Spekboom Benefits: The SA Carbon-Sucking Wonder Plant

If you’ve ever driven through the Eastern Cape and seen vast, shimmering green thickets that look almost too tidy to be wild, you’ve likely met the spekboom. This humble, hardy succulent is having a well-deserved moment in the spotlight, and for good reason. Known scientifically as Portulacaria afra, spekboom is not just another pretty garden plant – it’s a bona fide environmental superhero that happens to be ridiculously easy to grow.

What is Spekboom, Exactly?

Spekboom is a small-leaved succulent that can grow as a low, sprawling shrub or, if left to its own devices, a small tree reaching up to 5 metres tall. It’s indigenous to South Africa’s semi-arid regions, particularly the succulent Karoo and the thicket biomes of the Eastern Cape. In English, it’s sometimes called Elephant Bush or Pork Bush (a literal translation of the Afrikaans “spekboom”, referring to its fleshy, pork-like leaves). It’s also a favourite for spekboom bonsai enthusiasts, thanks to its gnarled trunk and forgiving nature.

The Big Claim: Carbon Capture Champion

Here’s the fact that has scientists and eco-warriors buzzing: spekboom is one of the most efficient carbon-sequestering plants on Earth. It can absorb between 4 and 10 tonnes of carbon dioxide per hectare per year (Africa Check verified 2.9–8.6 tonnes/ha/yr; the BBC recorded a maximum of 15.4 tonnes in exceptional thicket conditions). That’s more than most rainforests. This is because spekboom uses a special type of photosynthesis called CAM (Crassulacean Acid Metabolism). It opens its stomata at night to absorb CO2, which means it loses very little water in the process. In simple terms, it’s a carbon-sucking machine that works while it sleeps.

What’s even better is that it keeps absorbing carbon for as long as it lives – which can be 100 years or more. So planting a spekboom today is a gift to your grandchildren.

Waterwise and Wonderfully Low Maintenance

If you’re tired of plants that need constant pampering, spekboom is your answer. It’s a succulent, so it stores water in its thick, fleshy leaves and stems. It thrives in well-drained soil and full sun, but it’s also happy in semi-shade. Once established, it needs very little water – a deep soak once every two to three weeks in summer and almost nothing in winter. It’s frost-sensitive though, so if you live in a very cold area, give it a sheltered spot or grow it in a pot that you can move.

It’s also remarkably pest-resistant. You’ll rarely see aphids or mealybugs bothering it. It’s the perfect plant for the forgetful gardener, the busy professional, or anyone who wants a lush green garden without the guilt of high water bills.

How to Grow and Propagate Spekboom

This is where spekboom really shines – it is one of the easiest plants to propagate. You don’t need seeds, hormones, or fancy equipment. Simply take a cutting (about 15-20cm long), let the cut end dry out for a day or two to form a callus, and then stick it straight into the ground or a pot filled with sandy, well-draining soil. Water lightly and place in a sunny spot. Within a few weeks, roots will form. It’s that simple.

For best results, plant in a spot that gets at least six hours of sun. If you’re planting a hedge, space cuttings about 30cm apart. They’ll knit together into a dense, green screen within a year or two.

Practical Uses: From Hedge to Elephant Snack

Spekboom is incredibly versatile. Here are just a few ways to use it in your garden:

Hedges and Screens: It makes a dense, evergreen hedge that can be clipped into formal shapes or left natural and bushy.
Bonsai: Because of its small leaves and thick, woody stem, it’s a fantastic beginner bonsai. It responds well to pruning and can live happily in a shallow pot for decades.
Firebreaks: In rural areas, spekboom is often planted as a firebreak because it has a high moisture content and doesn’t burn easily.
Wildlife Food: In the wild, elephants, rhinos, and kudu love munching on it. In your garden, you’ll find that tortoises and some birds enjoy the nectar-rich flowers. The leaves are also edible for humans – they have a tangy, lemony flavour and are great in salads or smoothies.
Erosion Control: Its dense root system helps bind the soil, making it excellent for slopes or areas prone to erosion.

Why Every South African Garden Should Have One

We live in a water-scarce country, and our gardens need to reflect that. Spekboom is the perfect symbol of a resilient, waterwise South African garden. It’s not just about saving water though – it’s about actively doing good. Every spekboom you plant is a tiny carbon sink working for you. It’s a plant that gives back, that asks for almost nothing, and that looks beautiful doing it.

Whether you plant it as a hedge, a feature shrub, a bonsai, or simply a potted friend on your stoep, spekboom is a plant with purpose. It’s a conversation starter, a teaching tool for kids, and a genuine ally in the fight against climate change. Pop into your local nursery or browse the Aloe Roots plant collection to get your hands on one. Your garden – and the planet – will thank you.