I have quite a few proteas which are in poor shape. They are grown
from seed sourced locally (in the illawarra) from clay/loam soil and
sandstone soil. Not all plants are affected, but many are. The
symptoms are yellow and stunted growth. They are in a medium of
clay/loam soil mixed with 20% coir and 10% sand and perlite mix. A
picture is at:

http://www.speedlink.com.au/users/kd21/sick-plants.jpg

Any suggestions as to what's wrong, or remidies greatly appreciated.

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