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I usually have good luckI usually have good luck growing lettuce in raised beds and over wintering under plastic. THis year the lettuce is very dry and stringy, wilting on picking, and not growing very fast. The only thing I did differently is to add some gypsum (mixture of CaSo4 and MgSo4--"Soil Doctor") last fall because we have a heavy clay soil. Is gypsum harmful to lettuce? Thank you very much for any help.

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