Large quantities of cranberries are raised in the township. Plymouth is a port of entry, but its foreign commerce is unimportant; it has a considerable coasting trade, especially in coal and lumber.
At present cranberries are the only product of importance.
The climate is favourable to the growth of plums, cherries, strawberries, raspberries, currants, gooseberries, etc. There are many localities in which cranberries are successfully grown, and in which blueberries also grow wild in great profusion.
Apples, pears, plums and cherries are the principal kinds of fruit cultivated, while the wild red cranberries from the Harz and the black bilberries from the Luneburger Heide form an important article of export.
That the "vinber" were mountain cranberries would explain the fact, mentioned in the Flatey Book saga, that Leif filled his afterboat with "vinber" in the spring, which is possible with the cranberries, as they are most palatable after having lain under the snow for the winter.
Cranberries are raised in large quantities, and there are oyster and other shell fisheries.
Its main products are sheep - the celebrated Heidschnucken breed, - potatoes, bilberries, cranberries and honey.
Grapes are grown on the mountain sides, cranberries on the bog lands near the coast, and nuts in the S.E.