After months of delay, a plan for Christchurch's residential red zone has been revealed.

The plans included a green spine 150m either side of the artist's impressions of the Christchurch river red zone, from Regenerate Christchurch, costing $150 million.

The green spine would be made up of wetlands, cycleways and orchards, and accounted for half of the 600 hectare area.

Private investment would be needed for other things, including cafes and a kayak hire business.

The Eden Project had already expressed interest in building an eco dome.

There was no space for large-scale housing meaning the government was unlikely to get a return on the money it had spent to buy the red zoned land.

Photo: Supplied

The ideas were part of a month-long exhibition that would open tomorrow, where the public could give more feedback.

A final decision on what will happen with the land will be made by the Greater Christchurch Regeneration Minister Megan Woods in November.

Regenerate Christchurch had previously released ten options for the Avon-Otakaro red zone, which was a result of 5000 ideas the organisation received from the community.

The red zone used to house 9000 people before the Christchurch earthquakes in 2010 and 2011.