A row has broken out between the Greens minister and the opposition, the Liberals saying they will adjourn any items Mr Rattenbury presents as a Green, instead of in his role as a government minister.

A ''flabbergasted'' Mr Rattenbury described the move as ''undemocratic'', but the Liberals shot back, calling the Greens MLA a ''cowboy'' who wants his own way on all matters, including items not supported by cabinet.

The stoush began on Thursday when Mr Rattenbury introduced a Greens motion on fuel pricing in the territory during executive members' business.

Opposition Leader Jeremy Hanson said Mr Rattenbury wanted to be ''all things to all men'' - a minister and a crossbencher - and the Liberals did not want to adjudicate on items that could not be resolved through ''internal squabbles'' between the Greens MLA and Labor ministers.

''We are not going to accept a position here where we have to not only deal with a Greens-Labor coalition government, but also the Greens as a separate entity,'' Mr Hanson said.

He said ''as a general rule'' the opposition would adjourn items brought by the Greens MLA that ''should otherwise be brought forward by the government''.

Mr Rattenbury said the move was ''disgraceful'' and attacked the Liberals for shooting down his fuel price proposal, which he said was a replica of legislation introduced by the O'Farrell government in New South Wales.

He added that executive members' business had been part of the Carnell government with independent Michael Moore serving as a minister in the Liberal minority government.

''It's an attempt to silence my voice in the Assembly to some extent,'' Mr Rattenbury said. ''In some ways, this strengthens the hand of the ALP because they now know that if the opposition takes this stance, things can't get done that the ALP doesn't support.

''You could almost draw the conclusion the Assembly shouldn't bother sitting for the next four years.''

Mr Rattenbury said he would remain open to supporting Canberra Liberals' proposals, a position he had taken on ''day one'' of the minority government.

Mr Hanson said the Liberals would stick to their principle because the only purpose of a Greens motion to the Assembly was that Mr Rattenbury ''could not get his agenda through cabinet''.

''That's not my problem,'' Mr Hanson said. ''What I'm trying to do is bring some rigour back to the Assembly and not this ad hoc cowboy approach.''