Start from the site rather than from a species list. Soil depth, water availability through the dry months, and what already grows nearby decide what will survive. Then select for different roles and different speeds, so fast growing rows earn while slow native canopy establishes underneath their protection.
Read the site first
The commonest way a planting plan goes wrong is starting from a list of species rather than from the ground they will stand in.
Four site facts do most of the deciding.
Soil depth. How far down before rock or a hard pan. Deep rooting species cannot be planted where there is nowhere for the roots to go, whatever the rainfall.
Water through the dry months. Not annual rainfall, which averages away the part that matters, but how long the longest dry period runs and how deep the water table sits at the end of it.
Soil chemistry. Salinity and alkalinity rule species out. A soil test before planting is cheaper than a failed block.
What is already growing. The most reliable indicator available. Species surviving on uncultivated land nearby, and in older plantations in the same rainfall band, have already run the experiment.
Four roles to fill
A block is not one planting. It is several, with different jobs and different clocks. This is what multi tier planting means in practice.
Nurse species. Fast, tough, tolerant of exposure. They shade the soil, cut wind at ground level and create the sheltered conditions slower species need to establish. Some are removed later, having done their job.
Biomass rows. Fast growing, coppicing well, cut on a short cycle. This is the layer that produces material for pellets or for a digester, and the income from it funds the protection and maintenance the slow layer needs for years before it returns anything.
Long term canopy. Mostly native species. Slow, deep rooted, long lived. This is the structure that remains at the end of the lease and the layer that holds carbon durably.
Understory. Horticulture and medicinal crops suited to dry conditions, giving early income from land between the rows while the trees are small.
Filling all four with a small number of species is what makes a block robust. Filling them with one is what makes it fragile.
Spread the risk deliberately
A planting concentrated in one species carries one set of vulnerabilities. One pest, one disease, one bad season, one price collapse in the market for that product.
Spreading across species, across functional groups and across rooting depths means a shock reaches part of the block rather than all of it. The same logic that puts several income lines on one parcel applies within the planting itself.
Rooting depth is the one most often overlooked. Species that all draw from the same soil layer compete with each other in exactly the months when water is shortest.
Nursery stock decides more than people expect
Species choice sets the ceiling. Nursery quality decides how close the block gets to it.
Root form is the first thing to check. Roots that have circled inside a container stay circled after planting, and a tree that cannot anchor or reach down will look healthy for a season and struggle in the first hard summer.
Then age and hardening. A sapling raised in shade and planted straight into open sun has to adjust at the moment it is also dealing with transplant shock. Gradual exposure before planting reduces losses that would otherwise show up months later.
Then handling. Time in transit, heat in a closed vehicle, and how long stock waits before going in the ground all carry through into the survival count.
Plant for the second summer
Most of what decides a restoration block happens after the planting day photographs.
The first monsoon carries new plants through easily. The test is the dry season after it, and the one after that. Species chosen for how quickly they green up can fail that test while species chosen for root depth pass it.
This is why survival is counted on a fixed schedule over years rather than once at the end of the first season, and why the schedule is published before the planting rather than after. The same discipline is described on the measurement page.
What a site specific plan looks like
Not a list of names. A planting plan that states, for each block: the species, the role each fills, the spacing, where the stock comes from, what maintenance is committed for how many years, and what will be measured to know whether it worked.
A plan that could be used unchanged on a site in another district has not been written for this one.
See also why tree planting projects fail and how restored land earns.
Related questions
- Should restoration use only native species?
- Native species suit the local rainfall, soil and pests, they need less support once established, and they feed the insects and birds that evolved alongside them. They also grow slowly, which is a problem for a project that has to fund its own protection. Most workable plans use both: fast growing species that earn on a short cycle, and native species that provide the long term structure.
- Where should the species list come from?
- From the district rather than from a catalogue. Local forest department records, nearby older plantations and the vegetation on uncultivated land in the same area all indicate what survives here. What is native two districts away may not be native in this rainfall band or on this soil.
- How important is nursery quality?
- It is one of the largest controllable influences on survival. Root form matters most: a sapling whose roots have circled inside a container will struggle to anchor and reach water however well it is planted. Age, hardening off before planting, and how the plant is handled in transit all carry through into the second and third year.
- What about nitrogen fixing species?
- They add nitrogen to the soil through bacteria in their roots, which helps on land where organic matter has been lost. They are useful in a mix rather than as the whole planting, because a single functional group plants a single set of strengths and a single set of vulnerabilities.