A very small genus of annual or short-lived perennial plants, oncosiphon are native to southern Africa. The defining characteristic of these flowering plants is a somewhat swollen corolla tube, which gives the genus its Latin name Oncosiphon. The name is derived from the Greek words oncos ("thick," "swollen") and siphon ("tube"). Their common name—cape stinkweeds—refers to their unpleasant odor.
Water:
Oncosiphon thrives in periodic rainfall, preferring moderate hydration. It requires weekly watering to maintain vitality and exhibits resilience through moisture retention and drought tolerance. Adaptable to various climates, oncosiphon maximizes water uptake during peak growth phases and is commonly cultivated outdoors.
Propagation:
Propagation of oncosiphon primarily involves seed sowing and division. Success demands well-draining soil, moderate light, and temperatures of 15-25°C. Key steps include scarifying seeds, maintaining moisture for germination, and dividing clumps in early spring for replanting.
Get tips and tricks for your plants.
Keep your plants happy and healthy with our guide to watering, lighting, feeding and more.