Apply as required during the growing season.
As a base dressing (before sowing or planting)
Work into the soil at the rate of 70g/m2 (2 oz per square yard)
As a liquid feed
Epsom Salts are best applied dissolved in water at the rate of 90g in 4.5 litres (3 oz per gallon). Apply to the leaves with a sprayer or watering can, or add at monthly intervals to normal liquid feeds.