If waste is found fly-tipped and people are unable to show they took reasonable steps to prevent someone else dumping their waste unlawfully, action may be taken against them, a forest spokesperson said.
As well as harm to the environment, and potential prosecution, fly-tipping can cause harm and even death to local wildlife.
“All animals, both wildlife and our farm animals, all can suffer immensely if they eat the plastic bags covered in this cannabis that can block their gut and they can die a terrible death,” said Mr Marland.
Ash Walmsley, the forest’s head of countryside, said: “Broken glass, sharp metal, and chemicals can cause serious injury to wildlife and this thoughtless and dangerous dumping detracts from the hard work being done by our staff and volunteers to protect this rare and cherished landscape.”
To help fight against fly-tipping, Ms Morgan explained: “It is easy to check that they are registered by initially asking for their registration number and then checking this with the public register.
“If they are unregistered or they have given you a false reference, there is a chance that your rubbish will be fly-tipped and could end up somewhere like Ashdown Forest.”
People could receive an unlimited fine, a criminal record and up to five years in prison, Ms Morgan added.