Industrial & Crops· Ceratonia siliqua L.

Carob Growing Guide

Carob is a long-lived Mediterranean evergreen tree grown for its dried pods, harvested once a year from late summer into autumn. The pod yields two very different products: the pulp, about 90 percent of pod weight, is milled into carob powder used as a caffeine-free cocoa substitute, while the seed, about 10 percent, is processed into locust bean gum (E410), a hydrocolloid thickener that is the more valuable of the two streams. The species is dioecious, with some hermaphrodite forms, so an orchard must carry male or hermaphrodite pollinizers or it will set almost no pods. It is among the most drought- and heat-tolerant tree crops in commercial use and is usually grown rainfed on shallow, stony or calcareous ground where irrigated alternatives are not viable.

How Long Does Carob Take to Grow?

Carob typically reaches its first harvest about 6 years after planting.

2190

Days to Harvest

3,650

kg dried pods/hectare

low

Water Needs

full sun

Sun Needs

Growing Conditions

Rainfall

250-550 mm/year

Frost Tolerance

light

Drought Tolerance

high

Humidity

low tolerance

Heat Tolerance

high

Soil Requirements

Soil Type & pH

Best soil types: sandy loam, clay loam, calcareous, well-drained loam, shallow stony

pH range: 6.5 - 8

Drainage: good

Nutrient Needs (N-P-K)

Nitrogen (N)low

Phosphorus (P)low

Potassium (K)moderate

Planting Guide

Planting Methods

grafted nursery tree, seed-grown seedling transplant

Plant Spacing

1200 cm apart, 1200 cm rows

Plant Density

69 plants/hectare

Planting Season

fall, spring

Irrigation

Usually none: most orchards are dry-farmed. Complementary drip irrigation through spring and summer becomes necessary once density is pushed above roughly 200 trees per hectare, which also implies mineral fertilization and higher cost.

Yield & Economics

Yield Range

520 - 11,120 kg dried pods/ha

Market Price

EUR 1.36 - 3 per kg dried pods

Market Demand

stable

Profitability

low

Common Pests & Diseases

Common Pests

Carob moth (Ectomyelois ceratoniae)
Leopard moth (Zeuzera pyrina)
Goat moth (Cossus cossus)
Dried fruit moth (Cadra calidella)
Black twig borer (Xylosandrus compactus)
Rodents

Common Diseases

Powdery mildew (Pseudoidium ceratoniae)
Cercospora leaf spot (Pseudocercospora ceratoniae)
Armillaria root rot (Armillaria mellea)
White root rot (Rosellinia necatrix)
Verticillium wilt (Verticillium dahliae)
Botryosphaeria canker and dieback
Bacterial leaf spot (Pseudomonas syringae pv. ciccaronei)

Use AI crop disease detection to identify issues early and prevent crop losses.

Growing Tips

Plant grafted trees of a named cultivar rather than seedlings. Grafted stock on a selected rootstock enters production sooner and gives uniform pod quality, while seed-grown trees are cheaper and hardier but slower and variable in fruit size and quality (agro-r carob cultivation manual, 2025).

Carob is dioecious, so a block of female trees alone sets almost nothing. Interplant male or hermaphrodite pollinizers: Batlle and Tous (1997) recommend about 12 percent of trees, while Gomez-Martinez et al. (2025) found 25-30 percent males maximised orchard-level production in Mallorca. Treat this as a planting-design decision, not an afterthought.

Scarify seed before sowing. A 20-minute sulphuric acid treatment gave 100 percent germination in 4.0 days and hot-water soaking gave 66.7 percent in 5.0 days (Alhjami and Humaid, 2025); untreated hard seed is slow and erratic, so budget weeks rather than days in the nursery if you skip the treatment.

Soil depth and water-holding capacity, not rainfall alone, set the ceiling on dry-farmed yield. Over 30 years the same cultivar averaged 40.3 kg pods per tree on deep calcareous clay-loam versus 7.4 kg per tree on shallow sandy-loam only 7 km away (Correia and Pestana, 2018).

Carob is one of the few tree crops that stays workable on coastal and calcareous ground and under low-quality irrigation water, and it is consistently described as relatively salt tolerant. No FAO-29 style EC threshold or yield-decline slope has been published for it, and the much-repeated claim that it tolerates 3 percent NaCl in the soil carries no stated basis or measurement method, so treat salinity as a site trial rather than a specified limit.

Harvest when pods have turned dark brown to black, feel hard and leathery, and are down to 10-12 percent moisture, generally late August to early October in the northern hemisphere; then air-dry 48-72 hours to about 8 percent moisture or the pods mould in store (agro-r manual 2025; Batlle and Tous 1997).

Expect a long unproductive period. Trees begin fruiting around 6-7 years from planting and yield only stabilises at roughly 20-25 years, so a carob planting is a two-decade commitment and intercropping with almond, fig or olive is common in the establishment phase.

Frequently Asked Questions

How long does Carob take to grow?

Carob typically takes about 6 years from planting to first harvest. The best planting season is fall, spring.

What soil does Carob need?

Carob grows best in sandy loam, clay loam, calcareous, well-drained loam, shallow stony soil with a pH of 6.5-8. Good drainage is required.

What temperature does Carob need?

Carob grows best at -6-45°C. Frost tolerance: light. Heat tolerance: high.

What is the expected yield for Carob?

Across 6 countries with grounded data, reported national yields for Carob range from 520 to 11,120 kg dried pods/hectare, with a median of 3,650. These are national statistics, not a best-case figure — an individual farm's yield depends on variety, climate, soil and management.