How to Grow Cranberry
Other Fruit
Cranberries are low, creeping evergreen plants for a specialist acid bed, pot or trough rather than ordinary garden soil. Their small pink flowers and red autumn fruit are attractive, but success depends on permanently moist ericaceous conditions. They are a satisfying niche crop where rainwater and acidic growing media are readily available.
Planting
Plant container-grown cranberries in spring or early autumn into an acid bed, trough or wide pot filled with ericaceous compost. Space plants 30 to 45 cm apart so runners can knit together. Plant at the previous depth, water with rainwater and mulch lightly with pine bark or other suitable acidic material. They need no trellis, but a pot or raised edge helps contain spreading stems. Do not plant them in ordinary soil or alongside lime-loving plants.
Care & pruning
Keep the compost evenly moist all year, using rainwater whenever possible, but do not leave plants submerged. Top-dress annually with fresh ericaceous compost and use only a suitable organic fertiliser if growth is poor. Prune lightly in late winter, removing dead, overcrowded or excessively long runners while retaining productive upright shoots. Weed carefully by hand, as cranberries are shallow-rooted. Refresh containers periodically when the growing medium becomes compacted or less acidic.
Harvest
Harvest from September to November when berries are fully red, firm and glossy. Fruit often colours unevenly, so pick several times rather than stripping plants too early. Gather by hand in dry weather and use sound berries promptly in cooking or store them chilled for a short period.
Common problems
The commonest failures come from alkaline water, lime-contaminated compost or plants drying out. Use ericaceous media and rainwater, and check moisture frequently in pots. Birds may peck ripe berries, so net where needed. Vine weevil larvae can damage container roots; inspect plants, remove grubs by hand when found and refresh badly affected compost. Good drainage prevents root decline from stagnant conditions.
Growing Cranberry: frequently asked questions
How do I grow cranberry in the UK?
Plant container-grown cranberries in spring or early autumn into an acid bed, trough or wide pot filled with ericaceous compost.
How do I care for cranberry?
Keep the compost evenly moist all year, using rainwater whenever possible, but do not leave plants submerged.
When is cranberry ready to harvest?
Harvest from September to November when berries are fully red, firm and glossy.
General guidance for UK gardens and allotments. Timing varies by region and season; the RHS or a local garden centre can advise. Page updated 18 Sep 2026.