sequesrered compounds

You can buy 'sequestrine' plant tonic in most garden centres, usually in a powdered form, or a concentrate that you need to dilute.

Or you can save yourself a lot of money by buying a high iron tonic from the chemist and diluting it well. Sequestered plant tonic also contains magnesium so add a spoonful of epsom salts to the same water. The industry may frown (they want you to spend loads of money) but, it works just the same.

John