Gyve Turquoise said:

Is there any common product I can use as a substitute for chelated iron or
any easy way to cook the stuff up? What I want to do is solve my tree's
problem with the lack of iron, so any suggestions are welcome.

Iron sulphate is usually one of the ingredients found in fertilisers that
contain micronutrients.
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Gardening Zones
Canada Zone 5a
United States Zone 3a
Near Ottawa, Ontario