Plants

balsa

Ochroma pyramidale (Cav. ex Lam.) Urb.

Family: Malvaceae · Genus: Ochroma

balsa wood

Secondary I High Mulch biomass 🪓 Coppices after cutting

Fast-growing pioneer neotropical tree — reaches 20 m in 5 years. IPOEMA cites pau-de-balsa among fast-growing prune-tolerant species, alongside eucalyptus, ideal for the Secondary 1–2 stage (up to 15 years). Lightest commercial timber on the market, used for model-making, insulation and surfboards. Excellent transient shader and biomass producer in SAFs.

Götsch succession

Götsch stage: Secondary I
Ecological role: Early secondary
Primary stratum: High
Strata: High, Emergent
Biomass class: Mulch biomass

Environment

Light requirement: Full sun
Water requirement: High
Drought tolerance: Low
Waterlogging tolerance: None
Soil pH range: 5–8
Preferred soil texture: Loamy
Frost tolerance: 5.0 °C

Morphology

Mature height: 15–30 m
Recommended spacing: 4–6 m
Growth rate: Very fast
Lifespan: 15–30 years
Productive lifespan: 8 years

Biomes & climate

Amazon Native
Atlantic Forest Native

Köppen classes

Tropical rainforest (Af) Suitable
Tropical monsoon (Am) Suitable
Tropical savanna with dry winter (Aw) Suitable

Where it fits in a guild

Balsa takes the High stratum in the Secondary I phase of succession — in a guild it shares the line with species from the other strata, each harvesting light at its own height, in its own time.

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🪴 Cultivation

A short-lived, light-demanding pioneer that needs constant moisture and does not tolerate waterlogging (roots suffocate in saturated clay). Deep, fertile, well-drained soil (pH 5.5–6.5, tolerates 5–8); rainfall 2,500–3,000 mm (tolerates 1,500–4,000; up to 4 months dry if humidity stays high). Hard-testa seeds need heat scarification (boiling water/fire); germination 65–75% in 6–28 days, viable several years. Reaches 20 m and 60 cm diameter in 7 years; wood deteriorates after 12–15 years.

❓ Frequently asked questions

What spacing is recommended for balsa?

The recommended spacing for balsa is 4–6 m.

How tall does balsa grow?

At maturity, balsa reaches 15–30 m tall.

What stage and stratum does balsa occupy in a syntropic system?

In a syntropic system, balsa belongs to the secondary i stage, occupying the high stratum.

Functions

Timber 🌿 Biomass producer

Propagation

Seed

Citations

Wendling, A. (2014) — Curso de Capacitação em Jardins Agroflorestais, IPOEMA / Instituto de Permacultura , p. 38 (growth_rate, pruning_tolerance, gotsch_stage)
Useful Tropical Plants — Ochroma pyramidale (ph_min, ph_max, frost_tolerance_c, water_need, growth_rate, lifespan_years_min, lifespan_years_max, propagation, waterlogging_tolerance, cultivation_notes)
PFAF Plant Database — Ochroma pyramidale (ph_min, ph_max, growth_rate, propagation, waterlogging_tolerance, cultivation_notes)