Iron sulphate for moss as plant food

Hi all, decided to try some water soluble iron sulphate on lawn this year. I've so much left. Can it be used on my acidic plants or will it do more harm?
For the lawn I used 200-240grams into 8L. I have a 25 kg bag of the stuff so thought could use on hydrangeas, magnolia, camelia and acers etc. Should I dilute it further just to be safe?
Thanks all
For the lawn I used 200-240grams into 8L. I have a 25 kg bag of the stuff so thought could use on hydrangeas, magnolia, camelia and acers etc. Should I dilute it further just to be safe?
Thanks all
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