My local garden centre tells me that they cannot get Sequestrene any longer. I cannot find any on line either. Does anyone know why it has been discontinued? Also what suitable alternatives are there?
Tim, look for "sequestered Iron plant food". Sequestrene is just a brand name for the same thing (a soluble food containing Iron often used for feeding acid-loving plants.)
Not sure if it can be used as a substitute, but Iron sulphate is widely available, usually used on lawns.
Thanks everyone. That is a great help.