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Vaccinium macrocarpon

Cranberry

At a glance

Light
Full sun
Hardiness
Hardy down to −30 °C
Harvest
Sep–Oct
Spacing
30 cm, rows 40 cm
Water need
High
Cranberry

Photo: Photo by Keith Weller · Public Domain · Source

This description was machine-translated.

Description

The cranberry is an evergreen, low-growing dwarf shrub that bears large, bright red, tart berries. It originates from peatland habitats and thrives in wet, acidic conditions, making it suitable for balcony pots when grown in peat soil.

Care instructions

Plant the cranberry in acidic peat moss soil at a sunny, consistently moist location, preferably near a pond. Water generously with low‑alkalinity rainwater, as the plant does not tolerate drought well. Mulch with acidic material and harvest the berries in September; their full flavor develops after the first frost.

The care notes were machine-translated from German.

Garden year

HarvestSep–Oct

Soil & site

Soil pH

4.0pH 4–58.0

Soil type

humus-rich, moist, well-drained, lime-avoiding, lean

LightFull sun
Hours of sunat least 6 h a day
HardinessHardy
Water needHigh

Cranberries need strongly acidic soil that is permanently, evenly moist but never waterlogged. Dig the bed out deeply and fill it with ericaceous compost (bog bed or rhododendron compost). Ordinary garden soil is usually too limy and therefore unsuitable; a tub of ericaceous compost works just as well. Keep the surface mulched so that moisture is retained and the pH stays low; lime in the soil or in the water immediately triggers chlorosis.

Feeding

Light feeder

Months

Mar–Apr

Feeding stays very restrained, because too much nitrogen drives leaf growth at the expense of fruit. In early spring, scatter a thin layer of acidic organic material such as rhododendron compost or well-rotted leaf mould shallowly around the plants without digging it in, because the roots are shallow and delicate. In a pot, repotting every two to three years into fresh ericaceous compost is enough instead of annual feeding.

Overwintering

The cranberry is evergreen and gets through the winter in the lowlands of Germany, Austria and Switzerland in the bed without protection. A layer of mulch keeps the soil evenly moist. In a container, place the pot sheltered against the house wall, insulate it from the outside and water only on frost-free days; more dangerous than winter are late frosts, which in prolonged frost you keep off the flowers with horticultural fleece.

Propagation

Methods

  • Cuttings
  • Layering
  • Runners

The most reliable ways to propagate cranberries are these three. Cuttings (July/August): cut semi-ripe shoots 8 to 10 cm long, insert them about 5 cm deep in peat-based seed compost (pH 4.5 to 5.5) and keep the soil evenly moist. Covering with film or a mini greenhouse raises the humidity and clearly improves rooting success. Be patient, because cranberry cuttings root rather slowly. Layering (June/July): bend a low, still flexible shoot down to the ground, fix it with a stone or a staple and cover the middle of the shoot with soil. Once the layer has formed roots of its own after a few weeks, separate it from the parent plant and replant it. Runners: mature cranberry plants produce creeping ground runners that root by themselves at the nodes as soon as they touch the soil. You can cut these rooted runners off with scissors in spring or autumn and plant them in a new spot. What matters is that the new site is kept moist until the plant has established. For all methods: cranberries need acidic soil (pH 4.5 to 5.5) and do not like drought. Sowing is not worthwhile in the home garden: the seedlings turn out very uneven, germinate unreliably and need many years to the first harvest.

Companion planting

Companion planting is partly traditional gardening lore. Where the reason is known, it is given.

For your garden

Grow Cranberry yourself

Gartenkern tells you when frost is coming, when to sow and when to harvest, for your location.

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