Cranberry 'Pilgrim' plant in 1.7L pot

They are tough, rugged little berries, that like naturally acidic soils - think scrubby moorland, so if you give them this, they are easy. This means most people need to grow them in pots, in acidic (ericaceous) compost, and you will be fine. They are quite a trailing plant, so choose a tall pot, or even a hanging basket, so the ripening red fruits can cascade down the sides.