She urged growers to start looking at ways of reducing their peat usage and she recommended manufactured wood fibres as a peat replacement.
Holmes said: "The new Defra targets focus on the carbon left in the ground and although 2030 sounds like a long way away, it's actually quite a short timescale.
"Reducing peat is always the first step, but it's going to be a lot more complicated than it used to be and you have to think carefully about what you are growing and what is going to suit you. The retailers we grow for are looking for people to show their environmental credentials and for people to use less peat."
She added: "The end customer is not really aware of the issue, but that's going to change and there will be a lot more education of people."