What do Macadamia nuts look like
Hidden treasure: At first glance, the nuts almost look like limes. This is because they are covered by a green outer husk. Underneath lies the inner brown shell. Only when this has been cracked does the actual kernel reveal itself: the macadamia nut with its characteristic buttery texture.
At LIMBUA, we exclusively cultivate the Macadamia integrifolia variety.
Our contracted smallholder farmers in the Kenyan highlands remove the green husks on their farms and use them, for example, as fertilizer or compost. The inner brown shell, however, is around three millimetres thick and extremely hard. To open it carefully, LIMBUA uses its own cracking technologies.
The nuts are cracked individually at our local production facilities. The pressure and position are adjusted for each nut to reduce the risk of damaging the kernel. The remaining shells are put to further use, for example, in the production of organic compost or as an energy source in the nut-drying process.
Image 1: Organic Macadamia nuts in a green protective skin. The brown, thick shell is hidden underneath.
Image 2: The macadamia nut after cracking the brown shell in LIMBUA production.
The Macadamia Tree
How do Macadamia Nuts grow
Macadamia nuts grow on remarkable trees: these reach heights of 15 to 20 metres and develop long, thick leaves. This makes them both a source of shade and protection against evaporation. Their roots, in turn, retain water and prevent erosion – a benefit for the entire ecosystem. Macadamia trees prefer a warm, humid climate with well-drained soil.
At LIMBUA, macadamia trees grow on the smallholders’ farms exclusively in organic mixed cultivation. Among the macadamia trees, other crops such as avocado and mango trees are also grown. This is particularly beneficial for soil fertility.
It takes around 4 - 5 years until the first harvest. A mature macadamia tree yields on average 50 to 80 kg of nuts. On average, contract farmers have 20 mature macadamia trees, which for many serve as a so-called cash crop, providing an important source of income.
The flowering season of macadamia trees in Kenya falls between July and September. After pollination, small green fruits begin to develop. Over the following six to eight months, they ripen slowly, protected by a firm green husk. Only when this splits open in the following year is the right time for harvest.
Each flower raceme can bloom for 4–6 weeks, but the overall flowering season extends over several weeks, depending on the weather. After successful pollination, it takes 6–8 months for the nuts to fully mature.
Can Macadamias grow in Europe?
The macadamia tree thrives in a tropical climate with stable temperatures between 15°C and 25°C. Across most parts of Europe, permanent outdoor cultivation is not possible because the tree is highly sensitive to frost. For those who still want to experiment, young trees can be grown in containers and moved indoors during winter – similar to how citrus plants are managed.
At LIMBUA, macadamia trees grow on the slopes of Mount Kenya, where the natural conditions are well suited to their cultivation. Elevations between 1,200 and 1,800 metres, mild temperatures throughout the year and regular rainfall provide a favourable growing environment. Under suitable conditions, macadamia trees can reach up to 20 metres in height and generally begin producing nuts after around five to seven years.
Growing Macadamia at home or in a greenhouse
A macadamia tree can also be grown in Europe as a potted plant indoors or in a winter garden. What it needs most is a bright location and consistent warmth – ideally temperatures around 20°C.
Water regularly but avoid waterlogging. During the winter months, the plant enters a resting phase and needs less water. With patience, you may see the first blossoms and fruits after a few years – however, the harvest indoors usually remains more symbolic than substantial.
LIMBUA smallholder farmer with an approximately 50-year-old macadamia tree in Kenya
From seedling to Macadamia Tree:
1 Macadamia soaking
Macadamia nuts in shell (seeds) are soaked in water to soften the shell and break dormancy. Immediately after soaking, they are exposed to the sun to promote cracking. The macadamia are then placed on the bed and covered with sand.
2 Germination
After 21 days the first seeds germinate. They do not germinate uniformly, because the dormancy of each seed is different, so it takes up to 75 days to complete the germination process. Within this period, the already germinated seedlings are transplanted once a week.
3 Growth phase
After germination, the macadamia tree seedlings remain in the bed until they are about 10-15 cm tall. Around this time, the tender seedlings have a well-developed root and leaf system. The seedling is carefully pulled out of the sand to take the core, which continues to provide it with nutrients.
4 Planting
The seedlings are planted by drilling a small hole in the center of each tube and carefully inserting the tender seedling together with its core and immediately watered to cool the soil. They remain in the nursery for about 5-7 months before grafting.
5 Grafting
After transplanting, the rootstock needs 5-7 months until it is ready for grafting. When grafting the Macdamia tree, 2 plants are joined together until they are fused - in principle, it is a transplantation of one part of the plant to another. In this way we have developed particularly high-yielding macadamia trees.
6 Traceability
At our nursery, we have implemented a traceability system that helps us track each seedling closely from germination to delivery to our smallholder farmers. This helps us determine various factors that affect the seedlings at each stage of growth.
7 Pre-hardening
After the seedlings are successfully germinated after grafting, they are placed in the pre-hardening - this stage lasts 2 months. Growth and reaction to grafting are carefully monitored at this stage.
8 Delivery
After the grafted seedlings are fully hardened, they are distributed to the smallholders. It takes 4 to 5 years for an organic macadamia tree to bear fruit. As the tree matures, production increases until it reaches its optimum at around 10 years.
9 Mature trees
The macadamia tree can grow up to 20 metres high and 8 metres wide. For smallholder farmers in LIMBUA’s growing region in Kenya, macadamia is an important income generating crop.
Origin of the Macadamia nut
The macadamia nut originally comes from Australia, particularly from the areas around Queensland and New South Wales. In the 1850s, the plant was scientifically described for the first time and named after the Scottish chemist John Macadam. Since then, the macadamia has spread worldwide, with countries such as South Africa, the United States and Brazil also having large growing areas today.
Kenya offers favourable growing conditions for macadamia nuts, including fertile soils, a mild climate and sufficient rainfall. LIMBUA’s growing areas are located in the central highlands at the foot of Mount Kenya, where the local conditions are well suited to the cultivation of macadamia trees.
The Macadamia integrifolia variety differs from Macadamia tetraphylla in several ways. It generally has a higher oil content and contains less sugar. Integrifolia can also produce higher yields, making it well suited to organic cultivation and offering smallholder farmers in Kenya an additional source of income.
Another difference becomes visible during roasting: Due to their higher sugar content, Tetraphylla nuts tend to become darker when roasted. This can result in a less uniform appearance. For this reason, many customers and packers prefer Integrifolia for their products.
Macadamia integrifolia originates from the subtropical rainforests of Australia and is one of the macadamia species cultivated commercially around the world. Its cultivated varieties are well suited to the conditions found in the Kenyan highlands.
The varieties also differ in taste and texture: Macadamia integrifolia typically has a mild, buttery flavour and a fine texture, while Tetraphylla tends to have a more robust flavour and a slightly drier, firmer bite.
The two varieties can also be distinguished by their appearance. Tetraphylla generally has a rougher and thicker shell, which can make processing more challenging. Integrifolia, by comparison, has a thinner and smoother shell. The characteristic tiger-like pattern on its smooth brown shell can provide another indication that the nut belongs to the Integrifolia variety.
Top: Macadamia integrifolia with a smooth shell – the variety processed by LIMBUA.
Bottom: For comparison, the rougher Tetraphylla.
How our macadamia nuts are grown
LIMBUA works exclusively with Kenyan smallholder farmers at the foot of Mount Kenya. The fertile soils and local climatic conditions provide suitable conditions for agricultural production. Careful cultivation and the farmers’ knowledge of their land also contribute to the development of the crops. Farming follows organic farming methods.
Many farmers converted to organic farming through their cooperation with LIMBUA, as awareness of the risks associated with chemical pesticides had previously been limited. In addition to organic cultivation, mixed farming plays an important role. Avocado trees and various other crops grow alongside the macadamia trees. This combination of different crops helps maintain soil fertility and provides farmers with food crops as well as products that can be sold. In this way, the mixed farms contribute to both the farmers’ livelihoods and the agricultural diversity of the growing region.
The income generated from agriculture supports the financial situation of the smallholder farmers and their families. To support the development of their farms, LIMBUA has worked with agronomic experts to develop productive macadamia tree seedlings. The seedlings are raised in our nursery in Kenya and subsequently distributed to the farmers for planting on their mixed farms. Since 2016, more than 480,000 macadamia, avocado and mango seedlings have been raised in the nursery. (As of 2026)
We also provide our partners with regular training. Local agronomists share practical knowledge about cultivation, harvesting and processing. The training helps farmers improve their farming practices and supports the quality of the crops and the volumes harvested.
How healthy is the macadamia nut?
The macadamia nut has an interesting nutritional profile. It contains a high proportion of unsaturated fatty acids, as well as dietary fibre and comparatively few carbohydrates. It also contains various vitamins, minerals and trace elements, including magnesium, calcium, iron, zinc, potassium, phosphorus, selenium and B vitamins.
Unlike many carbohydrate-rich snacks, the macadamia nut consists mainly of fat, with unsaturated fatty acids accounting for the largest proportion. Carbohydrates, by comparison, make up only a relatively small part of its nutritional profile. According to comparative data from the World Macadamia Organisation, a serving of 28 to 30 grams contains approximately four grams of carbohydrates, including around 2.4 grams of dietary fibre. This may make macadamias interesting for people who consciously consider the carbohydrate content when planning their meals. At the same time, their high fat content also makes them energy-dense.
Conclusion: Macadamias combine their characteristic buttery flavour with a distinctive nutritional profile. They consist mainly of unsaturated fatty acids and also contain dietary fibre and comparatively few carbohydrates.
Healthy fats – it’s all about the balance
Macadamia nuts contain a particularly high proportion of monounsaturated fatty acids (MUFAs), which account for most of their total fat content. These primarily include omega-9 and omega-7, a fatty acid that is less commonly found in foods. Compared with many other types of nuts, macadamias have a particularly high content of monounsaturated fatty acids.
Macadamias also contain smaller amounts of polyunsaturated fatty acids (PUFAs), including omega-3 and omega-6. These fatty acids are essential because the human body cannot produce them itself. They must therefore be obtained through food as part of the diet.
According to the World Macadamia Organisation, the ratio of omega-6 to omega-3 in macadamias is approximately 6:1. This distinguishes their fatty acid profile from that of many other types of nuts. Overall, macadamia fat is characterised by a high proportion of monounsaturated fatty acids and smaller amounts of polyunsaturated fatty acids.
What do macadamia nuts taste like?
A fat content of around 75 per cent gives macadamia nuts their delicate, almost creamy texture. Their flavour is mild and slightly sweet, making them suitable for both sweet and savoury dishes.
Macadamia nuts can be enjoyed raw as well as roasted and salted. They are also suitable for confectionery, baked goods and desserts, as well as salads, bowls and other savoury dishes.
Macadamia oil is obtained by pressing the nuts. Depending on the product specification, it is suitable for both cold and hot culinary uses. It is also used as a plant-based ingredient in cosmetic formulations for skin and hair care.
"My greatest motivation is that our smallholders, stakeholders and customers who visit our nursery appreciate the products and services I offer them."
