Nature Lab/Specimen Collection/West Indian Mahogany
Sp. #04 of 16
SAFE
Botanical Specimen Record
Swietenia mahagoni

West Indian Mahogany

SAFE
Safety Note

Nontoxic. Seeds, pods, and wood are all safe to handle. The sawdust can be irritating if inhaled (as with any wood), but casual handling is fine.

Identification Features
Broad, dense canopy providing deep shade
Compound leaves with 4-8 paired leaflets
Large woody seed pods (4-5 inches) that split open when ripe
Winged seeds that spin like helicopters when they fall
Reddish-brown wood — one of the most valuable timbers in history
Miami-Dade County's official county tree
Can live 200+ years and reach 75 feet tall
Collected Specimens — What Falls
🍃Winged seeds (helicopters) — winter/spring
🍃Large woody seed pods (split open on the tree, shells fall)
🍃Small leaflets (semi-deciduous, drops leaves in dry season)
Field Observations

Miami-Dade County's official tree. A grand, spreading canopy tree that can live for hundreds of years. The wood is legendary — it built the ships, furniture, and cathedrals of the colonial era. But the real magic for kids is the seed pods: they split open to release winged seeds that helicopter down like nature's toys.

— field notes, Miami Beach

Location Index

Where to Find It

Street tree throughout Miami Beach (especially along Meridian Avenue, Pine Tree Drive). Miami Beach Botanical Garden. Flamingo Park. Common in older neighborhoods where mature specimens have had decades to grow.

Ecological Survey

Ecological Role

A native canopy tree of tropical hardwood hammocks. Provides dense shade that cools the understory by 10-15 degrees. The large canopy captures rainfall and reduces erosion. Seeds feed parrots, squirrels, and other wildlife. One of the trees that defines the character of old Miami neighborhoods.

Fun Fact

Mahogany was so valuable during the colonial era that the British Navy logged the entire Caribbean supply for shipbuilding. The HMS Victory (Nelson's flagship at Trafalgar) was built with mahogany. Today, wild West Indian Mahogany is endangered — the street trees in Miami are some of the largest remaining populations.

Field Activities

3 cards
Activity #1

Seed Helicopter Races

All ages (toddlers to adults — everyone loves this)15-20 minutesMess: None

Drop mahogany seeds from a height and watch them spin like helicopters. Race them, time them, modify them. This is how nature designed wind dispersal — and it's endlessly entertaining.

Materials Required

Fallen mahogany seeds (winged, flat, about 2-3 inches long)

Procedure
  1. 1.Collect winged seeds from the ground under a mahogany tree
  2. 2.Hold a seed at shoulder height and release — watch it spin!
  3. 3.Race two seeds side by side — which lands first?
  4. 4.Experiment: does the seed spin faster if you drop it from higher up?
  5. 5.Try gently bending the wing — how does it change the spin?
  6. 6.Discuss: the spinning slows the fall so wind can carry the seed far from the parent tree. This is called 'autorotation' — the same principle helicopters use.
Learning Outcome: Autorotation and aerodynamics. Seed dispersal strategies. Why trees 'want' their seeds to land far away (reducing competition).
Activity #2

Seed Pod Boats

Ages 3+15-25 minutesMess: Low

The woody pod halves float like little canoes. Decorate and race them in a puddle, fountain, or at the water's edge. A zero-waste toy that biodegrades when you're done.

Materials Required

Split mahogany seed pod halves (the woody cup-shaped shell), a leaf for a sail, a twig for a mast

Procedure
  1. 1.Find split seed pod halves on the ground (they look like small wooden boats)
  2. 2.Test it in water — it floats naturally
  3. 3.Add a twig as a mast through a leaf sail
  4. 4.Decorate with small found objects (tiny shells, sand)
  5. 5.Race your boats in a puddle, fountain edge, or calm water
  6. 6.Discuss: many real boats throughout history were built from mahogany for exactly this reason — it's naturally buoyant and water-resistant
Learning Outcome: Buoyancy and density. Why certain woods were used for shipbuilding. Creative problem-solving with natural materials.
Activity #3

Grow Your Own Mahogany Baby

All ages15 min setup, weeks of observationMess: Low

Plant a mahogany seed and watch it germinate over the following weeks. Take it home and grow a tree that could live for 200 years. Parents love this one.

Materials Required

Mahogany seed, small pot or cup with drainage, soil

Procedure
  1. 1.Select a mature seed (brown, firm, not shriveled)
  2. 2.Fill a small pot with soil, press the seed in about half an inch deep with the wing sticking up
  3. 3.Water gently — keep soil moist but not soaked
  4. 4.Place in bright indirect light
  5. 5.Watch for germination in 1-3 weeks
  6. 6.Discuss: this tiny seed contains the blueprint for a 75-foot tree that could live for centuries. Every mahogany tree on every Miami street started as a seed exactly like this one.
Learning Outcome: Germination process. Seed anatomy. Long-term thinking — planting something that will outlive you.
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