CELEBRITY gardener Peter Cundall will return to court today on charges relating to an anti-pulp mill protest in Hobart.

The gardening guru, 83, was among 50 people who protested against the state government's approval process for the proposed Gunns Ltd pulp mill at parliament House in November.

All of the protesters were arrested after they ignored the direction of a police officer to move from the building's steps.

Cundall was among a group of more than 20 whose bail conditions excluded them from being found anywhere near parliament house, Salamanca Place or Battery Point until their court appearance on February 3.

But the group later succeeded in having their bail conditions eased, with police admitting the conditions were inappropriate.

The activist gardener now faces court today on a charge of failing to comply with police direction.

The protest group, Pulp the Mill, says the state government's fast-track approval of the $2.5 billion project, in the area where Mr Cundall lives in the Tamar Valley, was an abuse of power.

They want a royal commission to investigate the state's approval of the mill and the propriety of its Pulp Mill Assessment Act.

Protesters have failed in previous court action arguing against the Pulp Mill Assessment Act.

The pulp mill's construction has been approved by state and federal governments, and Gunns is in the process of finding a financing partner before work begins.