Loading plant details...
How to Grow Allspice
Learn how to grow Allspice from seed to harvest in 2920 days. Advanced difficulty. Complete nutrient guide, pH/EC requirements, and growing conditions for soil & container.
Backed by 15 peer-reviewed citations.
Temperature
Allspice is a humid-tropical tree rather than a temperate herb. Crop references place suitable growth around 15-32C, with TNAU listing about 27C as ideal; broader Ecocrop-style limits extend roughly 10-35C but should not be treated as a production target. Keep greenhouse or indoor trees warm and avoid chilling, especially during seedling establishment.
Humidity
Published allspice sources describe a humid tropical crop with high and regular rainfall, not a precise relative-humidity crop setpoint. PROSEA gives acceptable rainfall near 1000-2500 mm and an optimum near 1500-1600 mm, while TNAU gives 100-200 cm annual rainfall.
Light
No accepted source gave allspice photoperiod, DLI, or PPFD targets. Seedlings are best handled in humid, shaded nursery conditions, then acclimated to warm outdoor or greenhouse tree conditions.
Airflow
Allspice has no published airflow-rate target, but disease evidence supports avoiding stagnant, persistently wet canopies. Myrtle rust is documented on allspice and is favored by humid, wet conditions, while fruit anthracnose has also been reported in Mexico.
Nutrition
Allspice nutrition evidence is soil and orchard based, not hydroponic ppm based. Extension and crop-reference guidance uses organic matter plus split complete fertilizer, with mature trees receiving much higher potassium than young plants.
Propagation
Propagate allspice from very fresh seed or by skilled vegetative methods. Seed should be removed from ripe fruit and sown promptly because viability drops quickly; sources report germination beginning around 9-15 days, while a seed-viability study found 50% emergence at about 47 days.
Harvesting
Harvest allspice berries when fully mature but still green, before the fruit turns glossy purple-black. PROSEA describes harvest about 3-4 months after flowering, followed by sweating or blanching and sun or artificial drying to about 12% moisture.
Calendar
Calendar timing is tropical and phenology-driven. Sow fresh seed as soon as ripe fruit is available, pot seedlings at the two-leaf stage, and transplant at 9-10 months when plants are about 25-40 cm tall.
Environments
Allspice is best suited to humid tropical or subtropical field, greenhouse, or large-container culture. PROSEA favors well-drained loamy limestone soils, pH 6.3-8.0, and low-elevation warm sites, while UF/IFAS lists the tree for coastal central and south Florida.
System Compatibility
No reviewed academic, extension, FAO, or government source verified allspice production in DWC, NFT, ebb-flow, Kratky, aeroponics, or inert-media drip hydroponics. Verified systems are nursery beds, containers, and field/orchard planting in well-drained media.
Growing Media
Use deep, fertile, well-drained soil or a container mix that behaves like a tree medium, not a saturated hydroponic substrate. PROSEA favors well-drained loamy limestone soils at pH 6.3-8.0, and TNAU lists deep rich loams with high humus and lateritic soils as suitable.
Container Specs
For containers, treat allspice as a woody tropical fruit tree. Use a large, well-drained container, loose tree-style media, and plan for up-potting or root work as the plant grows.
Training & Support
Allspice is a self-supporting evergreen tree and does not require trellising. Stake only young transplants if wind or root-ball instability demands it.
Common Issues
The most important allspice-specific disease signal is myrtle or guava rust caused by Austropuccinia psidii, formerly Puccinia psidii; it attacks young flushes and can cause pustules, lesions, defoliation, and twig dieback. Anthracnose caused by Colletotrichum spp.