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I've just learnt about Epsom Salts - I believe it adds magnesium to the tomatoes which they sometimes lack. Did you just add the Epsom Salts neat as the powder or did you mix in water to apply?

I just spreaded the salt on top of the soil a few inches away from the stalk. That way it will slowly with watering and rain get to the roots.

Thanks for the tip @engineerprepper - I'm going to try that now.