In article ,
"David E. Ross" wrote:

zinc sulfate

Sort of reminds me of my ongoing quest for Iron Phosphate. Which got me
to call again and it is shipping at the end of the month! Happy happy
Joy Joy order placed July 3 08. This from ScienceLab most likely
they have zinc sulfate but too pure and expensive for your needs.

Wondering in you can replace zinc sulfate with something similar ?

Bill

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Garden in shade zone 5 S Jersey USA