Some bamboos grow a meter a day. It's also a good way to bioremediate nitrogen pollution, they should really do that in places like The Netherlands where excess

Some bamboos grow a meter a day. It's also a good way to bioremediate nitrogen pollution, they should really do that in places like The Netherlands where excess nitrogen from livestock has become an issue, but I don't know if the weather is compatible with bamboo. Some grasses that can be used for paper-making could also be an option.