sunny side in winter. Turns green again as the spring progresses.
     
  3. Ron B

    Ron B Paragon of Plants 10 Years

    Messages:
    21,251
    Likes Received:
    786
    Location:
    WA USA (Z8)
    "Rust" sounds more dramatic than the normal subtle winter bronzing of this cultivar. Are the rootballs being kept moist all the way through? Do poke around in them and check.

    If it's just winter discoloration the affected leaves will still be fresh and alive in consistency. Crispy and dry indicates mortality.
     

Share This Page