Cacao (Theobroma cacao): Growth, Allometry and Carbon Potential

Updated 2026-11-02 · 4 min read · By the akar.earth specialist team

Cacao carbon sequestration in Indonesia: range, productive life, wood density, cocoa-specific allometry, shade-tree agroforestry, EUDR and key risks.

A single cacao tree stores only a small amount of carbon because it is a small understorey tree, but cocoa farms with shade trees can hold substantial carbon. For Indonesian cocoa, the carbon opportunity is in agroforestry: adding and keeping shade and fruit trees around cacao.

Identity and range

Cacao (Theobroma cacao) is in the mallow family, Malvaceae. In Indonesia it is called kakao or cokelat. Planted types include Forastero-type bulk cocoa, Trinitario hybrids and improved clones such as those distributed through national rehabilitation programmes.

Cacao is native to the upper Amazon basin of South America. It came to Indonesia during the colonial period. Today Sulawesi is the heart of Indonesian cocoa, including South Sulawesi, Central Sulawesi, Southeast Sulawesi and West Sulawesi. Other areas include Aceh, West Sumatra, Lampung and parts of Papua and Nusa Tenggara. Production is dominated by smallholders.

Growth habit and rotation

Cacao is a small evergreen understorey tree, usually pruned to 3 to 5 m in farms. It grows naturally under forest shade and does best with partial shade, high humidity and well-drained soil. Pods grow directly on the trunk and main branches.

Trees begin bearing pods after about 2 to 4 years. Productive life is often around 20 to 25 years, after which yields decline and farmers replant or rehabilitate by grafting new clones onto old stems (side grafting). Many Indonesian farms are old and low-yielding, which is why rehabilitation programmes focus on replanting.

Wood density and biomass estimation

Reported basic density for cacao wood is roughly 0.40 to 0.50 g/cm³. Wood density varies with site and age.

Cacao stems often fork low, so DBH at 1.3 m is unreliable. Cocoa-specific allometric equations, including work from cocoa–gliricidia agroforests in Central Sulawesi, usually use stem diameter measured at a lower height, such as 30 cm above ground. If you use one, follow its exact measurement height. The Chave et al. 2014 model:

AGB (kg) = 0.0673 × (ρ × D² × H)^0.976

can be used as a fallback, but it was built mostly from larger forest trees, so treat results for small, pruned cacao with caution. For shade trees, use the generic model or species-specific equations. See our allometric equations guide.

Convert to carbon with the IPCC default 0.47 and to CO2 with 44/12.

Carbon role in ARR and agroforestry

• Shade-tree carbon. Adding shade and fruit trees such as gliricidia (gamal), coconut, durian, candlenut and timber species raises farm carbon stock and can be the basis of an agroforestry project.
• Replanting. Rehabilitating degraded cocoa with improved clones and shade trees can raise yields and carbon at once.
• Insetting. Chocolate and cocoa buyers increasingly fund agroforestry in their supply chains. See cocoa agroforestry carbon.

Under VM0047 and similar ARR methods, new woody biomass on eligible land counts. Cacao replanting cycles must be modelled, but long-lived shade trees carry most of the durable stock.

Co-benefits and livelihoods

Cocoa is a key cash crop for hundreds of thousands of Indonesian households. Shade trees diversify income through fruit, timber and fuelwood, and improve microclimate, soil moisture and resilience to drought.

Risks and cautions

• Pests and disease. Cocoa pod borer (penggerek buah kakao), vascular streak dieback and black pod (Phytophthora) cause major losses in Sulawesi.
• Ageing trees. Old, low-yield farms are at risk of conversion to other crops such as maize or oil palm, which removes trees.
• Full-sun intensification. Removing shade to raise short-term yields cuts carbon and biodiversity.
• EUDR. Cocoa is an EUDR commodity. Exporters must show plots were not deforested after 31 December 2020 and supply geolocation. See EUDR cocoa.

Planning notes for project developers

• Count shade trees separately. Inventory shade and fruit trees by species and DBH, and cacao by stem diameter at the low height your equation uses.
• Model rehabilitation cycles. If cacao is replanted or side-grafted during the crediting period, its biomass drops temporarily. Shade trees smooth this.
• Use one dataset. The same farm polygons and tree records can serve carbon monitoring and EUDR due diligence; see one dataset for carbon and EUDR.
• Aggregate smallholders. Cocoa farms are small, so projects usually group many farmers.

Worked example

A mature cacao tree with stem diameter 10 cm, height 5 m and wood density 0.42 g/cm³ (Chave model, for illustration):

1. ρ × D² × H = 0.42 × 100 × 5 = 210
2. AGB = 0.0673 × 210^0.976 ≈ 12.4 kg
3. Carbon = 12.4 × 0.47 ≈ 5.8 kg C
4. CO2e = 5.8 × 44/12 ≈ 21 kg CO2e (above-ground only)

One large shade tree can hold more carbon than dozens of cacao trees. Test both in the tree CO2 calculator.