The bog at Danbury Ridge is one of only a few of its kind in the county
A rare lowland raised bog at Pheasant Hall Wood in Danbury is being restored by the Essex Wildlife Trust.
Conservationists have spent the winter clearing away holly, which they believed had drained the bog of water.
Reserves manager Leanne Sergeant said the work has been vital to restore one of the few sites of its kind in Essex.
"Part of the work was to remove the holly, the other was to monitor the water coming in to the bog to see if we can improve its levels," she said.
"So what we've done is dig a few trenches at differing heights into the peat to see if taking some of the surface layer of leaf litter and brambles can rejuvenate the bog plants," she added.
Leanne explained much of the work involved removing a thick section of holly.
"It has come into the wood in the last 30 or 40 years and completely changed the character of the woodland," she said.
"We felt the holly was contributing to the drying out of the bog, so we've pulled it out of this area."
She hopes the the work will in time encourage bog plants to the area.
"We've got starwort here, which is one of the rare ones," she said.
"There used to be bogbean here, but we haven't had that for a long time, but who knows what might come back here after this work."
The work is part of the Trust's winter work at Pheasant Hall Wood, which also includes a programme of coppicing.