Hi,
Not sure if this helps but I found this on the BBC Gardening Site:
Cranberries - The plants are low-growing, creeping shrubs that grow best in damp, acidic soil and make ideal ground cover between other acid-loving plants such as rhododendrons. If you don't have naturally acidic soil, try digging a sunken bed in the garden, lining it with perforated black plastic and filling in with ericaceous compost. These are shallow-rooting plants, so you don't need to dig deep. Cranberries can even be grown as trailing plants in hanging baskets - just four plants will provide a family with a year's worth of berries, and the delicate spring flowers and colourful autumn foliage ensure year-round interest. They will need plenty of water, but don't require any pruning, and only a pinch of food every month during the growing period. When buying plants, make sure you buy mature plants: most varieties won't produce a good crop of berries until they are at least two years old.
~
Lawrence