"The debate thus far in this country and I accept probably across successive governments, with respect to water has been too immature."
Water storage should be considered before imposing environmental limits on farmers, who need it for land-use flexibility and to be able to respond to "regulatory challenges over time" said Muller.
Muller said his party understood the importance of farming to New Zealand and would endeavour to ensure it remained at the centre of the economy "for the next 20, 30, 40 years".
"We need to think really precisely and deeply around what policies are required to enable farming in New Zealand to be successful and it is not Wellington telling farmers what not to do and how to farm."
Also in today's interview: Muller had strong words for Winston Peters and praise for Simon Bridges' decision to rule out any deal with NZ First.