[dice]

Actually you were right RayR, it was not a celery plant, it was
a parsley plant that was supposed to be high in iron. (Posts
edited above to reflect the correction.) And that was what I
used on the Madara plant that was showing iron deficiency
symptoms, a pureed, fairly large parsley plant watered into
the soil around the base of the plant with the deficiency.

(These days I have liquid chelated iron, and I foliar feed with that
to correct iron deficiencies. My plants show it when the soil is
saturated from several days of rain.)