Posted: 01/06/2015 at 11:42
Working at ICI you picked up all kinds of useless knowledge .
MgSO4 Epsom salts, magnesium sulfer ( sulphur ) oxygen. Good for potato's tomato's roses carrots peppers even fruit trees, it is a trace element of chlorophyll and takes in moisture from air hence the good effect it has on green leaves. It does not alter the PH of soil, only affecting the leaves of acid loving plants, as with all things there are a few myths connected to it.
Topping up my tomato pots every few weeks with good compost a spray with Epsom salts does wonders, easily soluble in water two tablespoons to a large watering can does the job.