Argan oil is the main source of revenue in this part of southern Morocco, where few other crops survive the low rainfall and searing summer heat.
It is also widely used in Moroccan cuisine and has been certified with an Appellation of Origin since 2010.
Argan is so important to the region between the towns of Essaouira and Agadir that in 1998 UNESCO declared a biosphere reserve in the area and later added the tree's cultivation to its Intangible Cultural Heritage list.
It is a time-honored and labor-intensive craft, but one increasingly shunned by young people in the North African kingdom.
Women, mostly aged over 60, manually pulp the small yellow fruits at Cooperative Marjana, while others use hammers to crush the robust shells and remove the nuts.
The fruits are then sorted, roasted, ground and pressed for their oil, which is used in cooking but has also long been famed for its moisturizing and anti-ageing properties for skin and hair.
"It's difficult work and it requires experience and, most of all, patience," said Samira Chari, who at 42 is Marjana's youngest artisanal worker.
Cooperative founder Amel El Hantatti says the job's physical nature is one reason "young people aren't taking up this craft anymore", despite a lack of local employment.
The cooperative's younger workers prefer to work in the gift shop, selling argan soap, shampoo and moisturiser.
One of them, Assia Chaker, 25, said: "I tried to work a few days with the craftswomen but I couldn't carry on, it's a hard process and really tiring.
"I like having contact with people and practizing other languages with tourists who come into the shop every day, instead of spending the whole day crushing and pulping argan nuts.
"Anyway, one day the job will be done by machines," she added.
Hantatti said the process is hard to mechanize, insisting that "oil extracted by machines will never have the same flavor as what the women produce.
"It contains all the positive vibes of these artisans, their laughter, the stories they share as they're working. There's a spiritual quality that makes it special and unique."
The cooperative produces up to 1,000 liters of oil a year and works with tour companies bringing groups of visitors as they pass through the popular coastal region.
Morocco produces around 5,640 tons of argan oil annually, according to official figures, around 40 percent of it for export.
producers in Essaouira say the next generation has little interest in learning their craft.
"All I've known all my life is argan oil," said Samira as she roasted nuts in a large clay oven. "For me, it's as essential as oxygen and water."
The divorcee did not have the opportunity of an education and works 10 hours a day to provide for her children.
Samira learned every stage of argan oil production from her parents, skills traditionally passed from generation to generation.
But she says her children have no desire to go into the industry -- a choice she understands.
Yet, with a growing body of scientific research backing up its health claims, argan oil remains an important part of the local economy and a sought-after commodity worldwide.
Morocco's government has also been paying more attention to the sector, notably by building 13 reservoirs to collect scant rainfall and help mitigate the region's ever-worsening droughts.
Rabat aims to double argan oil production by 2030, hoping to support the emergence of a "new generation of the rural middle class".
But with fewer and fewer young people taking up the craft, time will tell whether another generation will learn the traditions associated with the tree.
The area's otherwise arid landscape is home to vast argan orchards. Tourists stopping to see the production process and buy argan products are warmly welcomed by Marjana's all-female staff.