Black Gem Alworthia (Alworthia 'Black Gem')

Black Gem Alworthia

Alworthia 'Black Gem'

Fleshy dark-tipped leaves hold desert quietude. Compact succulent hybrid; common name: Black Gem Alworthia.

Partial sun
1/week
Beginner
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Plant Needs

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Sunlight Bright indirect light to 4–6 hours of direct morning sun; avoid harsh midday summer sun to prevent leaf scorching
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Watering Water thoroughly only when the entire soil medium is completely dry; avoid standing water to prevent root rot
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Temperature Thrives at 15–25°C; tolerate brief drops to 10°C, but avoid frost and prolonged cold below 8°C
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Characteristics

  • Leaf: Triangular fleshy leaves with dark brown to black tips, arranged in dense rosettes; edges have small white tubercles
  • Flower: Tubular pale pink to orange blooms on thin, upright flowering stalks
  • Stem: Short, non-woody stem mostly concealed by rosette foliage
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Care Guide

Watering

Water when soil is fully dry, approximately every 7–10 days

Fertilization

Diluted succulent fertilizer once monthly. Use a balanced, low-nitrogen succulent fertilizer diluted to half strength

Eggshell powder topdress:Grind dried, rinsed eggshells to a fine powder; sprinkle a thin layer on soil surface to boost calcium levels without risking root burn
Pruning
  • Remove dried, dead leaves from the rosette base to improve airflow and reduce pest habitat
  • Trim spent flower stalks at the base after blooming to conserve the plant's energy
  • Divide overcrowded clumps in early spring for propagation, ensuring each division has healthy roots
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Mildly toxic; may cause vomiting, diarrhea, and lethargy if ingested

Humans: Ingestion of large amounts may cause mild gastrointestinal upset due to anthraquinone compounds

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental succulent for indoor dish gardens, windowsill displays, or outdoor rock gardens