Leave it be. Replant where needed.

We look after land in Kampong Seila, Cambodia, and rewild it in two ways. Where forest is growing back, we leave nature be. Where cleared land needs help, we plant. About 12 hectares have been planted by hand since 2020, and fire has burned through them more than once. Next we want to pilot the Miyawaki method on about one hectare. Parts of the land were cleared decades ago. Neighbouring farmland stays as it is.

What is happening now Today

Much of the land is being left alone. Around 2020 and 2021 we saw parts of it recovering without any planting. So where nature is already doing the work, we stay out of the way. That will not be true of every cleared patch, so we also plant.

What we have planted Today

Starting in November 2020, about 12 hectares were planted by hand with a partner. Parts were planted close together, but it was not the full Miyawaki method. By January 2021 at least nine in ten of the first trees were alive. Then, in March 2021, a dry-season fire burned about a fifth of the site. Fire has gone through the planted area a few times since. The full story is in the journal.

In June 2024 we planted 54 young trees close together, as a very small forest, next to a patch that had burned that April. It is small next to what one afternoon of fire can do. Any new planting has to plan for fire first.

What we plan next Planned trial

Next we want to try the Miyawaki method properly, on about 1 hectare of cleared land: many native species, planted close together. Most Miyawaki plantings use two to five saplings per square metre. The pilot plans 20,000 saplings in three equal plots, at two, three and four per square metre, on about two thirds of a hectare. The rest of the hectare is kept for firebreaks and access. The planting pilot page has the layout, budget and what we will measure. The species, layout, fire protection and costs are still being worked out.

A dense planting is meant to thin itself. Over the first years many stems die as the trees compete for light, and that is expected. It is different from saplings lost to drought, weeds or fire in the first years, which need replacing. We will count the two separately.

Still to work out

• Which native species, and where the saplings come from
• Exactly where the pilot goes
• How to prepare the soil, and where water comes from in the dry season
• How to keep fire out, and who looks after it through the first five years
• What it all costs, including the care after planting day

What we’ll record

The next planting starts with the pilot of about one hectare, by hand, and we will write down what happens: the cost per sapling planted and per tree still alive, the hours of care, which species survive the dry seasons, how many stems the planting loses to thinning and how many to drought or fire, and how the plot compares with land left to recover on its own. We plan to publish it in the journal, including what doesn’t work. If it works, the notes may be useful to others.

After the pilot

If the pilot teaches us enough, we may plant more of the cleared areas. We have not decided. It is not a promise.

Questions