How to Grow Cranberries | Soil, pH & Growing Guide

Soil & Growing Conditions

Water: Keep moist all year round; genuinely boggy conditions suit it well (RHS). Needs shelter from strong winds (PFAF).

Soil pH range

4 4.5

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Quick Facts

Factor	Value
Soil pH	4 - 4.5
Sunlight	6-8 hours direct sun
Minimum survivable temp	-20C
Soil texture	Loam or sand (RHS); peaty or light loam with leaf-mould preferred (PFAF)
Drainage	Well-drained or moist but well-drained, suited to boggy conditions (RHS); PFAF says moist or semi-boggy and dislikes drying out
Lifecycle	Evergreen shrub. RHS records 10-20 years to reach maturity; PFAF gives a considerably faster timeline of about 5 years to come into full bearing, after which it can crop for 60-100 years.
Edible parts	fruit

At a Glance

Growth Stages

Stage	BBCH	Notes
Planting and establishment	0	Propagate by softwood cuttings in late spring or semi-ripe cuttings in early summer (RHS); PFAF adds seed (needing about 3 months cold stratification), layering (about 18 months) and spring or early-autumn division of suckers as alternatives. Needs permanently moist, lime-free, acidic soil (pH 4-4.5) -- becomes chlorotic if lime is present (RHS; PFAF).
Vegetative spread	3	Long, slender, creeping stems root into the soil as they spread, forming a low, prostrate mat; upright flowering stems develop from the second year onward (RHS; PFAF). Nutritionally poor soil is tolerated well and can actually favour fruiting over excess foliage growth (PFAF).
Flowering	6	PFAF records flowering from June to August.
Fruiting and harvest	8	Productive fruiting begins by the third year (RHS); berries mature from September through early winter and should be picked before the first frost (RHS). Bird protection with netting may be needed.

Harvest & Storage

When to pick: Red fruit, 1-2cm diameter, ripens from September through early winter; pick before the first frost (RHS). The fruit is too acidic for most people's tastes eaten raw and is mainly used cooked, in sauces, pies and preserves (PFAF); it is particularly high in antioxidants and vitamin C (RHS).

Diseases

Lime-induced chlorosis

moderate

A nutritional/abiotic issue, not a pathogen: both RHS and PFAF independently confirm this acid-loving plant becomes chlorotic (yellowing) when grown in soil containing lime, since it cannot access iron and other…

Powdery mildew

low

Named directly on RHS's own growing-guide page as "powdery mildews" (no severity grading given).

Foot and root rot (general)

low

Named directly on RHS's own growing-guide page as "root rot"; recorded against the existing general foot/root rot entity.

Honey fungus

low

Armillaria spp.

Named directly on RHS's own growing-guide page; RHS states this rarely affects the crop.

Pests

Caterpillars (general)

low

Lepidoptera larvae, various spp.

Named directly on RHS's own growing-guide page ("may be susceptible to caterpillars", no species or severity given).

Cranberry Photo Gallery

Dense mat of ripe berries

A dense mat of cranberry plants covered in ripe red berries.

Flower cluster

A cluster of pink cranberry flowers with swept-back petals.

Berry detail

Close-up of a single ripe cranberry on the stem.

Cranberry bog

A cranberry bog landscape.

Ripening on the vine

A ripening cranberry on a trailing vine.

Flowers on the vine

White cranberry flowers on a trailing stem.

Berries across the mat

Many cranberries ripening across a low mat of foliage.

In a garden bed

Cranberry plants with red berries growing in a garden bed.

Flower macro

Macro detail of pink cranberry flowers.

References

1. Plants For A Future (PFAF) - Vaccinium macrocarpon

   Evergreen, UK hardy zone 2. Flowers June-August, seeds ripen August-October. ~5yrs to full bearing, then crops 60-100yrs. Size 0.2m tall x 2m wide, long creeping stems rooting as they spread, upright flowering stems form in year 2. Soil: moist/semi-boggy, lime-free, peaty or light loam with leaf-mould, pH 4-4.5, becomes chlorotic with lime present, tolerates poor soil (favours fruiting over foliage). Full sun or light shade, fruits better in sun, needs moist/wet soil and shelter from wind. Propagation: seed (3mo cold stratification), cuttings (April 15cm or August 5-8cm half-ripe with heel), layering (18mo), division. Edible: fruit 1-2cm, raw/cooked/dried, rich in vitamin C, too acidic raw for most tastes, used in pies/preserves. Medicinal: branch infusion historically used for pleurisy. Native to eastern North America.

2. Royal Horticultural Society - Vaccinium macrocarpon (American cranberry)

   Evergreen prostrate mat-forming shrub, 10-20yrs to maturity. Hardiness H6 (-20 to -15C). Soil: loam/sand, acidic, well-drained or moist but well-drained, boggy-suited, keep moist year-round. Full sun to partial shade. Height/spread 0.1-0.5m. Propagate by softwood cuttings late spring or semi-ripe early summer. Pests: caterpillars. Diseases: honey fungus (rarely), powdery mildews, root rot, chlorosis from nutrient deficiency. Native to North America. Edible red fruit in autumn. Family Ericaceae.

2 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.