Annatto

A tropical shrub whose bright red seeds are the source of a natural food coloring and mild peppery seasoning used in Latin American and Filipino cooking. Annatto paste and powder color rice, cheeses, and stews with a golden-orange hue. Grow in frost-free climates or as a large container specimen brought indoors in winter.

Annatto seeds have a hard coat that requires pre-treatment for successful germination. Soak seeds in warm water (120°F initially, then cooling naturally) for 24-48 hours before sowing. Alternatively, scarify the seed coat lightly with sandpaper. Plant seeds half an inch deep in moist, well-draining seed-starting mix and maintain temperatures of 75-85°F. Germination is irregular, occurring over 2-6 weeks. Provide bright indirect light and keep soil consistently moist but not waterlogged. Transplant seedlings when they have 4-6 true leaves and are 8-12 inches tall. Harden off gradually before planting outdoors in frost-free locations.

The Season Plate

Your Annatto Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Annatto Apr – Jun, pick Sep – Nov. Set your climate below and every date on this plate re-times itself.

Sowing window

Apr – Jun

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Apr 15

≈ 365 days from sowing · 20 to per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Annatto reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

Annatto (Bixa orellana) is a tropical evergreen shrub or small tree that requires frost-free conditions and warm temperatures year-round to thrive. Start seeds indoors by soaking them in warm water for 24-48 hours to soften the hard seed coat, then plant half an inch deep in a warm, moist seed-starting mix. Germination is slow and irregular, taking 2-6 weeks at temperatures of 75-85°F. Transplant seedlings to their final location when they are 8-12 inches tall and all frost danger is completely past.

In tropical climates (zones 10-12), plant annatto in full sun with protection from strong winds. The shrub grows 10-20 feet tall and develops a rounded canopy with heart-shaped leaves. Space plants 8-10 feet apart to allow full development. In temperate climates, grow in large containers (minimum 15-gallon) that can be moved indoors before temperatures drop below 50°F.

Annatto is relatively low-maintenance once established. Water deeply but allow the top few inches of soil to dry between waterings. The plant produces attractive pink or white flowers followed by spiny red seed pods that contain 30-50 seeds each, covered in the bright orange-red pigment that gives annatto its value as a natural dye and food coloring.

In tropical agroforestry systems, annatto grows well as an understory or border plant alongside taller trees like coconut, mango, and avocado. Its dense canopy provides shade for lower-growing crops such as ginger, turmeric, and taro. Plant annatto as a windbreak or living fence in tropical gardens. The flowers attract native pollinators and beneficial insects. Avoid planting in waterlogged areas or in dense shade beneath heavy canopy trees, as reduced light significantly impacts pod production.

The Society Table

Lemongrass belongs beside it.

Old growers' knowledge, checked against Annatto's real companion table below — test any plant you're growing.

Grows well in the company of · 2

LemongrassThai Basil

Keep apart · 0

no recorded foes

Plant Annatto with good neighboursThe planner flags conflicts before they're in the ground

Annatto thrives in well-drained, moderately fertile tropical soils with a pH of 5.5-7.5. It tolerates a wide range of soil types including sandy, loamy, and laterite soils common in tropical regions. Apply a balanced slow-release fertilizer (10-10-10) three times per year during the growing season. Supplement with potassium-rich fertilizer during flowering and fruiting for better pod production. Mulch heavily around the base with organic matter to retain moisture and suppress weeds. Avoid waterlogged soils, which cause root rot in this species.

Ideal Temperature

Hardiness Zone Compatibility

Annatto seed pods are ready for harvest when they turn from green to deep red-brown and begin to split open, typically 4-5 months after flowering. Cut pod clusters with pruning shears, leaving a short stem attached. Harvest in dry weather to prevent mold. Crack pods open and remove seeds, which are covered in the bright orange-red bixin pigment. Spread seeds on trays to dry in a warm, well-ventilated area for 5-7 days. A mature shrub can produce several pounds of seeds per year. Handle carefully, as the red pigment stains hands, clothing, and surfaces readily.

Storage & Preservation

Store dried annatto seeds in airtight glass jars in a cool, dark place where they maintain color and flavor for up to three years. To extract the pigment for cooking, heat seeds gently in oil or lard until the oil turns deep orange, then strain out the seeds. This infused oil stores well in the refrigerator for several months. Seeds can also be ground into powder using a spice grinder, though the hard seeds require a powerful grinder. Annatto paste, made by soaking and grinding seeds with vinegar and spices, keeps for months under refrigeration.

Troubleshooting Common Problems

Cold sensitivity is the primary challenge for growers outside the tropics; annatto suffers damage below 50°F and dies at freezing temperatures. Container-grown plants may become root-bound and decline if not repotted every 2-3 years. Poor fruiting in indoor or greenhouse specimens results from insufficient light and lack of pollinators; hand-pollinate flowers with a small brush. Leaf drop during winter in temperate climates is normal when plants are brought indoors, but excessive drop indicates insufficient light or sudden temperature changes.

Growing Tips

1. Soak annatto seeds in warm water for 24 hours before planting to soften the hard seed coat and significantly improve germination rates, which can otherwise be as low as 30 percent.
2. Plant in a location that receives full sun for at least 6 to 8 hours daily, as annatto requires abundant light to produce flowers and set fruit reliably.
3. Ensure well-draining soil with a pH between 5.5 and 7.0. Annatto tolerates a range of soil types but performs best in fertile loamy or sandy-loam soils enriched with organic matter.
4. Provide consistent moisture during the first two years of growth, watering deeply once or twice per week. Established trees are moderately drought-tolerant but produce best with regular irrigation.
5. Protect young trees from temperatures below 10 degrees Celsius, as annatto is frost-sensitive. In borderline climates, grow in large containers that can be moved indoors during cold snaps.
6. Apply a balanced organic fertilizer three times per year: at the start of the growing season, during flowering, and after harvest. Supplement with potassium-rich feeds during fruit development.
7. Prune annually after harvest to remove dead wood, thin the canopy for better air circulation, and maintain a manageable tree height of 3 to 4 meters for easier pod collection.
8. Watch for common pests including pod borers, scale insects, and mealybugs. Encourage natural predators such as ladybugs and lacewings, and use neem oil sprays for persistent infestations.
9. In non-tropical climates, annatto can be grown as an ornamental container plant. Use a large pot with excellent drainage and bring indoors when nighttime temperatures drop below 12 degrees Celsius.
10. Harvest pods when they turn brown and begin to crack open naturally. Dry seeds in the sun for 3 to 5 days on clean screens or trays, turning them daily to ensure even drying.