Carob (Ceratonia siliqua) - How to Grow & Care Guide

Plant Snapshot

Common Name: Carob
Latin Name: Ceratonia siliqua
Hardiness Zones: USDA zones 9–11 recommended. In protected, mild sites trees may survive brief colder weather but are prone to frost damage below zone 9.
Typical Height: Typically 20–40 ft (6–12 m) in cultivation, occasionally taller in ideal Mediterranean sites
Typical Spread: Spread commonly 20–40 ft (6–12 m) forming a broad, rounded crown
Bloom Period: Late spring to early summer in Mediterranean climates
Soil Preferences: Prefers well drained soils and tolerates poor, dry and alkaline soils. Avoid waterlogged or heavy clay that stays wet.
Light Preferences: Full sun for best flowering and fruiting. Will tolerate light shade but performance and pod set decline.
Toxicity: Pods and seeds are edible for humans and used as food. Carob is not listed as toxic to dogs and cats by the ASPCA but always check for additives in processed carob products.
Propagation: Seed with scarification or hot water soak to break hard seed coat. Grafting used for named cultivars. Semi-ripe cuttings root with difficulty and benefit from rooting hormone.

Key Facts

Evergreen Mediterranean tree in the pea family Fabaceae
Grown for sweet edible pods used as a cocoa substitute and for locust bean gum
Drought tolerant once established and suited to warm, dry climates
Prefers full sun and well drained soils and tolerates alkaline and poor soils
An ornamental shade tree with dense evergreen foliage
Usually slow to moderate growing and long lived
Flowers are produced in spring and develop into long pods that ripen by late summer or autumn

Carob (Ceratonia siliqua) is an evergreen Mediterranean tree grown for sweet edible pods and dense shade. It suits warm dry gardens and becomes drought tolerant once established but will not survive regular waterlogging or hard frosts in cool climates.

Identification and key traits

Carob has dense evergreen foliage and a broad rounded crown commonly reaching 20 to 40 feet in cultivation. It belongs to the pea family Fabaceae and produces spring flowers that develop into long sweet pods which ripen by late summer or autumn.

Best uses and where to grow

Use carob as a specimen shade tree in warm, dry landscapes where full sun is available. It tolerates poor and alkaline soils and is well suited to Mediterranean climates in USDA zones 9 to 11 rather than colder, frost-prone regions.

Planting and spacing

Plant carob where it has room to form a broad canopy. Expect a mature spread of roughly 20 to 40 feet so space multiple trees accordingly to avoid overcrowding. Choose a sunny site with good drainage to reduce the risk of root decline.

Soil sun and watering

Carob prefers full sun and well drained soil and tolerates alkaline and poor soils. Once established it is drought tolerant but supplemental irrigation increases growth and pod production. Avoid heavy clay or standing water because poor drainage leads to root problems.

After flowering and pruning

Flowers appear in late spring and pods ripen by late summer or autumn in Mediterranean climates. Light pruning shapes the crown and controls spread while heavy cuts may slow establishment. Remove any frost damaged wood promptly to encourage healthy regrowth.

Propagation and cultivars

Seed propagation is common and seeds benefit from scarification or a hot water soak to break the hard coat. Grafting is used to propagate named cultivars and semi ripe cuttings can root with difficulty and rooting hormone. Success varies by clone and local conditions.

Pests safety and harvesting

Carob pods and seeds are edible and used as a cocoa substitute and for locust bean gum. The species is not listed as toxic to dogs or cats by major pet poison registries but processed products may contain ingredients that are harmful to pets. Harvest pods when fully ripe and dry for best flavor.

Frequently asked questions

How fast does Carob grow?: Carob is usually slow to moderate growing and can take several years to reach a substantial shade canopy.
Can I grow Carob in a container?: Carob typically reaches 20 to 40 feet so it is not well suited to long term container culture and performs best planted in the ground.
Is Carob safe for pets?: Carob pods are not listed as toxic to dogs or cats by the ASPCA but prepared products may include chocolate or other additives that are toxic to pets.
What soil does Carob need?: Choose well drained soil. Carob tolerates sandy to loamy and alkaline soils but dislikes waterlogged conditions which cause root decline.
When do carob trees flower and fruit?: Flowers appear in spring and pods develop to ripeness by late summer to autumn in Mediterranean climates, with regional variation.