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Senna occidentalis
Coffee Senna
Senna occidentalis
Senna occidentalis, commonly known as Coffee Senna or Coffeeweed, is an annual or short-lived herbaceous perennial belonging to the pea family (Fabaceae). It typically grows to a height of 0.5 to 2 meters, characterized by branched stems and pinnately compound leaves with 4-7 pairs of ovate to lanceolate leaflets. It produces distinct yellow, pea-like flowers in clusters, followed by slender, slightly flattened pods, 7-12 cm long, containing numerous seeds. While its seeds superficially resemble coffee beans, they are toxic if consumed. The plant is often found in disturbed areas, pastures, and agricultural fields in tropical and subtropical regions. It has a history of traditional medicinal use in various cultures.
CategoryDetails
Invasive StatusInvasive Status
Plant TypePerennial plant
Medicinal UsageMedicinal Usage
Estimated Plant Lifespan2 years lifespan
Toxic to humansToxic to humans
ToxicityToxic to: Cattle, Horses, Poultry, Sheep, Goats
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: animal

Notes: Primarily pollinated by various insect species, particularly bees. Self-pollination can also occur.

Watering Requirements

Method: top water

Frequency: When the top few centimeters of soil feel dry to the touch.

Notes: While tolerant of some drought once established, Senna occidentalis prefers consistently moist soil. Avoid prolonged waterlogging, which can lead to root issues.

Humidity Requirements

Level: moderate

Maintenance: Generally adapts to ambient humidity levels in its preferred warm, tropical to subtropical climates. No specific humidity maintenance is typically required unless grown in very arid indoor conditions.

Care InstructionsTo manage spread in areas where it is undesirable, remove spent flowers to prevent prolific self-seeding. Pruning can be done to maintain a desired shape and promote bushier growth. In colder climates, it will die back with frost and may need to be re-seeded annually.
Temperature Range

Min: 10°C

Max: 35°C

Alternative Namessepticweed, Mogdad coffee, negro-coffee, coffeeweed, senna coffee, stinkingweed, Stephanie coffee, styptic weed, قهوة سنا, Bana Chakunda, Cassia occidentalis, Cassia laevigata, Negro Coffee, Stinking Weed
Zea mays
Maize
Zea mays
As a legume, Senna occidentalis can fix atmospheric nitrogen, potentially enriching the soil with this essential nutrient. Corn is a heavy nitrogen feeder and could benefit from the increased nitrogen availability, fostering healthier growth without direct competition for space or light due to differing heights.
Amaranthus retroflexus
Redroot Amaranth
Amaranthus retroflexus

Redroot Pigweed is a robust annual weed that thrives in similar disturbed, sunny conditions. It competes aggressively for light, water, and soil nutrients, potentially stunting the growth of Senna occidentalis.

Sida rhombifolia
Cuban jute
Sida rhombifolia

Arrowleaf Sida is another common herbaceous weed that can grow in similar habitats and compete for resources such as light, water, and nutrients, especially in disturbed soils where Senna occidentalis is also prevalent.

Spider Mites

Tiny arachnids that feed on plant sap, causing yellowing, stippling, and fine webbing on the undersides of leaves. Severe infestations can lead to leaf drop and stunted growth.

Aphids

Small, soft-bodied insects that cluster on new growth and the undersides of leaves, sucking plant sap. Infested plants may exhibit distorted, curled leaves, stunted growth, and sticky honeydew which can lead to sooty mold.

Powdery Mildew

A fungal disease appearing as white, powdery patches on the surface of leaves, stems, and sometimes flowers. It can inhibit photosynthesis, leading to yellowing, distortion, and premature leaf drop, weakening the plant.

Steps:

    • To improve germination, scarify the hard seed coat by lightly rubbing seeds with sandpaper or soaking them in warm water for 12-24 hours prior to planting.
    • Sow seeds about 1-2 cm (0.5-0.75 inches) deep in well-draining potting mix or directly into prepared garden soil.
    • Maintain consistent moisture in the soil, but avoid waterlogging. Keep the soil warm, ideally between 20-30°C (68-86°F), to encourage germination.
    • Germination typically occurs within 7-14 days. Once seedlings are large enough and all danger of frost has passed, transplant them to their final desired location if started indoors.

Neem Oil Spray

A natural insecticide and fungicide effective against common pests like spider mites and aphids, and can help manage powdery mildew.

Diatomaceous Earth (Food Grade)

A natural, non-toxic powder that can be sprinkled around the base of plants to deter crawling insects and some slugs by dehydrating their exoskeletons.

Compost Tea

A liquid fertilizer rich in beneficial microorganisms that can improve soil health, nutrient uptake, and enhance the plant's natural resistance to pests and diseases.