Seedling Survival Rates and Replanting Budgets

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

Seedling survival rate in reforestation: what drives mortality in Indonesia, how to measure survival, and how to budget replanting realistically.

Seedling survival in reforestation varies widely by species, site, planting season and aftercare, so a credible project measures survival from its own pilot and monitoring data and budgets replanting accordingly. Survival is one of the biggest drivers of both carbon delivered and cost, and it is where optimistic plans fail most often.

What drives mortality

Species choice matters a great deal. See species selection for ARR.

Nursery practices that pay off

• Source seed from known, local, diverse parent trees.
• Grade seedlings and plant only those meeting size, root and health standards.
• Harden off seedlings by reducing shade and water before dispatch.
• Plan production with a surplus for replanting.
• Keep nursery records: batch, species, seed source, sowing date, dispatch date. These help explain survival differences later.
• Consider village or farmer nurseries for local species; they cut transport damage and build ownership.

Measuring survival properly

1. Define what counts as alive. Green leaves or buds; record “dead”, “missing”, “damaged”, “replanted”.
2. Use fixed sample plots or a full census. For small farms, a census by farmers with photo evidence works; for larger areas, permanent sample plots.
3. Measure at fixed intervals, for example 3, 6 and 12 months, then annually.
4. Record cause of death where visible.
5. Track replanted trees separately, with their own planting date.
6. Use drones for fast survival counts in open, young plantings. See drone photogrammetry.

Survival rate = live trees / trees planted, per stratum and species. Report both cohort survival and current stocking density.

Budgeting replanting

Build replanting into the ARR project cost model as an explicit line:

• Expected mortality by species and site from pilot data, or a conservative assumption until you have it.
• Seedlings, transport, labour and maintenance for replanting.
• Timing: usually the next planting season, sometimes two rounds.
• Contingency for bad years: drought or fire can raise mortality sharply across a whole cohort.

Then feed realistic stocking into ex-ante carbon estimation. Removals from replanted trees start later, so do not assume replanting fully restores the original growth curve.

Survival targets in contracts and finance

Buyers and investors increasingly link payments to survival or stocking milestones. Set milestones on realistic, measured values, define how survival is measured and by whom, and allow for replanting windows. Independent checks on a sample protect both sides. Avoid contracts that pay per seedling distributed: they reward the wrong outcome.

Assisted natural regeneration as an alternative

Where remnant trees, seed sources and rootstock exist, assisted natural regeneration (protecting and releasing naturally regenerating trees) can achieve high stocking at lower cost and with naturally adapted species. It requires fire and grazing control and patience. Methodologies may treat it differently from planting, so check applicability before mixing approaches.

Common mistakes

• Reporting seedlings distributed as trees planted, and trees planted as trees surviving.
• One survival check at three months, never repeated.
• Replanting without recording it, which hides true mortality.
• Ignoring survival differences between species and planting groups.
• No budget for maintenance after year one.
• Planting at the end of the rains to meet a target date.

What good evidence looks like

A verifier and buyer will want: nursery records; planting records by plot and date; the survival protocol; monitoring data by interval, species and stratum with photos and locations; replanting records; and analysis of causes. Consistency between planting records, monitoring data and the carbon model is key.

Indonesia specifics

Seasonal regions such as Nusa Tenggara, parts of Sulawesi and eastern Java have long dry seasons that test seedlings hard. El Niño years bring drought and fire across Sumatra and Kalimantan. Mangrove planting faces wave action, barnacles and wrong tidal positioning. Many projects find that farmer-valued fruit and multipurpose trees survive better than species farmers do not want. Agree on fire management with villages early.

Our field data campaigns service designs and runs survival monitoring. See the ARR hub for the wider project process.