Controlled wild collection

International demand is increasing every year, but supply is falling. As the "New York Times" and the renowned scientific journal "Nature" report, the trees are in very bad shape.

The survival of Somalia's frankincense trees is threatened by excessive overexploitation and crop cycles that are too short. To counteract this threat, we strictly adhere to the rules of controlled wild collection: we ensure that the trees remain untouched for at least one year after two consecutive harvest years in order to protect the sparse vegetation and ensure the survival of the tree species.

NYT, Could This be the End of Frankincense?
https://www.nytimes.com/2019/07/05/science/frankincense-trees-collapse.html

Nature, Frankincense in Peril
https://www.nature.com/articles/s41893-019-0322-2