Great Karoo Plant Field Guide

Region at a Glance

The Great Karoo is a semi-arid interior region of South Africa characterized by drought-adapted trees, edible succulents, livestock-toxic plants, and documented Karoo traditional-use species. This environment encompasses the Nama-Karoo and adjacent semi-arid shrublands, rocky koppies, dry watercourses, farm-disturbed zones, and succulent thicket transitions, as featured in Alone Season 12.

Plant distribution across this landscape strictly follows available water, soil depth, rock type, and grazing history. Woody trees cluster along drainage lines and farm water points, while low shrubs, grasses, and succulents dominate the open ground. Many species survive chronic drought by storing water or producing potent defensive chemicals, and several of the region's most dangerous plants are well documented due to their history of poisoning livestock.

Field Priorities

• Do not equate succulent with safe; several Karoo succulents cause serious poisoning.
• Use thorns, leaf arrangement, bark, and pods together to reliably identify thorn trees.
• Avoid harvesting protected or slow-growing succulents, bulbs, and medicinal roots.
• Treat all milky sap, tobacco-like leaves, and iris-like bulbs as hazardous until positively identified.
• Water stress concentrates salts, oxalates, and plant toxins; published edibility does not guarantee safe emergency use.

Non-Negotiable Plant Safety

In the event of suspected poisoning, immediately remove all plant material from the mouth and preserve a physical sample or clear photograph for identification. Contact emergency medical services or a poison control center immediately. Do not induce vomiting unless specifically directed by medical personnel.

Positive Identification Protocol

Always follow a disciplined, repeatable diagnostic process in the field. Botanical confidence is built step-by-step through independent physical features, never through intuition or guesswork.

Step 1: Place and Habitat

Observe the broader environment. Record the specific habitat type, moisture availability, slope, elevation, and the neighboring dominant plant communities.

Step 2: Growth Form

Determine the fundamental growth habit of the specimen: tree, shrub, vine, herb, grass-like plant, fern, or succulent.

Step 3: Leaf Morphology

Examine the foliage closely. Check leaf arrangement along the stem, overall shape, margin edges, venation patterns, presence of hairs, crushed odor, and the appearance of the leaf underside.

Step 4: Stem and Bark

Inspect the supporting structures. Look for thorns, spine configurations, sap color and consistency, pith structure, lenticels, buds, twig coloration, and outer bark texture.

Step 5: Flowers and Fruit

Analyze reproductive structures. Count petals, observe flower clusters and inflorescence patterns, inspect seed pods or seed capsules, and note how fruits are attached.

Species Identification: Saltbush (Atriplex spp.)

This gray-green shrub is characterized by broad triangular to oval mealy leaves, inconspicuous flowers, and strong salt-tolerant growth.

• Habitat: Farm plantings, saline flats, and disturbed dry ground; introduced in South Africa.
• Season: Leaves are present year-round.
• Documented Use: Leaves are documented forage and have limited food use following correct identification and preparation.
• Look-Alikes: Native Atriplex and other gray shrubs require examination of flowers and fruits for confident species identification.

Documented Edible Plants: Karoo Crossberry

Harvest documented foods only. Positive identification and safe preparation remain essential before handling or consuming any wild plant.

Karoo Crossberry (Grewia robusta) is documented as an edible species within southern Africa.

Species Identification: Karoo Crossberry (Grewia robusta)

Karoo Crossberry is a shrub characterized by rough toothed leaves, star-like pink to mauve flowers, and small lobed reddish-brown fruits.

• Habitat: Rocky slopes, dry thicket, and Karoo scrub.
• Season: Fruits ripen during summer to autumn after seasonal rain.
• Documented Use: Ripe fruits are documented as edible in southern African ethnobotanical records.
• Look-Alikes: Other Grewia species differ in leaf hairiness and fruit lobing.

Bluebush (Diospyros lycioides) is another documented edible plant found in similar Karoo scrub environments.

Species Identification: Bluebush (Diospyros lycioides)

Bluebush is a many-stemmed shrub or small tree with narrow blue-green leaves, small cream-colored bell-shaped flowers, and rounded reddish to dark fruits.

• Habitat: Dry watercourses, rocky scrub, and open woodland across the broader Karoo.
• Season: Fruit ripens from late summer to autumn.
• Documented Use: Fully ripe fruit is documented as food in parts of southern Africa, and the hard wood is used for crafting small implements.
• Look-Alikes: Lycium shrubs often feature thorns and tubular purple flowers; bluebush lacks paired acacia thorns.

Toxic Plants to Avoid: Yellow Tulp

High-consequence toxic species must be recognized and avoided before any wild gathering begins.

Documented Edible Plants: Sour Fig

Sour Fig (Carpobrotus edulis) is a documented edible succulent native to southern Africa.

Identification: Sour Fig

Sour Fig is a ground-hugging succulent with large leaves that are triangular in cross-section, bright yellow to pink daisy-like flowers, and fleshy fig-like fruits.

• Habitat: Sandy or rocky disturbed ground, roadsides, and some Karoo settlements, becoming more common toward coastal and southern margins.
• Season: Fruits ripen from summer to autumn.
• Documented Use: Ripe fruits and leaf preparations have documented food and traditional uses.
• Look-Alikes: Mesembryanthemum species are smaller and may exhibit bladder-like leaf cells.

Prickly Pear (Opuntia ficus-indica) is another documented edible plant encountered across arid and semi-arid terrain.

Identification: Prickly Pear

Prickly Pear forms large flattened pads covered with clusters of fine glochids and occasional spines, bearing showy flowers followed by oval red, orange, or yellow fruits.

• Habitat: Farm edges, roadsides, abandoned homesteads, and dry slopes; categorized as invasive across parts of South Africa.
• Season: Fruit ripens summer through autumn; pads are present year-round.
• Documented Use: Ripe fruit and properly prepared young pads are documented food sources. The juicy fruits also provide valuable moisture.
• Look-Alikes: Other Opuntia species occur in the region, varying in spine density and fruit quality.

Documented Edible Plants: Common Purslane

Common Purslane (Portulaca oleracea) is a widely distributed and documented edible succulent herb.

Identification: Common Purslane and Old Man Saltbush

Common Purslane is a low, spreading herb with smooth reddish stems, small opposite or clustered succulent leaves, and tiny yellow flowers.

• Habitat: Disturbed soil, gardens, livestock enclosures, and seasonally moist flats.
• Season: Active during the warm season, especially following rains.
• Documented Use: Young leaves and stems are widely documented as edible, typically cooked or eaten raw in modest quantities.
• Look-Alikes: Various spurge species are low and succulent, but exude a toxic milky sap when broken; purslane sap is entirely clear.

Old Man Saltbush (Atriplex nummularia) is another documented edible shrub occurring in arid pastoral areas.

Bitter Aloe (Aloe ferox)

Bitter aloe forms a large single rosette of thick, spiny-edged leaves set atop a trunk, producing tall branched spikes of vibrant red-orange flowers.

• Habitat: Rocky slopes and dry hills, particularly along southern and eastern Karoo margins.
• Season: Flowers during winter.
• Documented Use: A well-documented South African medicinal and commercial species. The inner leaf gel and bitter yellow latex have distinctly different properties.
• Look-alikes: Other aloe species differ in leaf arrangement, surface spotting, and flower branching patterns.

Cancer Bush (Lessertia frutescens)

Cancer bush is a soft gray-green shrub bearing compound leaves, bright red-orange pea-like flowers, and distinctive inflated papery seed pods.

• Habitat: Dry Karoo scrub, roadsides, and disturbed veld.
• Season: Flowers predominantly from spring through summer.
• Documented Use: Widely documented across Khoi, San, and broader South African herbal traditions, and commonly sold commercially.
• Look-alikes: Other pea-family shrubs share similar red flowers; inflated papery pods and silky gray foliage are key diagnostic traits.

Traditional-Use Plants

This section details documented regional plants with recorded cultural and historical applications across Southern Africa.

Kattekruie (Ballota africana)

Kattekruie is an aromatic, gray woolly shrub with opposite scalloped leaves and small pink-purple flowers arranged in dense rings around the stems.

• Habitat: Rocky slopes, disturbed ground, and dry shrubland.
• Season: Active flowering spans spring through autumn.
• Documented Use: South African traditional applications include remedies for coughs, colds, and various topical external preparations.
• Look-alikes: While several mint-family shrubs have square stems and opposite leaves, kattekruie is separated by its distinctive flower rings and woolly leaf texture.

Wild Rosemary (Eriocephalus africanus)

Wild rosemary is a rounded aromatic shrub characterized by narrow gray leaves, small white daisy-like flower heads, and fluffy, cottony seed heads.

• Habitat: Dry rocky slopes and open Karoo shrubland.
• Season: Flowers from winter to spring.
• Documented Use: Published traditional uses include culinary seasoning, insect-repellent bedding, washes, and traditional cold remedies.
• Look-alikes: Several related Eriocephalus species occur in the region; distinguishing them requires close examination of flower heads and leaf pubescence.

Suspected Poisoning Protocol and Harvest Ethics

Protocol for suspected plant poisoning:

• Stop exposure immediately.
• Remove any remaining plant material from the mouth and rinse with water.
• Do not induce vomiting.
• Save a plant sample or photo for medical and botanical identification.
• Call emergency medical services or poison control without delay.
• Continuously monitor the patient's breathing and state of consciousness.

Field harvest ethics and sustainable foraging guidelines:

• Take the common and leave the rare; harvest only abundant populations.
• Never girdle a tree when gathering bark or branch material.
• Avoid harvesting roots and entire plants to allow populations to regenerate.
• Leave ample food and forage for local wildlife.
• Follow all Indigenous land agreements and protected-area regulations.
• Restore disturbed ground, replacing leaf litter and topsoil before leaving the site.

Sources, Scope, and Limitations

Key botanical, toxicological, and ethnobotanical references utilized in this guide:

• PlantZAfrica (South African National Biodiversity Institute) – Regional species profiles: https://pza.sanbi.org/
• Red List of South African Plants (South African National Biodiversity Institute) – Distribution and conservation assessments: http://redlist.sanbi.org/
• Plants of the World Online (Royal Botanic Gardens, Kew) – Global taxonomy and distribution: https://powo.science.kew.org/
• People's Plants: A Guide to Useful Plants of Southern Africa (Ben-Erik van Wyk and Nigel Gericke; Briza Publications) – Ethnobotanical documentation
• Plant Poisonings and Mycotoxicoses of Livestock in Southern Africa (Kellerman, Coetzer, Naude, and Botha; agricultural toxicology literature) – Veterinary and plant toxicology: https://www.arc.agric.za/
• South African Invasive Species Resources (Department of Forestry, Fisheries and the Environment) – Invasive species management: https://www.dffe.gov.za/
• Agricultural Research Council Plant and Forage Resources (Agricultural Research Council, South Africa) – Agricultural botany and rangeland forage: https://www.arc.agric.za/

Independent Publication Notice

This guide is an independent educational reference and is not affiliated with HISTORY, the Alone television series, local Indigenous governments, or protected-area authorities.

Traditional-use notes summarize published historical and botanical literature and do not transfer cultural authority. Local knowledge holders, current conservation regulations, and qualified medical or botanical professionals must always take precedence.

Seasonal and Habitat Planning

Availability is local and variable. Use seasonal patterns to plan field observation rather than assuming harvest potential.

Field planning by seasonal phase:

• Spring / Early Rains: New shoots, flowers, catkins, and wetland hazards become visible. Learn leaves and flowers before fruit, and avoid roots and bulbs.
• Summer / Peak Growth: Maximum foliage is present; most edible greens and traditional-use herbs are identifiable. Photograph multiple traits and record habitat and abundance.
• Autumn / Fruit: Most berries, hips, cones, and seed structures mature. Confirm identification using the entire plant, and leave adequate food for wildlife and regeneration.
• Winter / Dormant: Evergreen shrubs, bark, twigs, cones, and persistent fruit remain. Rely on woody traits, as snow and frost obscure herb identification.

Habitat forecast and primary risks:

• Dry ridge / exposed slope: Likely plants include sweet thorn, karee, and wild olive. Primary risks include windthrow, fire, and damaging protected, slow-growing plants.
• Moist forest / sheltered valley: Likely plants include buffalo thorn, shepherd's tree, and spekboom. Primary risks include look-alikes, falling timber, and poor visibility.
• Wetland / peat / stream edge: Likely plants include yellow tulp and krimpsiekte plant. Primary risks include water hemlock or toxic bog shrubs, alongside unstable ground.
• Open disturbance / camp edge: Likely plants include sour fig, prickly pear, common purslane, and old man saltbush. Primary risks include contamination, invasive species, and human chemicals.

Seasonal Reality

A late frost, drought, fire, flood, browsing pressure, or poor flowering year can remove an expected food source entirely. Build survival and foraging plans around several independent resources, and assume that every single crop may fail.

Look-alike and Hazard Matrix

The most critical plant knowledge is knowing what not to touch, taste, or dig.

• Yellow tulp: Iris-like plant with narrow sword leaves, underground corms, and yellow to cream three-part flowers with patterned inner segments. Highly poisonous to livestock and humans; cooking does not neutralize corm toxins. Ingestion can cause severe digestive and cardiovascular effects.
• Krimpsiekte plant: Succulent shrub with thick knobbly stems, peeling bark, seasonal fleshy leaves, and tall flower stalks. Contains cumulative bufadienolide toxins that cause krimpsiekte in livestock and serious cardiac impairment in humans. Dried plant material remains dangerous.
• Pig's ear / plakkie: Succulent shrub with opposite, thick, rounded gray-green leaves often edged in red, bearing drooping clusters of orange-red tubular flowers. Contains bufadienolides that poison livestock and humans. Never ingest or apply as improvised medicine.
• Tree tobacco: Tall shrub or small tree with smooth, powdery blue-green leaves and tubular yellow flower clusters. All parts contain toxic anabasine-type alkaloids. The leaves have caused fatal poisonings when mistaken for edible wild greens.

Cross-Check Protocol

Always match at least three reliable sources and positively rule out every dangerous look-alike before making an identification.

Field Documentation Kit Guidelines:

• Photograph the whole plant, upper and lower leaf surfaces, stem, bark, flowers, fruit, and surrounding habitat.
• Include a scale object in all diagnostic photographs.
• Record the date, location, and your level of confidence.
• Never let an AI label overrule a regional botanist.

Trees and Woody Plants: Sweet Thorn Overview

This section covers identification, practical material properties, and conservation cautions for prominent woody Karoo species.

Sweet thorn (Vachellia karroo) is one of the region's most widespread woody trees, valued for hard timber, fuel, and forage, while requiring caution due to its defensive thorns.

Sweet Thorn (Vachellia karroo) Field Profile

Identification: A thorn tree characterized by paired straight white spines, feathery twice-compound leaves, round golden flower heads, and dark curved pods. The bark matures to become dark and rough.

Habitat and Season: Grows in dry riverbeds, drainage lines, old fields, and around water points. Timber is available year-round, with flowering occurring in spring and summer.

Documented Uses: Yields hard wood suitable for durable stakes, tool handles, and high-quality fuel. The gum has documented food and traditional uses when correctly sourced.

Karee (Searsia lancea) Field Profile

Identification: Karee (Searsia lancea) is an evergreen tree featuring narrow, leathery three-part leaves, gray-brown bark, and clusters of small yellow-brown fruits.

Habitat and Season: Found along dry watercourses, rocky slopes, and farm margins. Foliage and wood are present year-round.

Documented Uses: Provides tough wood for handles, pegs, and fuel. Its dense canopy offers valuable shade and wind reduction.

Trees and Woody Plants: Wild Olive Overview

Identification guidance, practical material properties, and conservation cautions for the wild olive tree (Olea europaea subsp. africana).

Wild olive is an exceptionally hardy, slow-growing Karoo tree prized for its dense, durable wood and crucial role in regional soil retention and wildlife habitat.

Identify: Toxic Iris-Like Corm

This iris-like plant features narrow sword leaves, an underground corm, and yellow to cream three-part flowers with patterned inner segments.

• Habitat & Season: Open veld, overgrazed ground, and seasonally moist flats. Flowers appear in spring following rain.
• Documented Use: No food use. Always verify identification before digging any corm or collecting onion-like leaves.
• Look-Alikes: Edible bulbs and wild onions differ in flower structure and odor; expert identification is mandatory.

Identify: Krimpsiekte Plant (Tylecodon wallichii)

The krimpsiekte plant (Tylecodon wallichii) is a toxic succulent shrub featuring thick, knobbly stems, peeling bark, seasonal fleshy leaves, and tall flower stalks.

• Habitat & Season: Rocky Karoo slopes and dry shrubland. Leaves are present mainly during the cool, wet season.
• Documented Use: No food or medicinal use.
• Look-Alikes: Some Cotyledon and Crassula species look similar; treat all unknown thick-leaved succulents as unsafe.

Toxic Plants to Avoid

High-consequence species must be recognized before any foraging or gathering begins.

Identify: Pig's Ear / Plakkie (Cotyledon orbiculata)

Pig's Ear or Plakkie (Cotyledon orbiculata) is a succulent shrub characterized by opposite, thick, rounded gray-green leaves often edged in red, and drooping orange-red tubular flowers.

• Habitat & Season: Rocky slopes and dry thicket, including parts of the Karoo. Foliage persists year-round.
• Documented Use: No food use. Although published traditional external uses exist, this guide treats the plant strictly as toxic.
• Look-Alikes: Spekboom leaves are much smaller on red stems, whereas Cotyledon leaves are large, thick, and oppositely arranged.

Identify: Tree Tobacco (Nicotiana glauca)

Tree Tobacco (Nicotiana glauca) is an invasive tall shrub or small tree bearing smooth blue-green leaves and clusters of long yellow tubular flowers.

• Habitat & Season: Roadsides, dry riverbeds, disturbed farmland, and waste ground. Present most of the year in warm locations.
• Documented Use: No edible or medicinal use. Removal should follow local invasive-species guidance and requires wearing gloves.
• Look-Alikes: Related wild tobacco species may have sticky, hairy leaves and different flower shapes; none should be eaten.

Traditional-Use Plants: Bitter Aloe (Aloe ferox)

Published cultural or historical uses reflect ethnobotanical documentation rather than modern prescriptions or dosing advice.

Bitter Aloe (Aloe ferox) is recognized for documented traditional uses, but wild-harvested plants should be handled with caution and proper identification.

Wild Olive (Olea europaea subsp. africana)

The wild olive is a small evergreen tree characterized by opposite, narrow gray-green leaves with silvery scales on their undersides, tiny white flowers, and small purple-black drupes.

• Habitat and Season: Found on rocky slopes, kloofs, and sheltered drainage lines. Foliage persists year-round; fruiting periods vary.
• Documented Uses: Produces dense, hard wood traditionally used for pegs, tool handles, and small durable implements. The foliage provides valuable browse for wildlife.
• Look-Alikes: Karee features three distinct leaflets, whereas wild olive leaves are simple and arranged in opposite pairs.

Buffalo Thorn (Ziziphus mucronata)

The buffalo thorn is a woody tree or shrub featuring distinctive zigzag twigs armed with paired thorns—one straight and one hooked—along with glossy, three-veined leaves, small yellow-green flowers, and reddish-brown fruits.

• Habitat and Season: Inhabits dry river courses, thickets, and rocky slopes. Fruit matures from summer into autumn.
• Documented Uses: The hard, flexible wood is valued for tool handles and resilient pegs. Ripe fruits have documented edible and cultural applications.
• Look-Alikes: Other Ziziphus species differ primarily in fruit size and leaf pubescence.

Trees and Woody Plants Overview

This section covers field identification, practical material properties, and conservation guidelines for the hardy trees and woody shrubs of the Great Karoo.

Arid woody species provide vital ecosystem functions, offering critical wildlife browse, dense shade, and timber. Because desert trees grow slowly, harvesting must be approached with caution to prevent lasting damage to local stands.

Shepherd's Tree (Boscia albitrunca)

The shepherd's tree is an evergreen tree recognizable by its conspicuous pale trunk, small leathery leaves often clustered on short shoots, greenish flowers, and smooth yellow-brown fruits.

• Habitat and Season: Grows across open plains, dry savanna margins, and deep sandy soils throughout the broader Karoo region. Leaves are present year-round.
• Documented Uses: Renowned for casting dense, cooling shade in arid landscapes. It yields hard wood, and regional traditions document food uses for the roots and fruit.
• Look-Alikes: Young karee and other evergreen Karoo shrubs lack the stark pale trunk and tightly clustered leaf arrangements characteristic of the shepherd's tree.

Spekboom (Portulacaria afra)

Spekboom is a succulent shrub or small tree displaying reddish stems, small opposite round fleshy leaves, and clusters of tiny pink flowers that appear after good rainfall.

• Habitat and Season: Native to rocky slopes and succulent thicket communities, especially toward the eastern Great Karoo. Foliage persists year-round.
• Documented Uses: The fleshy leaves are documented as edible with a tart, refreshing flavor, offering moisture and mild acidity when eaten in small amounts. Pliable branches are useful for constructing light shade screens.
• Look-Alikes: The jade plant has larger, thicker leaves, while toxic Tylecodon species typically feature alternate leaves and thick, peeling stems.