Phenology Walk – Achiote

Achiote (Bixa orellana)

Family: Bixaceae
Origin: Native to the Caribbean and parts of Central America
Garden location: 17°42’58.30″N, 64°49’46.20″W
ArbNet Level II list: No
POWO Status: Tree
IUCN Red List threat level: Least Concern

Region

  • Native to tropical Central and South America
  • Widely cultivated throughout:
    • The Caribbean
    • Tropical regions of Africa and Asia
  • Thrives in:
    • Warm, humid climates
    • Low to mid elevations
  • Well-suited to conditions in St. Croix (USVI), where it grows readily in cultivated landscapes and gardens.

Phenology Markers

Overview

Achiote (Bixa orellana), also known as Annatto or Lipstick Tree, is a small tropical tree or large shrub valued for its vibrant seed pods, which produce the natural dye annatto. At the Garden, it is an eye-catching species due to its soft pink flowers and striking, spiny red fruit capsules.

Growth Habit

  • Small tree / large shrub
  • Typically 6–20 feet in height
  • Open, somewhat irregular canopy
  • Rapid grower under favorable conditions

Leaf Phenology

  • Leaves are broad, heart-shaped (cordate) with long petioles
  • Generally evergreen in tropical climates
  • New leaf flush appears:
    • As lighter green, soft, slightly drooping foliage
    • Often following rainfall or periods of active growth
  • Mature leaves deepen to a darker green and become more rigid

Marker:
Look for contrast between pale new growth and darker mature leaves.

Flowering Phenology

  • Produces clusters of soft pink to pale lavender flowers
  • Flowers have:
    • Five delicate petals
    • A dense cluster of prominent stamens (often yellow to pinkish)
  • Blooming may occur:
    • Intermittently throughout the year
    • Often in response to favorable moisture and warmth
  • Individual flowers are short-lived, often lasting only a day

Markers:

  • Bud formation in tight clusters at branch tips
  • Sudden appearance of multiple open blooms
  • Petal drop within 24 hours, leaving developing ovary

Fruiting Phenology

  • Fruit develops into spiny, heart-shaped capsules
  • Capsules transition:
    • Green → Red (or reddish-brown when mature)
  • When mature, pods:
    • Dry and split open
    • Reveal numerous bright red seeds
  • Seeds are coated in the annatto pigment

Markers:

  • Early: small green, textured pods
  • Mid-stage: swelling, color shift toward red
  • Mature: dry capsule beginning to split
  • Late: exposed seeds or empty pods

Seasonal Notes (St. Croix Context)

  • Growth and flowering are often tied to rainfall patterns
  • More vigorous activity may follow wetter periods
  • Can show overlapping stages:
    • Flowers, immature fruit, and mature pods present simultaneously

Marker:
Achiote often displays multiple phenological stages at once—an excellent teaching specimen.

Ecological & Cultural Notes

  • Seeds historically used for:
    • Natural dye (annatto)
    • Food coloring and flavoring
  • Attracts pollinators, especially bees
  • Adds visual interest due to:
    • Soft floral display
    • Bold fruit coloration

Phenology Tracking Notes (Garden Use)

  • Ideal for documenting:
    • Rapid transitions from flower → fruit
    • Color change in capsules
    • Seed exposure timing
  • Good candidate for:
    • Educational walks (clear visual markers)
    • Demonstrating tropical, non-seasonal phenology patterns

Suggested Photo Markers

For your page layout, you might include:

  1. New leaf flush (light green, soft leaves)
  2. Flower cluster (fresh bloom)
  3. Flower detail (stamens prominent)
  4. Early fruit (green, spiny)
  5. Mature fruit (red capsule)
  6. Open pod with seeds visible
Scroll to Top