David Attenborough – Kingdom of Plants 

The story of terrestrial life began not with animals, but with the quiet conquest of the land by plants. In this 4K restoration of the landmark series, Sir David Attenborough takes us to the Royal Botanic Gardens, Kew. Here, we can observe the David Attenborough natural history legacy through the lens of modern Ultra HD technology. This first instalment, “Life in the Wet Zone,” explores the damp, warm environments where the first plant pioneers established themselves nearly 450 million years ago.

The Living Laboratory: Kew’s Palm House

Our journey begins in the iconic Palm House. This Victorian engineering marvel was constructed in 1844 using techniques borrowed from the shipbuilding industry. It houses a vast array of tropical plants brought back by explorers. One particularly notable resident is the Encephalartos altensteinii. This ancient cycad arrived at Kew in 1775, making it almost certainly the oldest pot plant in the world.

Within this humid sanctuary, plants grow rapidly throughout the year. However, they are not the passive organisms we often imagine. When we speed up time, we reveal their true, aggressive nature. Plants are competitive creatures, locked in a desperate battle for light and space. They pulse and stretch as they strive to barge their way into the best positions. Creepers and vines reach out to hitch a ride on their neighbours, demonstrating a level of activity usually associated with animals.

Mastering the Elements: Water and Light

In the wet zone, water is the primary resource. Some species, such as the Taro plant, have developed extraordinary self-cleaning leaves. These leaves are covered in microscopic structures that hold water droplets aloft. Consequently, the water rolls away, carrying dirt and bacteria with it. This “Lotus Effect” ensures the leaf remains dry and healthy in the sodden rainforest.

High in the canopy, other plants use water differently. The Tank Bromeliad has dispensed with soil entirely. Instead, it attaches to branches where light is plentiful. Its broad leaves channel rainwater into a central reservoir. These pools can hold up to 50 litres of liquid. Interestingly, these reservoirs provide a home for creatures like the Poison Dart Frog. The plant provides a sanctuary, while the frog provides nutrients through its droppings. It is a perfect example of the entwined relationships found in the plant kingdom.

The Evolution of the Pioneers

The David Attenborough narrative then traces the history of plant life back to its origins. The first pioneers were thread-like algae that emerged from rivers to grow on muddy margins. Over millions of years, their descendants developed watertight coverings. These became the liverworts and mosses. Later, ferns and horsetails developed stiffened stems, allowing them to stand upright and reach for the light.

This greening of the Earth allowed animals to follow plants onto land. By pumping out oxygen, plants created the very air we breathe today. However, reproduction remained a challenge. Early plants like conifers used the wind to transport pollen. This was successful but highly wasteful. About 140 million years ago, a more efficient method appeared: the flower.

Solving the Abominable Mystery

Charles Darwin was famously baffled by the sudden explosion of flowering plants in the fossil record. He called it an “abominable mystery.” Flowering plants, or angiosperms, appeared to radiate into thousands of species almost overnight. We now know this was caused by a doubling of genetic material and the development of a unique relationship with animals.

Flowers used bright petals and sweet nectar to recruit insects as messengers. This door-to-door service allowed plants to diversify into almost every habitat on Earth. At Kew, the Waterlily House showcases the giant Amazon waterlily. Its flowers can close completely, trapping insects to ensure pollination occurs. This intimate coupling between plants and their pollinators has driven the diversity we see today.

The Pinnacle of Cooperation: Orchids and Beyond

Orchids represent the height of evolutionary ingenuity. The Bee Orchid mimics the scent and appearance of a female bee to trick males into transporting its pollen. Meanwhile, the Comet Orchid of Madagascar carries its nectar in spurs nearly a third of a metre long. Darwin predicted that a moth with an equally long tongue must exist to pollinate it. Decades later, Morgan’s Sphinx Moth was discovered, proving his theory correct.

Furthermore, we see the complex “one-upmanship” between the Passion Vine and butterflies. The vine produces toxins in its leaves to deter caterpillars. However, some caterpillars tolerate these toxins and use them for their own defence. In response, some vines have evolved leaves with yellow spots that look like butterfly eggs. This trick suggests the leaf is already “taken,” persuading the butterfly to lay her eggs elsewhere.

Conservation and the Smallest Lily

The episode concludes with a powerful look at the Nymphaea thermarum. This is the smallest and rarest waterlily in the world. It was declared extinct in the wild after its native Rwandan hot spring was diverted. Fortunately, a single specimen was brought to Kew.

Carlos Magdalena, known as the “Plant Messiah,” spent years trying to save the species. He eventually discovered that unlike other lilies, this one prefers to grow in damp mud rather than deep water. By replicating this unique habitat, he successfully rescued the species from oblivion. This story serves as a reminder that the loss of even one inconspicuous plant can have unpredictable consequences for the entire ecosystem.