The planting window can be as short as seven weeks.
In tropical restoration, viable planting conditions depend on the rainy season. Seeds need consistent moisture to germinate. Seedlings need sustained rainfall to establish root systems before the dry season. In the Atlantic Forest region of São Paulo state, that window typically runs from late October to mid-December. Seven to ten weeks where conditions align. Before and after, the risk of establishment failure climbs steeply.
Everything in a restoration project works backward from that window.
The chain before the first seed
Before planting can begin, a sequence of pre-activities must be completed, in order, with no step skippable.
Vegetation control comes first. Invasive grasses - brachiaria in the Atlantic Forest, colonião in transitional zones - must be cleared or suppressed. Depending on coverage and root depth, this requires mechanical clearing, selective herbicide application, or both. On heavily invaded sites, multiple rounds may be needed, spaced weeks apart to catch regrowth.
Soil preparation follows. On former pastureland, four to five disk harrowings may be necessary to break compacted root mats. On steeper terrain, subsoiling replaces disking. The soil must be workable before seeds or seedlings go in - compacted ground means failed germination, regardless of species selection or planting method.
Access preparation runs in parallel. Equipment staging areas need to be cleared. Access roads must be passable - and in tropical conditions, a road that works in July may be impassable by November without maintenance. Seed supply chains must be confirmed: the right species mix, in the right quantities, with verified viability, delivered to the right zone at the right time.
Pest control cannot wait. Leaf-cutter ant colonies near planting zones can destroy seedlings within days of emergence. Bait application must be completed before planting, and monitoring must continue through the establishment period.
"People see the planting day as the starting line. It is actually the finish line of months of preparation. If any link in that chain breaks, the planting day does not happen." - Pedro Bevilaqua, Environmental Engineer, MORFO
What causes delays
The most common cause of delay is underestimating soil preparation time. A diagnostic may show that the soil needs three passes of disk harrowing. But when the crew arrives, they find compaction deeper than expected, or a laterite layer that requires subsoiling first. The three passes become five. The timeline shifts by two to three weeks.
The second most common cause is incomplete diagnostics. If the field campaign did not cover enough of the site, or if the diagnostic was done too far in advance, conditions may have changed. New invasive growth. Erosion from an unexpected rain event. An access road degraded beyond use. Each surprise adds days or weeks.
Logistics failures compound everything. Equipment breakdowns when specialized machinery is shared across zones. Seed deliveries delayed because the supplier's own harvest was late. Crew availability disrupted by competing demands - in some regions, coffee harvest season overlaps with restoration pre-activity timelines, pulling labor away from the project.
And weather itself is unpredictable within the predictable. The rainy season will come - but it may start two weeks early, turning access roads to mud before soil preparation is complete. Or it may start late, compressing the viable planting window from ten weeks to six.
The cascade
A one-week delay on vegetation control does not cost one week. It costs the time it takes for that delay to propagate through soil preparation, seed logistics, and crew scheduling. By the time the cascade reaches the planting window, that one week may have become three.
If pre-activities are not complete when the window opens, the project faces a binary decision: plant on partially prepared ground and accept lower establishment rates, or defer the zone to the next season.
Planting on unprepared soil is almost always the wrong choice. Establishment rates on compacted or poorly cleared ground can drop to 40-60% of target density, meaning the zone will need supplementary planting the following year anyway - at additional cost, with additional mobilization, and with a year of lost growth.
Deferral costs a full year. Not just a year of waiting - a year of delayed carbon sequestration, a year of delayed first monitoring, a year of delayed crediting. For an ARR project on a 30-year timeline, losing the first year shifts every milestone.
"A week of delay on pre-activities does not cost a week. It costs a year. Because the planting window does not negotiate. It opens when the rain comes, and it closes when the rain stops. Everything before that is either done or it is not." - Hugo Asselin, Co-founder & CTO, MORFO
The financial impact
For a carbon project, delayed planting translates directly into delayed revenue.
Consider a 5,000-hectare zone projected to sequester 30 tCO2/ha over its first five years. At a voluntary market price of $15-25/tCO2, that represents $2.25M-$3.75M in potential credit value from the first crediting period alone. A one-year delay does not reduce the total - the trees will still grow - but it shifts the entire revenue curve by twelve months. For a project that has already raised capital against projected timelines, that shift has real consequences: delayed returns to investors, extended cash burn, and reduced IRR.
For compliance restoration - Reserva Legal obligations, mining rehabilitation, PRAD commitments - the financial impact is different but equally real. Delayed restoration means delayed compliance. Delayed compliance means continued exposure to fines, licensing restrictions, or reputational risk.
The planting window is not a soft deadline. It is the hardest constraint in the entire project.
Planning backward from the window
Every operational timeline in restoration should be built backward from the planting window, not forward from the project start date.
If the window opens October 29, and soil preparation requires four weeks, and vegetation control requires three weeks before that, then vegetation control must begin by August 14 at the latest. Add two weeks of buffer for weather delays and equipment issues, and the real start date is August 1. Add the time needed for diagnostic completion and prescription validation, and the chain extends back into May or June.
This backward planning is simple in concept. In practice, it requires knowing exactly how long each pre-activity takes for each zone - which depends on the diagnostic results, which depend on the field campaign, which depends on access conditions. Every link in the chain has its own uncertainty, and those uncertainties compound.
The only way to manage this is to track the critical path in real time: where is each zone in its preparation sequence, what is the velocity, what issues have emerged, and how much buffer remains before the window opens. When a delay occurs on one zone, the question is not "how do we catch up?" but "do we still have enough time, or do we need to reallocate resources from another zone?"
Seven weeks. That is all the rain gives you. Everything else is preparation.
