Plant Profile: Cocoa (Theobroma cacao)

Surely, everybody loves chocolate. Yet, little is known about its origin or its fascinating history. This article is a short introduction to one of my favourite plants: Cocoa – Theobroma cacao, the food of the gods.

Leaves

The mature leaves are dark green, large and glossy, very much in contrast to young leaves that are reddish and seem to droop from the end of the branches. They are pretending to be old and not worth munching on. As they mature, they turn dark green and robust.

Although deciduous, Cacao never sheds all its leaves at once. Young and mature leaves grow side-by-side on the same tree. The greyish-brown bark is rough and covered with patches of different coloured lichen and fungi.

Flowers

But what is most surprising about the Cacao tree are its flowers that sprout in clusters directly from the tree trunk and older branches.

Botanically, this is known as a ‘cauliflorous‘ flower formation. The tiny creamy-pinkish flowers are short-lived and last only for a day, and they are fertile only from sunrise and sunset. If they are not pollinated within that time, they will wither and die.

Cacao is ‘self-incompatible’, meaning it cannot pollinate itself. Nor does the wind help with the task. The pollen is too heavy and sticky for the wind to carry. The task falls to various species of tiny insects.

Fruit

From those tiny dangling flowers grow the most weird-looking pods, oblong and tapered at both ends, somewhat resembling a kind of squash.

The pods come in all colours and sizes and can be ribbed with thick skin, or smooth and thin-skinned, depending on the variety. Some pods only grow to about 4 inches long, but some types develop pods that can reach a whopping 12 inches. The immature fruits are green, turning yellow, orange, red or purple as they mature, a process that can take up to five or six months.

Each pod contains between 20 and 60 smooth, white seeds. As long as the pod stays intact, the seeds remain viable, but once opened and the pulp is removed, they dry out and lose their ability to germinate.

Cacao pods are a favourite monkey food. They may be unfamiliar with chocolate, but they are crazy about the delicious sweet and sour fruit pulp that envelopes the seeds.

Distribution

Cacao is grown in the tropics, but it is very fussy about its growing conditions. The greatest number of wild varieties are found in the lowland rainforest of northern South America, where Cacao is native. A true lowland rainforest species (never found above 100 ft above sea level), it likes to grow near water, e.g. on river banks or seasonally inundated ground.
Cacao likes it hot and steamy: its distribution range is tightly limited to about 15 degrees of latitude on either side of the equator.

Habitat and Ecology

Cacao is a tree of the tropics and very fussy about its growing conditions. Most wild varieties are found in the lowland rainforest of northern South America, where Cacao is native. A true lowland rainforest species (never found above 100 ft above sea level), it likes to grow near water, e.g. on river banks or seasonally inundated ground.

Cacao likes it hot and steamy: its distribution range is tightly limited to about 15 degrees of latitude on either side of the equator.

Cacao needs the shade of taller trees to protect young saplings and their sensitive immature leaves from direct sunlight. High humidity is a necessary prerequisite for healthy growth. But when trees are cut to create plantations, local weather patterns change. It gets drier, which negatively impacts yields and dries out the soil. Climate change also makes the trees more vulnerable to fungi and diseases.

Cacao plays an integral role in rainforest ecology. In natural conditions, it develops a taproot that helps to stabilize the river banks where it prefers to grow. The fruit pulp is a delicacy for many rainforest animals, but monkeys and birds are particularly keen on it.

The History of Cocoa

The native people of Central and South America revered the Cacao tree. They had cultivated Cacao trees for several hundred years before the Conquistadores’ invasion.

The Aztecs cultivated several species of cacao, none of which are grown commercially today. They used different species for distinct purposes: The types with the largest seeds were used as currency (money does grow on trees ;-). But it was the species with the smallest seeds, ‘Tlacacahuatl’, which was used to make a sacred beverage called Xocoatl.

Cocoa as privilege

Drinking Xocoatl was the privilege of nobles and priests, who consumed it in vast quantities. Moctezuma, the last Aztec emperor, devoured fifty golden goblets daily. This beverage was very different to what we now know and love as drinking chocolate. The Aztec version was savoury, not sweet, and there were many ways to prepare it depending on the occasion.

For general use, roasted Cacao seeds were ground and mixed with Atole (coarse, roasted corn flour) and whisked into a rich foaming brew. Chillies, Vanilla, Cinnamon and salt were added to taste.

Ceremonial use of Cocoa

The ceremonial beverage, Xocoatl, was considered as sacred as other psychotropic ritual plants, such as Ololuiqui (Turbina corymbosa) or sacred mushrooms (Psilocybe sp.). The Spanish chronicler Sahagún reports that Cacao, ‘…especially that made with the green, young fruits, has the power to intoxicate, to make one dizzy and to make one drunk…’ He warned against drinking too much of it but says, consumed in moderation, it fortifies the body and spirit.

Cocoa as an Aphrodisiac

Xocoatl was a powerful aphrodisiac and stimulating tonic. Moctezuma regularly fortified himself with it before entering the royal harem. The Mixtec, contemporaries of the Aztec, who inhabited the Oaxacan plateau, used Xocoatl in their marriage ceremonies. Chocolate has not lost its aphrodisiac appeal, even now. Chocolate probably ranks as the most popular choice for a romantic gift, next to flowers.

Neurochemical research

Neurochemical research has been able to shed some light on this ancient reputation. Scientists at the Neurosciences Institute in San Diego found three compounds in dark chocolate that closely resemble a naturally occurring neurotransmitter known as ‘Anandamide’.
Anandamide, (from Sanskrit Ananda = bliss), links to THC receptor sites in the brain. They produce a similar but less pronounced sense of well-being as Tetrahydrocannabinol, found in Cannabis. The scientists also found compounds (N-acylethanolamines) that block the breakdown of Anandamide [Piomelli, 1996].

Anandamide is the primary neurotransmitter present in the uterus during the early stages of pregnancy. It seems like its role is to convey a sense of bliss and contentment to welcome the embryonic spirit into the womb. Chocolate is also rich in Phenylethylamine, the signature compound associated with the euphoric state of being in love.

Mistaken identity and its consequences

When Cortés and his men arrived at the shores of the new world, Moctezuma mistook them for ambassadors of the feathered serpent god, Quetzalcoatl. He welcomed them with many fine gifts, including gold, jewellery and precious stones.

Appropriate to the occasion of welcoming divine guests, he also honoured them with a cup of the sacred Xocoatl brew, served in golden goblets. But the Spaniards were more interested in the gold and silver than in the cocoa brew, which they deemed ‘more suitable for hogs than men’. It took many years, but eventually, cocoa grew on them.

From Xocolatl to chocolate

Much experimentation and modification of the original recipe eventually produced something suitable for the Hispanic palate. And it soon became a hit.

Credit for it must be given to an order of Spanish nuns who lived in the province of Chiapas in southern Mexico. They learned to roast the cocoa beans, like the Aztecs, but instead of adding chilli and salt, they mixed them with cane sugar, vanilla and cinnamon.
The nuns loved their chocolate drink so much that they refused to abstain from it, even during mass.

Aware of Cacao’s aphrodisiac reputation, the Bishop was alarmed and tried to suppress the new custom. But, the nuns protested, insisting that the chocolate drink helped them overcome ‘the weakness of the stomach’ and even aided their efforts to pray. The Bishop gave in, and the nuns were granted permission to continue their unorthodox ways. And this is how the reformed Xocolatl conquered the world.

Cocoa conquers the Old World

When Cortés returned to Spain, among the many wondrous things he brought back was a sack of Cacao beans along with the recipe for the novel beverage. As in the New World, chocolate was, at first, reserved for the nobility. No ordinary mortal could afford its astronomical price. But it became an immediate hit at all the Royal Courts of Europe.

Cunningly, the Spaniards managed to keep the recipe a secret for almost a century. They had begun to plant Cacao plantations in their New World colonies soon after conquering the Aztec Empire, securing their absolute control of the cocoa trade. But ultimately, the secret of the cocoa bean got out, and their monopoly was broken. Other colonial powers established plantations far from the Theobroma’s original homeland – first in Indonesia and the Philippines, and later in West Africa and South America.

Today, Cacao is one of the most significant cash crops for small scale farmers in developing countries. It is worth about $9.5 billion in world trade. Worldwide, more than 4 million tons of Cacao beans are produced annually, more than half of which are grown in West Africa.

Hot Chocolate – a drink of the Avant-Garde

By the middle of the 17th century, ‘chocolate houses’ began to appear, rivalling ‘coffee houses’, as meeting places of the Avant-Garde. By the end of the 17th century, hot chocolate had become so popular that the government thought it worthwhile to impose a tax on it!

When the Dutch Cacao producer, Van Houten, invented a new processing method in 1828, drinking chocolate became even more popular. Unprocessed Cacao beans contain up to 53% of fat, making them hard to digest. Van Houten used a hydraulic press to squeeze out the fat content of Cocoa powder, reducing it to 10–13%. The new, lighter chocolate powder proved even more popular. Better still, the cacao butter was not wasted, but was used to improve the consistency of solid chocolate bars.

From Cocoa to Chocolate

Solid chocolates also became ever more popular. They were transformed by an innovation introduced by a Swiss chocolate manufacturer, who came up with the simple, but brilliant idea of adding condensed milk to the cocoa butter blend. This creates the familiar creamy texture of milk chocolate. Today, milk chocolate has become the most popular type of chocolate product, and the Swiss are the world leaders in this category. And, they are also world leaders in consumption, with an annual equivalent of 5.5 kg of cocoa beans per capita.

During much of the 19th century, chocolate enjoyed the status of a magical panacea. It was believed to cure just about any ailment. This notion seems a little exaggerated, but Cacao does have some interesting medicinal properties. We will explore these in next week’s post.

Further resources:

International Cocoa organization icco

International Fairtrade / Cocoa

And if you are looking for some delicious AND ethical chocolate, check out my friend Jennifer’s Sombra Buena chocolate.

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