Former Labor premiers Paul Lennon and Michael Field and former Liberal premiers Robin Gray and Tony Rundle jointly warned about the "dangers of minority government".

"We believe Tasmania's interests are best served by a strong majority government and an effective opposition, rather than a government that will be beholden to a minority Green party that is intent on pursuing its sectional and often radical interests above all else," they said.

The sentiment was echoed by Premier David Bartlett and Opposition Leader Hodgman yesterday, while Greens leader Nick McKim said the "dinosaur" message would not resonate with voters.

"The views ... are old-style views, bogged down in old-style divisive politics," Mr McKim said.

Mr Bartlett said Labor would be the likely beneficiary if the ex-premiers' message managed to sway potential Greens voters.

Mr Groom - who was premier between 1992 and 1996 - yesterday said he turned down an invitation from Mr Lennon to join the group of former foes.

"I haven't made a political comment since I retired ... I feel that I should leave it to the next generation," he said.

Mr Groom resigned after losing majority at the 1996 election, in which he promised he would only govern in majority.

Mr Groom said the fact that his son - Matthew Groom - was a candidate in Denison was an "added complication".