Adenium swazicum
Summer impala lily
Adenium swazicum is a species endemic to Eswatini (Swaziland), Mozambique and northeastern South Africa, where it grows on rocky slopes and low-altitude savannas with a pronounced dry season. Unlike other species in the genus, it flowers in the height of the austral summer (December–March), earning it the common name 'summer impala lily'. Its deep pink to magenta flowers with a long tube and pale throat make it one of the most striking in the genus. The caudex is less pronounced than in other species, but its erect branches and vigorous flowering make it very popular in southern African succulent collections.
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Overview
| Category | Classification |
|---|---|
| Family | Apocynaceae |
| Genus | Adenium |
| Growth Habit | Erect shrubby succulent with a moderate basal caudex and branched stems reaching 30–80 cm; more shrubby in habit than other species in the genus. |
| Conservation Status | Least Concern (LC) — IUCN Red List |
| pH Target | 6.0–7.5 |
| Type | Sandy-gravelly, well-drained, low to moderate in organic matter |
Origin & Habitat
Morphology
Less voluminous than that of A. obesum; basal, with smooth grey-whitish bark. Its primary function is water storage to survive the dry season. In pot-grown plants it can be fully exposed above the soil.
ecoObovate to spatulate, 5–10 cm long by 2–3 cm wide; bright mid-green with a pronounced midrib. They shed during the dry season and reappear with the rains.
ecoTubular with spreading limb, 5–7 cm in diameter; deep pink to intense magenta with a cream-pink throat. The tube is relatively long (2–3 cm) and flowering occurs simultaneously with the foliage.
ecoPair of fusiform follicles 8–14 cm long that split open at maturity, releasing seeds equipped with silky hair tufts for anemochorous dispersal.
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Requirements
Soil & Substrate
Type
Sandy-gravelly, well-drained, low to moderate in organic matter
groups Beneficial Associations
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Propagation Strategy
- 1 Collect fresh seeds at the start of follicle opening for maximum viability.
- 2 Soak seeds in warm water (30 °C) for 2–4 hours before sowing.
- 3 Sow 2 mm deep in sterile sandy substrate; maintain at 28–32 °C.
- 4 Germination occurs in 5–10 days under optimal heat and humidity conditions.
- 5 Transplant to individual pots when roots reach the edges of the germination tray.
- 1 Select a robust A. obesum rootstock with a stem 1–2 cm in diameter.
- 2 Make a clean wedge cut in both rootstock and scion.
- 3 Align cambial surfaces and secure with grafting tape.
- 4 Maintain at 28–32 °C in a humid environment until full union (2–3 weeks).
- 5 Remove tape and gradually expose to direct sun.
Take advantage of its summer flowering to complement collections where A. obesum has already finished blooming in spring.
Confusing the dormancy period: in the northern hemisphere, this species' dormancy corresponds to boreal winter, same as the rest of the genus.
Every 2–3 years at the start of spring, when growth resumes.
Balanced fertilizer (NPK 10-10-10) every 3 weeks during flowering; potassium-rich fertilizer (NPK 5-10-15) at the end of summer to harden tissues before dormancy.
Uses & Applications
Precautions / Toxicity
IMPORTANT: Adenium swazicum contains cardiac glycosides (cardenolides) highly toxic to humans and animals. Ingestion of any part can be fatal. Its milky sap irritates skin and eyes. Keep away from children and pets.
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Plant Health
Crown rot by Fusarium oxysporum: favoured by overwatering and high humidity. Signs: brown-black stain at the stem base. Treat with systemic fungicide and improve drainage.
Thrips (Frankliniella occidentalis): damages flowers and tender shoots causing deformations. Treatment: systemic insecticide or potassium soap with neem oil.
Armored scale (Diaspididae): forms protective plaques on stems and branches. Control: remove manually with an alcohol swab or apply paraffin oil.
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"Ideal for introducing the Adenium genus to collectors seeking summer flowering; its cycle inverse to that of A. obesum (flowering in summer rather than spring) allows ornamental interest to be staggered in a mixed collection."
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Scientific Integrity
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Sources
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Discussion
Disclaimer
This species record is provided for educational and informational purposes only. Jardín Roca Negra does not guarantee the accuracy or completeness of the data. Content is community-curated and may be subject to revision; it should not replace advice from a qualified botanist. This species may be toxic, invasive, or subject to legal restrictions — verify before handling or cultivating. Jardín Roca Negra accepts no liability for any harm arising from reliance on this information. Images are reproduced under Creative Commons or equivalent free licenses; credits are noted below each image.