Chlorosis in Helleborus?

The new growth on my Helleborus seedlings is very yellowish. Our soil west
of Chicago is quite alkaline, but hellebores are supposed to like that. Our
water is probably also alkaline. I have tried feeding the seedlings
acidifying fertilizer, micronutrients, ironite, magnesium but have not
noticed any difference. I never had this problem in Ohio. My seedlings there
were a healthy dark green. What should I do?

Eva Thorn
St. Charles IL, zone 5

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