Torch cactus
Trichocereus spachianus
NEMBA: Category 1b
English: Torch Cactus, White Torch Cactus, Spach's Cactus, Golden Torch Cactus
Afrikaans: Fakkeldoring-kaktus, Orrelkaktus, Kabelkaktus
Historical scientific names: Echinopsis spachiana, Cereus spachianus
Trichocereus spachianus, commonly known as the Torch Cactus, is a striking, columnar cactus that can grow quite tall, giving it a torch-like appearance.
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Origin:
South America (specifically Argentina)
Distinguishing features:
Tall, upright, columnar stems.
Numerous golden-yellow spines.
Large, white, nocturnal flowers.
Overall appearance:
This cactus typically grows as a cluster of upright, light green, cylindrical stems that branch from the base. It has a relatively smooth surface with distinct ribs.
Height:
Up to 6 metres, though commonly seen around 2-3 metres in cultivation.
Width:
Individual stems can be up to 15 cm in diameter.
Leaves:
Cacti do not have true leaves in the conventional sense. Instead, they have modified stems for photosynthesis and spines for protection.
Flowers:
The flowers are large, showy, and trumpet-shaped, typically white, sometimes with a greenish or reddish tinge on the outer petals. They are nocturnal, opening at night and closing by morning. Trichocereus spachianus is hermaphroditic, meaning individual flowers contain both male and female reproductive organs, but it is not dioecious (having separate male and female plants).
Flowering season:
Primarily in late spring to early summer (October to December in South Africa).
Fruits:
The fruits are green to reddish, round to oval, and can be up to 5 cm in diameter. They are fleshy and typically contain numerous small seeds.
Seeds:
Small, black, and kidney-shaped.
Bark:
As a cactus, it does not have bark in the typical sense. The stem surface is smooth and green.
Thorns:
The thorns (spines) are typically golden-yellow, relatively short (around 1-2 cm long), and arranged in clusters along the ribs of the stem. Each cluster usually has 8-10 radial spines and 1 central spine, though the central spine may be absent.
Wood:
The internal structure is a woody, fibrous column, typical of larger cacti, which provides structural support.
Roots:
Fibrous and spreading, adapted for anchorage and absorbing water from a wide area, though not typically deep.
Soil type:
Prefers well-draining, sandy or gritty soil. It can tolerate poor soils but not heavy clay.
Aspect:
Thrives in full sun but can tolerate partial shade.
Edibility:
The fruits are reportedly edible, though not widely cultivated for this purpose.
Toxicity:
Generally considered non-toxic to humans and animals.
Uses:
Often grown as an ornamental plant in gardens and as a houseplant. It is also used as a grafting stock for other cacti due to its vigorous growth.
Ecology:
In its native habitat, its nocturnal flowers are pollinated by moths and bats. In South Africa, it may attract various insects for nectar, but specific interactions are not well-documented.
Distribution and habitat:
In South Africa, Trichocereus spachianus is found as an escaped alien invasive in various provinces, including the Eastern Cape, Western Cape, KwaZulu-Natal, and Gauteng. It typically invades disturbed areas, roadsides, neglected gardens, and semi-arid regions.
Derivation of name:
The genus name Trichocereus comes from the Greek "thrix" (hair) and "cereus" (wax taper), referring to the hairy flower tubes of some species.
The species name spachianus honours Édouard Spach, a 19th-century French botanist.
"Torch cactus" refers to its upright, columnar growth resembling a torch.
Historical aspects:
This cactus has been cultivated as an ornamental for many years due to its architectural form and attractive flowers.
Interesting facts:
Feeling sleepy? This cactus is a night owl! Its massive white flowers only open after dark, hoping to attract nocturnal pollinators like moths and bats for a late-night snack!
If you ever need a helping hand (or stem!), this cactus is a super grafter. It's often used as a rootstock for other, fussier cacti, giving them a strong foundation to grow on.
Don't let its spiky exterior fool you – this "torch" doesn't burn! Instead, it's quite resilient and can handle a bit of neglect, making it a great choice for budding gardeners.
Imagine a cactus that grows like a giant, green candle! That's pretty much what the Torch cactus looks like, standing tall and straight in the landscape.
Friendly alternatives:
Krantz Aloe
Aloe arborescens
Bitter Aloe
Aloe ferox
Uitenhage Aloe
Aloe africana
French Aloe
Aloe pluridens
Plant type:
Shrub, succulent or perennial
Plant family:
Cactaceae (Greek plant name) - Order: Caryophyllales