Spekboom

Edibility: 

Edible. The leaves are commonly eaten raw, particularly in salads, stews, or as a thirst quencher. They have a tangy, slightly sour taste, especially when fresh in the morning. They are rich in Vitamin C and have a high nutritional value.

Toxicity: 

Non-toxic to humans and animals. It is a safe and highly nutritious food source, especially for livestock and wild animals like elephants (hence 'Elephant Bush').

Uses:

• Environmental Restoration: A cornerstone species for landscape restoration, particularly in the degraded Albany Thicket biome of the Eastern Cape. It is highly effective at re-vegetating arid areas.

• Carbon Sequestration: Renowned for its exceptional ability to absorb and store large amounts of atmospheric carbon dioxide (CO2), making it a valuable plant in the fight against climate change. It utilizes Crassulacean Acid Metabolism (CAM) photosynthesis, allowing it to efficiently fix carbon, especially at night, and minimise water loss.

• Ornamental Plant: Widely used in gardens as a hedge, a specimen shrub or small tree, in rockeries, succulent gardens, and as a groundcover (prostrate forms). It is an excellent choice for bonsai.

• Edible Plant: Leaves are consumed raw by humans and are a vital food source for livestock and wildlife.

• Hedge Plant: Can be pruned into a dense, attractive, and long-lived hedge.

• Container Plant: Ideal for pots and containers due to its manageable size and drought tolerance.

• Medicinal (Traditional): Used traditionally for various ailments, including sore throats, mouth infections, and skin conditions (e.g., insect bites, rashes, sunburn).

Ecology:

• Keystone Species: A dominant and ecologically critical species in the Albany Thicket biome, providing food and habitat for numerous animals and playing a vital role in ecosystem functioning.

• Food Source: A primary food source for browsers like elephants, kudu, and goats, as well as tortoises. Its resilience to grazing allows it to recover quickly.

• Drought Adaptation: Its succulent leaves and CAM photosynthesis allow it to store water and survive extended periods of drought, contributing to its ecological dominance in arid regions.

Distribution and habitat: 

Portulacaria afra is widely distributed in the eastern parts of South Africa.

• South African Provinces: Eastern Cape (where it is most abundant, especially in the thicket biome), KwaZulu-Natal, Mpumalanga, Limpopo, and also found in the Little Karoo in the Western Cape.

• Habitat: Dominant in the semi-arid succulent thickets, particularly the Albany Thicket, often found on dry, rocky slopes, valleys, and riverbanks. It can also occur in dry bushveld.

Derivation of name:

• The genus name Portulacaria suggests a resemblance to the genus Portulaca (purslane), another group of succulent plants.

• The species epithet afra is Latin for "from Africa," indicating its origin.

• The common Afrikaans name "Spekboom" translates to "bacon tree" or "fat tree," referring to the succulent, fleshy nature of its leaves and stems, which store water and energy. "Olifantskos" means "elephant food."

Historical aspects: 

Portulacaria afra has been an integral part of the South African landscape and ecosystem for millennia, evolving alongside mega-herbivores like elephants. Its traditional uses as food and medicine by indigenous communities are well-established. In recent decades, its extraordinary carbon sequestration capabilities have brought it global recognition as a "miracle plant" for ecological restoration and climate change mitigation efforts, leading to large-scale planting initiatives.

Interesting facts

• This "Spekboom" is a climate change superhero! It's incredibly efficient at sucking up carbon dioxide from the air, even more so than some rainforests, making it a tiny but mighty air purifier.

• You can eat its leaves! They have a tart, lemony taste and are great in salads or just for quenching your thirst on a hot day – no wonder it's also called "Elephant's Food," as they love to munch on it too!

• It's so tough and resilient that even if a branch breaks off, it can often just grow into a whole new plant if it lands on the ground, making it incredibly easy to propagate.

Growing tips

• Propagation: Extremely easy to propagate from cuttings. Simply break off a stem or branch, allow it to dry for a few days (to form a callus), and then plant it directly into well-drained soil. It roots readily.

• Planting: Plant in full sun for best results, though it tolerates light shade. Requires well-drained soil; very susceptible to root rot in waterlogged conditions.

• Watering: Highly drought-tolerant once established. Water sparingly, allowing the soil to dry out completely between waterings. More frequent watering may be needed for young plants or during extreme heat, but avoid overwatering.

• Feeding: Rarely needs fertilising. If grown in a pot for an extended period, a diluted, balanced liquid fertiliser in spring can be beneficial.

• Pruning: Responds very well to pruning, making it ideal for hedges, shaping, and bonsai. Regular pruning encourages denser growth.

• Frost: Moderately frost-hardy, but protect from severe, prolonged frost, especially when young. It can recover from frost damage if the roots survive.

• Pests/Diseases: Generally pest and disease-free. Occasional issues with mealybugs or scale, but usually not severe.