Loquat

The loquat is indigenous to the mountainous regions of southeastern China, particularly the provinces of Sichuan, Yunnan, Hunan, and Guangdong, where it has been cultivated since at least the Tang Dynasty (618–907 CE).

• Historical records in Chinese agricultural texts, such as the 'Bencao Gangmu' (Compendium of Materia Medica, 1578), document its use as both a fruit and a medicinal plant
• Introduced to Japan around the 8th–11th century, where it became deeply embedded in horticultural culture and acquired the Japanese name 'biwa'
• Brought to Europe by Jesuit missionaries and traders in the 18th century; first planted in the Royal Botanic Garden at Kew, England, around 1787
• Spread to the Mediterranean region, California, Florida, and Australia during the 19th century
• Today, major commercial producers include Japan, China, Spain, Turkey, Brazil, and Israel

The loquat is a medium-sized evergreen tree, typically reaching 5–10 m in height with a rounded, dense crown.

Trunk & Bark:
• Trunk is relatively short, usually 10–15 cm in diameter
• Bark is grey-brown, slightly rough, and may develop shallow fissures with age

Leaves:
• Large, alternate, simple, oblong-lanceolate, 10–25 cm long (occasionally up to 30 cm) and 3–8 cm wide
• Upper surface is dark green, glossy, and leathery; lower surface is densely covered with fine, soft, rusty-brown tomentose (woolly) hairs
• Margins are serrate (toothed), particularly toward the apex
• Prominent parallel lateral veins (12–15 pairs) are visible on the underside

Flowers:
• Produced in terminal panicles (clusters) of 10–20 cm, typically blooming from autumn to early winter (October–February in the Northern Hemisphere)
• Individual flowers are ~1–2 cm in diameter, white, fragrant, with 5 petals and numerous stamens
• The sweet fragrance attracts pollinators including bees and other insects

Fruit:
• A pome (like apples and pears), round to oval, 3–5 cm long
• Skin is smooth to slightly fuzzy, ripening from green to yellow or orange
• Flesh is juicy, sweet to sub-acid, white to deep orange depending on cultivar
• Contains 1–5 large, brown, glossy seeds (seeds are not edible)
• Fruit ripens in late winter to early spring (March–May in the Northern Hemisphere)

The loquat thrives in subtropical to warm-temperate climates and is well adapted to a range of environmental conditions.

Climate:
• Prefers mild winters and warm summers; tolerates brief frosts down to approximately −10°C, though flowers and young fruit are damaged below −3°C
• Requires a period of cool weather (but not severe cold) to initiate flowering
• Performs best in USDA hardiness zones 8–10

Soil:
• Adaptable to a wide range of soil types, from sandy loams to clay
• Prefers well-drained, slightly acidic to neutral soils (pH 6.0–7.0)
• Tolerant of moderate salinity and urban pollution

Pollination:
• Flowers are primarily insect-pollinated (entomophilous), with honeybees being the most common pollinators
• Some cultivars are self-fertile, but cross-pollination generally improves fruit set and size

Ecological Role:
• Provides nectar and pollen to pollinators during autumn and winter when few other plants are in bloom
• Fruits are consumed by birds and mammals, which aid in seed dispersal

Loquat fruits are a good source of several vitamins, minerals, and bioactive compounds.

Per 100 g of raw loquat fruit (approximate values):
• Energy: ~47 kcal
• Carbohydrates: ~12 g (primarily sugars: fructose, glucose, sucrose)
• Dietary fiber: ~1.7 g
• Vitamin A (as beta-carotene): ~1528 IU (significant source; the orange-fleshed varieties are especially rich)
• Vitamin C: ~1 mg (modest)
• Potassium: ~266 mg
• Calcium: ~16 mg
• Phosphorus: ~27 mg

Phytochemicals:
• Rich in carotenoids (beta-carotene, violaxanthin, neoxanthin) — responsible for the orange flesh color
• Contains triterpenic acids (ursolic acid, oleanolic acid) in leaves and fruit
• Leaves contain amygdalin (a cyanogenic glycoside), which is also present in seeds

Loquat seeds and, to a lesser extent, unripe fruit contain amygdalin, a cyanogenic glycoside that can release hydrogen cyanide (HCN) when metabolized.

• Ingestion of large quantities of crushed or chewed seeds may cause cyanide poisoning
• Symptoms of mild cyanide toxicity include headache, dizziness, nausea, and vomiting; severe cases can be life-threatening
• The flesh of ripe fruit contains negligible amounts of amygdalin and is safe to eat
• Leaves also contain amygdalin and should not be consumed in large quantities without proper preparation
• Traditional preparations of loquat leaf tea (used in Chinese and Japanese medicine) involve drying and processing, which reduces cyanide content

The loquat is a relatively low-maintenance fruit tree suitable for home gardens and orchards in warm-temperate to subtropical climates.

Light:
• Full sun is ideal for maximum fruit production and sweetness
• Tolerates partial shade but fruit yield and quality may be reduced

Soil:
• Well-drained, loamy soil with moderate organic matter
• Avoid waterlogged or poorly drained sites

Watering:
• Moderate water requirements; drought-tolerant once established
• Regular irrigation during fruit development improves fruit size and quality
• Avoid overwatering, which can lead to root rot

Temperature:
• Optimal growing temperature: 15–30°C
• Flowers and young fruit are frost-sensitive; protect or site in frost-free locations

Fertilization:
• Apply a balanced fertilizer (e.g., NPK 10-10-10) in early spring and after harvest
• Avoid excessive nitrogen, which promotes vegetative growth at the expense of fruiting

Pruning:
• Minimal pruning required; remove dead, diseased, or crossing branches
• Light thinning of fruit clusters can improve individual fruit size

Propagation:
• Commonly propagated by seed (but seedlings may not true to type and take 6–8 years to fruit)
• Grafting onto seedling rootstock is the standard commercial method
• Air layering (marcotting) is also effective for home growers

Common Problems:
• Fire blight (Erwinia amylovora) — a bacterial disease affecting Rosaceae; prune infected branches promptly
• Loquat scab (Fusicladium eriobotryae) — causes dark spots on fruit and leaves
• Fruit fly infestations — bagging individual fruit clusters can provide protection
• Birds feeding on ripe fruit — netting may be necessary

The loquat has a wide range of culinary, medicinal, and ornamental uses.

Culinary:
• Fresh fruit is eaten raw, often peeled and deseeded
• Used in jams, jellies, preserves, and chutneys
• Made into fruit juice, syrups, and liqueurs (e.g., Japanese 'biwa shu')
• Cooked in pies, tarts, and compotes

Medicinal (Traditional):
• In Traditional Chinese Medicine (TCM), loquat leaves (Pi Pa Ye) are used to relieve coughs, reduce phlegm, and soothe the stomach
• Loquat leaf extract is a common ingredient in herbal cough syrups and throat lozenges in East Asia
• Research has investigated anti-inflammatory, antioxidant, and antidiabetic properties of loquat leaf and fruit extracts

Ornamental:
• Valued as an ornamental landscape tree for its bold, tropical-looking evergreen foliage
• Suitable for hedges, screens, and container planting in mild climates

Timber:
• Wood is hard and fine-grained; occasionally used for small carved objects and tool handles in traditional craftsmanship